JP2007106971A - Corrosion-resistant polyarylene sulfide composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polyarylene sulfide composition which controls metal corrosion of a molding machine occurring in molding and processing of extrusion molding, injection molding, etc., controls metal corrosion in a molding combined with a metal material, controls deposits (tar) occurring in a mold, etc., during molding and processing and controls a smell. <P>SOLUTION: The polyarylene sulfide composition is obtained by mixing a polyarylene with at least one kind of a basic metal silicate obtained by heating calcium hydroxide, magnesium hydroxide or calcium hydroxide and magnesium hydroxide with amorphous silicate in water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polyarylene sulfide composition having excellent metal corrosion resistance and mold contamination resistance. More specifically, suppression of metal corrosion of molding machines that occurs during molding processes such as extrusion molding and injection molding, suppression of metal corrosion in molded products that combine metal materials, and attachments that occur in molds during molding processes, etc. The present invention relates to a polyarylene sulfide composition which is excellent in suppressing kimono (cracking) and odor.

  Since polyarylene sulfide is excellent in mechanical properties, heat resistance, chemical resistance, flame retardancy, etc., it is used in a wide range of fields such as electrical / electronic equipment component materials and automobile component materials. However, since the resin generates corrosive gas such as sulfurous acid gas during molding, corrosion of metal surfaces such as screws, cylinders, molds, etc. of molding machines during molding, or corrosion of inserted metal parts, Furthermore, there is a problem that the decomposition product of the resin adheres to the mold during the molding process, and the following techniques have already been disclosed in order to solve them.

(1) Periodic Table Group IIA metal hydroxide, Group IIA metal oxide, Periodic Table Group IA metal aromatic carboxylate and Periodic Table Group IIA metal aromatic on polyarylene thioether A technique for preventing corrosion of molding equipment by a method of adding at least one carboxylate (Patent Document 1).

(2) A technique for improving thermal stability, suppressing metal corrosive gas, and preventing mold contamination by a method of adding perchlorate ion-type hydrotalcite to polyarylene sulfide resin (Patent Document 2).

(3) A compound product containing elements of Group IIA and Group IIB of the periodic table in polyarylene sulfide, and mixed with A4 type ultrapure water defined in JIS K0557, 10.0-12. A technique for reducing the generation of corrosive gas and dust by a method of adding a material exhibiting a pH of 0 (Patent Document 3). In this technique, there is a description of magnesium silicate (2MgO.6SiO ₂ .XH ₂ O) as a compound containing a Group IIA metal of the periodic table, but the magnesium silicate used in this technique is SiO ₂ / MgO. Is a compound different from the basic metal silicate used in the present invention to be described later.

(4) Metal corrosivity is reduced by a method of adding a fibrous filler and / or an inorganic filler and a monovalent, divalent, or trivalent metal silicate to a polyarylene sulfide resin (Patent Document 4). Technology. The art describes Ca and Mg as the metal of the metal silicate, but these metal silicates used in the art have a molar ratio of M ^II O to SiO ₂ of 15 to 85 mol%. : It is a metal silicate which is 85-15 mol% and is obtained by reaction of silicate aqueous solution and metal salt aqueous solution, and is a compound different from the basic metal silicate used by this invention.

Japanese Patent Laid-Open No. 62-109850 JP-A-4-218531 JP 2000-265060 A Japanese Patent Laid-Open No. 5-186689

  The polyarylene sulfide includes a Group IIA metal hydroxide, a Group IIA metal oxide, a Group IA aromatic carboxylate and a periodic table described in Patent Document 1 above. Table IIA Metal Aromatic Carboxylate Technology, Perchlorate Ion-Type Hydrotalcite Technology described in Patent Document 2, and Periodic Table of Patent Document 3 A technique of adding a compound containing an element of Group IIA and Group IIB and a fibrous filler and / or an inorganic filler described in Patent Document 4 and a monovalent, divalent, and trivalent metal silicate The technology to be added is sufficient to suppress the corrosion of metal surfaces such as molds of molding machines or to suppress the corrosion of metal materials in molded products, to suppress deposits generated on molds, etc., and to suppress odors during molding. But not these Providing polyarylene sulfide composition having excellent performance is awaited.

  From the above viewpoints, the present inventors, when molding polyarylene sulfide, suppresses corrosion of metal surfaces such as molds of molding machines or corrosion of metal materials in molded products, and decomposes polyarylene sulfide during molding processing. As a result of intensive research on a composition excellent in suppressing adhesion to molds and the like and suppressing odor during molding, a base having a specific structure manufactured by a specific manufacturing method with respect to 100 parts by mass of polyarylene sulfide The present inventors have found that a polyarylene sulfide composition capable of solving the above-described problems can be obtained by adding a specific amount of a functional metal silicate salt.

That is, the present invention provides the following polyarylene sulfide composition.
[1] For 100 parts by mass of polyarylene sulfide,
A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition obtained by adding 0.01 to 10 parts by mass of at least one selected from the group consisting of basic metal silicates represented by the formula:
[2] The polyarylene sulfide composition according to the above [1], wherein n in the general formula (1) is a value in the range of 0.02 to 0.15.
[3] The polyarylene sulfide composition according to the above [1] or [2], wherein the polyarylene sulfide is polyphenylene sulfide.

  Compared with the prior art, the polyarylene sulfide composition of the present invention suppresses corrosion of metal surfaces such as molds of molding machines, inhibits corrosion of metal materials in molded products, and molds such as decomposition products of polyarylene sulfides. It is extremely excellent in suppressing adhesion to odor and suppressing odor during molding.

  The polyarylene sulfide composition of the present invention comprises a basic metal silicate represented by the general formula (1) and a basic metal silicate represented by the general formula (2) with respect to 100 parts by mass of the polyarylene sulfide. 0.01 to 10 parts by mass of at least one selected from the group consisting of salts is added. Hereinafter, the polyarylene sulfide used in the present invention and the basic metal silicate represented by the general formula (1) or (2) will be described in detail.

1. Polyarylene sulfide The polyarylene sulfide used in the present invention has a repeating unit represented by the general formula (3)
-(Ar-S)-(3)
[In the formula (3), Ar represents an arylene group, and S represents sulfur. ] It is a polymer shown by this. When the repeating unit (Ar-S) is defined as 1 mol (basic mol), the polyarylene sulfide used in the present invention has this repeating unit of usually 50 mol% or more, preferably 70 mol% or more, more preferably 90 mol%. A polymer containing at least mol%.

  As the arylene group, p-phenylene, m-phenylene, o-phenylene, alkyl-substituted phenylene (preferably an alkyl group having 1 to 6 carbon atoms), phenyl-substituted phenylene, halogen-substituted phenylene, amino-substituted phenylene, amide-substituted phenylene Divalent aromatic residues containing at least one benzene ring such as p, p'-diphenylenesulfone, p, p'-biphenylene, p, p'-biphenylene ether, p, p'-biphenylenecarbonyl and naphthalene Can be mentioned. Examples of the polyarylene sulfide composed of these arylene groups include a homopolymer composed of the same repeating unit, a copolymer composed of two or more different arylene groups, and a mixture thereof.

  Among these polyarylene sulfides, polyphenylene sulfide having p-phenylene sulfide as the main constituent element of the repeating unit is particularly preferable because of its excellent processability and industrial availability. In addition, polyarylene ketone sulfide, polyarylene ketone ketone sulfide, and the like can be used. Specific examples of the copolymer include a random or block copolymer having a repeating unit of p-phenylene sulfide and a repeating unit of m-phenylene sulfide, a random or block copolymer having a repeating unit of phenylene sulfide and a repeating unit of arylene ketone sulfide, and phenylene sulfide. And a random or block copolymer having a repeating unit of arylene ketone ketone sulfide and a random or block copolymer having a repeating unit of phenylene sulfide and a repeating unit of arylene sulfone sulfide. These polyarylene sulfides are preferably crystalline polymers.

  Polyarylene sulfide can be obtained by a known method in which an alkali metal sulfide and a dihalogen-substituted aromatic compound are subjected to a polymerization reaction in a polar solvent. Examples of the alkali metal sulfide include lithium sulfide, sodium sulfide, potassium sulfide, rubidium sulfide, cesium sulfide and the like. Sodium sulfide produced by reacting sodium hydrosulfide and sodium hydroxide in the reaction system can also be used. Examples of the dihalogen-substituted aromatic compound include p-dichlorobenzene, m-dichlorobenzene, 2,5-dichlorotoluene, p-dibromobenzene, 2,6-dichloronaphthalene, 1-methoxy-2,5-dichlorobenzene, 4,4'-dichlorobiphenyl, 3,5-dichlorobenzoic acid, p, p'-dichlorodiphenyl ether, 4,4'-dichlorophenyl sulfone, 4,4'-dichlorodiphenyl sulfoxide, 4,4'-dichlorodiphenyl ketone, etc. Can be mentioned. These can be used alone or in combination of two or more.

  In order to introduce some branched structure or crosslinked structure into the polyarylene sulfide, a polyhalogen-substituted aromatic compound having 3 to 6 halogen substituents per molecule can be used in combination. Examples of the polyhalogen-substituted aromatic compound include 1,2,3-trichlorobenzene, 1,2,3-tribromobenzene, 1,2,4-trichlorobenzene, 1,2,4-tribromobenzene, 1 , 3,5-trichlorobenzene, 1,3,5-tribromobenzene, 1,3-dichloro-5-bromobenzene and the like, and alkyl substituted products thereof. These can be used alone or in combination of two or more. Among these, 1,2,4-trichlorobenzene, 1,3,5-trichlorobenzene, and 1,2,3-trichlorobenzene are preferable from the viewpoints of economy, reactivity, physical properties, and the like.

  Examples of the polar solvent include aromatic organic amide solvents such as N-alkylpyrrolidone such as N-methyl-2-pyrrolidone, 1,3-dialkyl-2-imidazolidinone, tetraalkylurea, hexaalkylphosphoric triamide and the like. The reaction system is highly stable, and a high molecular weight polymer is easily obtained. In the present invention, substantially linear polyarylene sulfide is preferable, and polyarylene sulfide subjected to various washing operations and heat treatment after polymerization can also be used.

2. Basic Silicic Acid Metal Salt The basic silicic acid metal salt represented by the following general formula (1) used in the present invention (hereinafter sometimes referred to as basic silicic acid metal salt (1)) is calcium hydroxide or Manufactured by heating magnesium hydroxide and amorphous silicic acid in water.
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
The basic metal silicate represented by the general formula (1) is basic calcium silicate or basic magnesium silicate.

The basic silicate metal salt represented by the following general formula (2) used in the present invention (hereinafter sometimes referred to as the basic silicate metal salt (2)) is amorphous with calcium hydroxide and magnesium hydroxide. It is manufactured by heating quality silicic acid in water.
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
The basic metal silicate represented by the general formula (2) is basic calcium magnesium silicate.

  These basic metal silicates represented by the general formula (1) and the general formula (2) can be used in combination of two or more. Compared to the basic use of basic calcium silicate or basic magnesium silicate, it is preferable that the basic metal salt of silicate contains both calcium and magnesium metals. Examples of such include the combined use of basic calcium silicate and basic magnesium silicate represented by the above general formula (1), and the use of basic calcium magnesium silicate represented by the above general formula (2). Furthermore, the basic calcium magnesium silicate represented by the general formula (2) and the basic calcium silicate or basic magnesium silicate represented by the general formula (1) can be used in combination.

  In the case of the basic metal silicate represented by the general formula (2), the molar ratio of calcium / magnesium, that is, s / t is preferably in the range of 5/95 to 95/5. The basic calcium magnesium silicate represented by the general formula (2) has a calcium / magnesium hydroxide molar ratio of 5/95 to 95/5, and calcium hydroxide and magnesium hydroxide. It is preferable that amorphous silicic acid is obtained by reacting in the range of 0.02 to 0.30 mol with respect to 1 mol in total.

In general formula (1) and general formula (2), n and m show the molar ratios of SiO ₂ / MO and SiO ₂ / (M ¹ O + M ² O), respectively, and range from 0.02 to 0.30. Value. In particular, when n and m are 0.02 to 0.15, the effect of suppressing corrosion of metal surfaces such as molds, suppressing deposits generated on the molds and the like and suppressing odor during molding processing is extremely excellent. Yes. When n and m exceed 0.30, corrosion of metal surfaces such as molds and the like, and the effects of suppressing deposits generated on the molds and odors during molding are reduced, and n and m are 0.02 In the case of less than the above, it is not possible to obtain the effect of suppressing corrosion of a metal surface such as a mold, suppressing deposits generated on the mold or the like, and suppressing odor during molding.

  The basic metal silicate (1) used in the present invention is calcium hydroxide or magnesium hydroxide and amorphous silicic acid, and the basic metal silicate (2) is calcium hydroxide and magnesium hydroxide. And obtained by heating amorphous silicic acid in water.

  Specifically, the basic silicate metal salts (1) and (2) used in the present invention are added in an amount of 0.001 per 1 mol of calcium hydroxide or magnesium hydroxide, or 1 mol of the total of calcium hydroxide and magnesium hydroxide. 02 to 0.30 mol, preferably 0.02 to 0.15 mol of amorphous silicic acid is mixed in water and the mixture is reacted at a temperature of 50 to 100 ° C., preferably 80 to 98 ° C. The resulting slurry is obtained by evaporating to dryness.

  The basic metal silicate obtained by the above-mentioned production method is extremely excellent in suppressing corrosion of metal surfaces such as molds, suppressing deposits generated on the molds, and odors during molding.

  As the calcium hydroxide used as a raw material, any of the special Nos. 1, 2 and 2 of industrial lime (JIS R 9001) can be used. It is not limited to this, The thing for other uses, for example, slaked lime for plasterers, can also be used. As the magnesium hydroxide, natural or synthetic magnesium hydroxide can be used.

As amorphous silicic acid, use white carbon, other wet method amorphous silica (precipitation method silica or gel method silica), and amorphous silica obtained by acid treatment of smectite group viscosity mineral. Can do. The amorphous silica generally has a BET specific surface area of 150 to 400 m ² / g and a secondary particle size in the range of 1 to 10 μm.

The basic metal silicates (1) and (2) used in the present invention may contain water or hydrated water (water existing as a hydroxyl group). When hydration water is included, MO (M is Ca or Mg) in the general formula ( ¹ ) or M ¹ O (M ¹ is Ca) or M ² O (M ² is Mg in the general formula (2)) ) Exists partially as hydroxide. Thus, even when water or hydration water is contained, the basic metal silicate used in the present invention has a composition of the general formula (1) or the general formula (2).

The following are mentioned as a specific manufacturing method of each basic silicate metal salt.
1. In order to obtain basic calcium silicate, calcium hydroxide and white carbon are used, and amorphous silicic acid is in the range of 0.02 to 0.30, preferably 0.02 to 0.000, per mol of calcium hydroxide. In the range of 15, the reaction is carried out in water at a reaction temperature of 50-100 ° C, preferably 80-98 ° C.
2. In order to obtain basic magnesium silicate, magnesium hydroxide and white carbon are used, and amorphous silicic acid is in the range of 0.02 to 0.30, preferably 0.02 to 0.000 per mol of magnesium hydroxide. In the range of 15, the reaction is carried out in water at a reaction temperature of 50-100 ° C, preferably 80-98 ° C.
3. To obtain basic calcium magnesium silicate, calcium hydroxide and magnesium hydroxide and white carbon are used. Amorphous silicic acid 0.02 to 0.30 is added to 1 mol of calcium hydroxide and magnesium hydroxide in total. The reaction is carried out in water at a reaction temperature of 50 to 100 ° C., preferably 80 to 98 ° C., preferably 0.02 to 0.15.

  The basic metal silicate obtained by this method is used to suppress the corrosion of metal surfaces such as molds of molding machines, the corrosion of metal materials in molded products, and the adhesion of polyarylene sulfide decomposition products to molds. In addition, it is extremely excellent in suppressing odor during molding.

In a manufacturing method other than this manufacturing method, for example, a metal silicate obtained by a method of reacting a water-soluble silicate and a water-soluble metal salt in the presence of water as described in Patent Document 4, the general formula Even if the SiO ₂ / MO in (1) or the SiO ₂ / (M ¹ O + M ² O) in the general formula (2) is a metal silicate having a molar ratio exceeding 0.30, it is defined in the present invention. Thus, even with a basic silicate in the range of 0.02 to 0.30, the effect of inhibiting corrosion of metal surfaces such as molds of molding machines, the effect of inhibiting corrosion of metal materials in molded products, and polyarylene The effect of suppressing the adhesion of sulfide decomposition products to the mold and the effect of suppressing odor during the molding process cannot be obtained.

  Also, a simple mixture of calcium hydroxide or calcium oxide and silicic acid, or magnesium hydroxide or magnesium oxide and silicic acid so as to have the composition of the above general formula (1) or general formula (2) is added. Even so, the effect of inhibiting the corrosion of the metal material as obtained by the polyarylene sulfide composition of the present invention is not obtained at all. Furthermore, a metal silicate other than the basic metal silicate used in the present invention is converted into calcium hydroxide or calcium oxide, or magnesium hydroxide or magnesium oxide and the composition of the general formula (1) or general formula (2). Even if they are simply mixed, effects such as corrosion inhibition of the metal material as obtained with the polyarylene sulfide composition of the present invention cannot be obtained.

  The basic silicic acid metal salts (1) and (2) used in the present invention are higher fatty acid, higher fatty acid ammonium salt, higher fatty acid alkali metal salt such as alkali metal salt such as stearic acid and oleic acid, organic sulfonic acid And may be surface-treated with an organic sulfonic acid alkali metal salt such as an alkali metal salt such as dodecylbenzenesulfonic acid. The surface-treated basic metal silicates (1) and (2) used in the present invention have high mechanical strength because the dispersibility of the compound is improved compared to the compound not subjected to surface treatment. A molded product is obtained.

In the present invention, the amount of the basic metal silicate (1) or (2) added to the polyarylene sulfide is in the range of 0.01 to 10 parts by mass, preferably 0.00. 1 to 5 parts by mass. When the basic metal silicates (1) and (2) are used in combination, the total amount is in the range of 0.01 to 10 parts by mass with respect to 100 parts by mass of the polyarylene sulfide, preferably 0.8. 1 to 5 parts by mass.
When the amount added is less than 0.01 parts by mass, the suppression of metal corrosion, the suppression of mold adhesion, and the suppression of odor at the time of molding processing are insufficient. There is no improvement in suppression and odor suppression during molding.

3. Optional Addition Components In the polyarylene sulfide composition of the present invention, other resins may be blended and used as long as the effects of the present invention are not impaired. The resin that can be blended is not particularly limited, and specific examples thereof include nylon 6, nylon 66, nylon 610, nylon 11, nylon 12, and polyamides such as aromatic nylon, polyethylene terephthalate, polybutylene terephthalate, and polycyclohexyl. Polyester resins such as dimethylene terephthalate and polynaphthalene terephthalate, polysulfone, polyphenylene oxide, polycarbonate, polyethersulfone, polyetherimide, cyclic olefin copolymer, polyethylene, polypropylene, polytetrafluoroethylene, carboxyl group, carboxylic acid ester group, acid anhydride Olefin-based copolymers, polyolefin-based elastomers, polyether ester elastomers having functional groups such as physical groups or epoxy groups Chromatography, polyetheramide elastomers, polyamide-imide, polyacetal, and polyimide.

  In the polyarylene sulfide composition of the present invention, a filler can be blended and used for the purpose of expressing more excellent strength and dimensional stability. Specific examples of the filler include glass fiber, carbon fiber, potassium titanate whisker, zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone-kow fiber, metal fiber, etc. Fibrous fillers, plate fillers such as glass flakes and mica, wollastonite, zeolite, sericite, talc, kaolin, clay, pyrophyllite, bentonite, asbestos and alumina silicates such as alumina silicate, silicon oxide, magnesium oxide , Metal compounds such as alumina, zirconium oxide, titanium oxide and iron oxide, carbonates such as calcium carbonate and magnesium carbonate, sulfates such as calcium sulfate and barium sulfate, water such as calcium hydroxide, magnesium hydroxide and aluminum hydroxide Oxide, glass beads, Non-fibrous fillers such as ceramic beads, boron nitride, silicon carbide, graphite, carbon black and silica may be mentioned. These may be hollow, and two or more of these fillers can be used in combination. is there. In addition, using these fillers by pretreatment with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound, and an epoxy compound can provide better mechanical strength. Preferred in meaning. Of these, glass fibers and carbonates such as calcium carbonate and magnesium carbonate are particularly preferable.

  The blending amount of the filler is 5 to 300 parts by mass, preferably 10 to 200 parts by mass with respect to 100 parts by mass of polyarylene sulfide, from the balance of excellent mechanical strength, dimensional stability and melt fluidity. is there.

  Further, in the present invention, in addition to the basic silicate metal salts (1) and (2), various additives such as a lubricant, an antistatic agent, an antioxidant, an ultraviolet absorber, a release agent, a colorant, and the like. Can be added in combination.

In carrying out the present invention, the following embodiments can be cited.
(1) A basic silicate metal salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyarylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
A polyarylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(2) Basic silicate metal salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(3) A basic metal silicate produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyarylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
A polyarylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(4) A basic silicate metal salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(5) A basic metal silicate salt produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyarylene sulfide, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:
(6) A basic metal silicate salt produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(7) A basic silicate metal salt produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, wherein the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1 and s / t is in the range of 5/95 to 95/5, and m is in the range of 0.02 to 0.30. Is the value of ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(8) A basic silicate metal salt produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, and having the general formula (2)
^{sM 1 O · tM 2 O ·} mSiO 2 (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(9) A basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, which is represented by the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1 and s / t is in the range of 5/95 to 95/5, and m is in the range of 0.02 to 0.15. Is the value of ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(10) A basic metal silicate produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyarylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition obtained by adding a total of 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(11) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyphenylene sulfide composition obtained by adding a total of 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(12) A basic metal silicate produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyarylene sulfide, and having the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ] The polyarylene sulfide composition formed by adding at least 0.01 to 10 parts by mass of at least one of the basic metal silicates represented by

(13) A basic silicate metal salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water with respect to 100 parts by mass of polyphenylene sulfide, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ]
A polyphenylene sulfide composition obtained by adding a total of 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula:

(14) For 100 parts by mass of polyarylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
A polyarylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(15) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula (B) and 5 to 300 parts by mass of a filler (B).

(16) For 100 parts by mass of polyarylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula (B) and 5 to 300 parts by mass of a filler (B).

(17) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by the formula (B) and 5 to 300 parts by mass of a filler (B).

(18) For 100 parts by mass of polyarylene sulfide,
(A) A basic metal salt of silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition obtained by adding 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and (B) 5 to 300 parts by mass of a filler.
(19) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal salt of silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(20) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal salt of silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1 and s / t is in the range of 5/95 to 95/5, and m is in the range of 0.02 to 0.30. Is the value of ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(21) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal salt of silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(22) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal salt of silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, and having the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1 and s / t is in the range of 5/95 to 95/5, and m is in the range of 0.02 to 0.15. Is the value of ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(23) For 100 parts by mass of polyarylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition comprising 0.01 to 10 parts by mass in total of at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of a filler (B).

(24) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyphenylene sulfide composition comprising 0.01 to 10 parts by mass in total of at least one basic silicate metal salt represented by formula (B) and (B) 5 to 300 parts by mass of a filler.

(25) For 100 parts by mass of polyarylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ]
A polyarylene sulfide composition obtained by adding 0.01 to 10 parts by mass in total with at least one basic silicate metal salt represented by formula (B) and 5 to 300 parts by mass of (B) a filler.

(26) For 100 parts by mass of polyphenylene sulfide,
(A) A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.15. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water. )
sM ¹ O · tM ² O · mSiO ₂ (2)
[In the formula (2), M ¹ represents Ca, M ² represents Mg, s + t = 1, and m is a value in the range of 0.02 to 0.15. ]
A polyphenylene sulfide composition obtained by adding 0.01 to 10 parts by mass in total with at least one basic silicate metal salt represented by formula (5) and 5 to 300 parts by mass of a filler (B).

  Preferred embodiments of the present invention include the above embodiments (2) to (9), (11) to (13), (15) to (22) and (24) to (26). Preferred embodiments include embodiments (6), (7), (8), (9), (19), (20), (21) and (22), and the most preferred embodiments Includes embodiments (8), (9), (21) and (22).

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, the said invention is not limited by these. In these examples, “part” means “part by mass”.
(Synthesis Example 1)
Calcium hydroxide [Ryoko Lime Kogyo Co., Ltd. special name fine powder, content: CaO conversion 74% by mass] 75.8 g (1 mol) and amorphous silicic acid [Shionogi Pharmaceutical Co., Ltd. Carplex # 80, content ; 95 mass% in terms of SiO ₂ ] 1.27 g (0.02 mol) was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. The slurry was transferred to a stainless steel vat, dried at 110 ° C. and pulverized by a sample mill to obtain basic calcium silicate (CaO · 0.02SiO ₂ ).

(Synthesis Examples 2 to 10)
Using the following raw materials, a basic metal silicate was synthesized under the same conditions as in Synthesis Example 1 while changing the molar ratio of calcium hydroxide, magnesium hydroxide and amorphous silicic acid.
Raw material used: Calcium hydroxide [Ryoko Lime Industry Co., Ltd., special name fine powder, content: CaO conversion 74% by mass]
Magnesium hydroxide [Kamishima Chemical Co., Ltd. # 200, content: 66% by mass in terms of MgO]
-Amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd., content: 95% by mass in terms of SiO ₂ ]
The results are shown in Table 1.

(Synthesis Example 11)
Calcium hydroxide [Special powder of Ryoko Lime Industry Co., Ltd., content; CaO conversion 74% by mass] 9.1 g (0.12 mol), Magnesium hydroxide [Kamijima Chemical Co., Ltd. # 200, content; MgO 66 mass% in terms of conversion] 53.7 g (0.88 mol) and amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd .; content: 95 mass% in terms of SiO ₂ ] 1.27 g (0.02 mol) Was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. The slurry was transferred to a stainless steel vat, dried at 110 ° C. and pulverized with a sample mill to obtain basic calcium magnesium silicate (0.12CaO · 0.88MgO · 0.02SiO ₂ ).

(Synthesis Examples 12 to 20)
Using the following raw materials, a basic metal silicate was synthesized under the same conditions as in Synthesis Example 11 while changing the molar ratio of calcium hydroxide, magnesium hydroxide and amorphous silicic acid. Raw material used: Calcium hydroxide [Ryoko Lime Industry Co., Ltd., special name fine powder, content: CaO conversion 74% by mass]
Magnesium hydroxide [Kamishima Chemical Co., Ltd. # 200, content: 66% by mass in terms of MgO]
-Amorphous silicic acid [Carplex # 80, manufactured by Shionogi Pharmaceutical Co., Ltd., content: 95% by mass in terms of SiO ₂ ]
The results are shown in Table 2.

(Synthesis Example 21)
Calcium hydroxide [Special powder of Ryokko Lime Industry Co., Ltd., content: 74% by mass in terms of CaO] 37.8 g (0.5 mol), Magnesium hydroxide [Kamijima Chemical Co., Ltd. # 200, content; MgO Convert 66 wt%] 30.4 g (0.5 mol) and the amorphous silicic acid [Shionogi & Co., Ltd. Carplex # 80, content; SiO ₂ in terms of 95 mass%] 7.6 g (0.12 mol) Was suspended in 400 ml of ion-exchanged water and reacted at 95 ° C. for 4 hours. Thereafter, 1.5 g of ammonium stearate was added, and the reaction was further continued at the same temperature for 30 minutes to complete the surface treatment. The slurry was transferred to a stainless steel vat, dried at 110 ° C., ground in a sample mill, and surface-treated with ammonium stearate (0.50CaO · 0.50MgO · 0.12SiO _2). )

(Synthesis Example 22)
Solution A was prepared by dissolving 147.0 g (1 mol) of calcium chloride dihydrate in 100 ml of ion-exchanged water. No. 1 sodium silicate [contents: 36.4 mass% in terms of SiO ₂ , 17.2 mass% in terms of Na ₂ O] 19.8 g (SiO ₂ ; 0.12 mol, Na ₂ O; 0.055 mol) in 100 ml of ion-exchanged water In addition, 75.6 g (1.89 mol) of sodium hydroxide was dissolved to prepare solution B. Both A and B liquids were mixed, and after reacting the mixed slurry at 40 ° C. for 2 hours, the slurry was filtered and washed with water. After drying at 110 ° C., the mixture was pulverized with a sample mill to obtain basic calcium silicate (CaO · 0.12SiO ₂ ).

(Synthesis Examples 23-25)
Using the following raw materials, basic metal silicates were synthesized under the same conditions as in Synthesis Example 22 while changing the molar ratio of calcium chloride, magnesium chloride, sodium silicate and sodium hydroxide. Raw materials used: calcium chloride dihydrate, magnesium chloride hexahydrate, No. 1 sodium silicate [content: 36.4% by weight in terms of SiO _2, 17.2% by weight in terms of Na ₂ O]
The results are shown in Table 3.

(Synthesis Example 26)
A solution A in which 100.0 g of No. 3 sodium silicate (SiO ₂ = 0.488 mol) was dissolved in 125.4 ml of ion-exchanged water was prepared. Liquid B was prepared by dissolving 37.92 g (0.152 mol) of copper sulfate pentahydrate and 0.8 g (0.02 mol) of sodium hydroxide in 31.35 ml of ion-exchanged water. The respective aqueous solutions were supplied to the overflow type reaction layer at a rate of 2.67 ml / minute for liquid A and 0.67 ml / minute for liquid B, and reacted with stirring. The temperature of the reaction solution slurry was kept at 40 ° C. The pH was 7.2. The slurry product after the reaction was filtered, washed with water until no sulfate ions were detected in the washing solution, and the obtained washing cake was dried at 100 ° C. to obtain copper silicate.

  Next, the basic silicate metal salts (hereinafter referred to as Group A) used in the present invention are summarized in Table 4, and the other silicate metal salt compounds (hereinafter referred to as Group B) are summarized in Table 5, respectively. .

(Synthesis Example 27)
Synthesis of polyphenylene sulfide A 15 L autoclave was charged with 5 L of N-methyl-2-pyrrolidone, heated to 120 ° C., then charged with 1866 g of Na ₂ S · 2.8H ₂ O, and gradually raised to 205 ° C. with stirring. Warm and distill off 407 g of water. After cooling the system to 140 ° C., 2080 g of p-dichlorobenzene was added. The temperature was raised to 225 ° C. and polymerized for 2 hours, then the temperature was raised to 250 ° C., and polymerization was further performed at 250 ° C. for 2 hours. After completion of the polymerization, the slurry cooled to room temperature is poured into a large amount of water to precipitate the polymer, filtered, repeatedly washed with pure water, and then heated and vacuum dried overnight to obtain a single polymer. Released. The melt viscosity of the obtained polyphenylene sulfide was 20 PaS. The polyphenylene sulfide thus obtained was further heat-cured at 235 ° C. in an air atmosphere to obtain a melt viscosity of 60 PaS.

[Examples 1 to 34 and Comparative Examples 1 to 30]
To 100 parts of the polyphenylene sulfide produced in Synthesis Example 27, the silicate metal salt compound shown in Table 6 was added in the proportion shown in Table 6, and the blended mixture was melt-kneaded using an extruder and pelletized. Got.
The obtained pellets were evaluated for metal corrosion resistance, mold contamination resistance and odor. The results are shown in Table 6.

(Metal corrosion resistance)
4 g of the obtained pellets and a nail were put into a test tube, put in a heating block set at 340 ° C., heated for 18 hours, and then taken out from the test tube. The nail deposits were removed, and the state of occurrence of rust on the nail after standing in a desiccator with a humidity of 80% for 3 days was visually determined. The state of occurrence of rust on the nail was determined according to the following criteria.
1: No rust is generated on the nail.
2: Some rust is slightly generated on the nail.
3: Less than 30% of rust is generated on the nail.
4: Rust is generated on the nail less than about 50%.
5: About 50% or more of rust is generated on the nail.
6: Rust is generated on the entire surface of the nail.

(Metal mold resistance)
4 g of the obtained pellet and the nail were put into a test tube, put in a heating block set at 340 ° C., heated for 18 hours, and the amount of deposits generated on the nail was visually determined. The amount of deposits generated on the nail was determined according to the following criteria.
a: No deposits are generated on the nail.
b: Slight deposits are generated on the nail.
c: Many deposits are generated on the nail.
d: Very many deposits are generated on the nail.

(Odor)
4 g of the obtained pellet was put into a test tube, put into a heating block set at 340 ° C., heated for 10 minutes, and then the odor in the test tube was judged by the following criteria by a sensory test of five panelists.
○: Only a slight odor can be felt.
Δ: Odor is somewhat uncomfortable. ×: Strong odor and unpleasant.

  As is apparent from the comparison of the results of Examples and Comparative Examples in Table 6, it can be seen that the polyphenylene sulfide composition of the present invention is excellent in metal corrosion resistance, mold contamination resistance and odor control. As in Examples 33 and 34, the basic metal silicate used in the present invention is not added to the basic metal silicate used in the present invention in combination with the other metal silicate compound. It can be seen that if the addition amount is within the range specified in, the metal corrosion resistance, mold contamination resistance and odor control are excellent. However, as in Comparative Examples 1 to 3, when the basic silicate metal salt compound defined in the present invention is added, the amount added is less than the range defined in the present invention, or Comparative Examples 4 to As can be seen from FIG. 6, even when the basic metal silicate salt used in the present invention is added, if the amount added is larger than the amount added in the range specified in the present invention, the effect is lowered.

  Further, when the composition of the basic metal silicate is outside the range specified by the present invention as in Comparative Examples 7 to 9, the present invention is applied even if the composition is within the range specified by the present invention as in Comparative Examples 10 to 13. In the case of a basic silicate metal salt produced by a production method other than the production method of the basic silicate metal salt used in Example 1, as in Comparative Examples 14 to 29, a silicate metal salt other than the basic silicate metal salt used in the present invention. When the compound is added and when the metal silicate salt is not added as in Comparative Example 30, sufficient metal corrosion resistance, mold contamination resistance and odor control effects cannot be obtained.

  Compared with the prior art, the polyarylene sulfide composition of the present invention suppresses corrosion of metal surfaces such as molds of molding machines, inhibits corrosion of metal materials in molded products, and molds such as decomposition products of polyarylene sulfides. It is extremely excellent in suppressing adhesion to water and suppressing odor during molding, and is very useful as a material in the field of polyarylene sulfide molded products.

Claims (3)

For 100 parts by mass of polyarylene sulfide,
A basic metal silicate salt produced by heating calcium hydroxide or magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (1)
MO.nSiO ₂ (1)
[In Formula (1), M shows Ca or Mg, and n is a value of the range of 0.02-0.30. ]
And a basic metal silicate produced by heating calcium hydroxide, magnesium hydroxide and amorphous silicic acid in water, wherein the general formula (2)
sM ¹ O · tM ² O · mSiO ₂ (2)
Wherein (2), ^{M 1} is Ca, ^{M 2} represents a Mg, a s + t = 1, m has a value ranging from 0.02 to 0.30. ]
A polyarylene sulfide composition obtained by adding 0.01 to 10 parts by mass of at least one selected from the group consisting of basic metal silicates represented by the formula:   The polyarylene sulfide composition according to claim 1, wherein n in the general formula (1) is a value in the range of 0.02 to 0.15.   The polyarylene sulfide composition according to claim 1 or 2, wherein the polyarylene sulfide is polyphenylene sulfide.