JPH07118496A - Polyacetal resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition excellent in heat resistance, antistaticity, etc., without impairing the mechanical strength and processability of the resin, by incorporating an antioxidant, each specific nitrogen-contg. compound and antistatic agent with a polyacetal resin. CONSTITUTION:The objective composition is obtained by incorporating (A) 100 pts.wt. of a polyacetal resin with (B) 0.01-5 pts.wt. of an antioxidant, (C) 0.001-5 pts.wt. of a nitrogen-contg. compound selected from melamines (derivatives), polyamides and polyacrylamide, and (D) 0.1-40 pts.wt. of an antistatic agent consisting of such a clathrate compound that (1) a basic carbonate or its anion exchanger of metals mainly comprising alkaline metal and Al of the formula [(x is 0.6-3; y is 0-3; z 7 is 0-2.4; y+z is not 0; (a) is 0-6; M is alkaline metal; R is alkaline-earth metal; A is anion; n is valency of A; m <=3] includes (2) polyalkylene polyols or polyalkylene polyols dissolved in an alkaline metal salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermally stabilized antistatic polyacetal resin composition suitable for use in an environment where dust, dirt and the like are likely to adhere.

[0002]

2. Description of the Related Art Polyacetal resins, which have excellent mechanical properties, thermal properties, long-term properties, friction and wear properties, moldability, etc., are engineering plastics used in the fields of automobiles, electrical and electronic products, etc. Widely used in. However, since the polyacetal resin has a high surface resistivity like many plastics, depending on the application, problems such as electrostatic noise, surface stains, and adhesion may occur due to charging. In order to improve such electrostatic damage, various antistatic agents have been conventionally used. Surfactants are generally used as antistatic agents and are effective for polyacetal resins, but anionic or cationic, amphoteric surfactants, which are ionic substances, discolor the polyacetal. And causes a decrease in thermal stability, which is not preferable. Nonionic surfactants are known as such substances with less adverse effects, but generally have a weak antistatic effect and require a large amount of addition in order to impart a practical level of charging characteristics. However, such a large amount of addition of a surfactant generally deteriorates the mechanical properties and molding processability of the molded product, and further causes bleeding on the surface of the molded product to impair the appearance. Furthermore, there is a problem with respect to the durability and stability of the antistatic effect, such that the antistatic effect is lost by washing the surface of the molded product with a solvent or storing it in an environment of low humidity.
In addition to such a surfactant, there is also a method of imparting antistatic properties by using carbon, but it is not possible to color, the toughness is reduced, the required performance is not stable at the antistatic level, and thermal There was a problem that it was unstable, for example, it emitted a bad odor of formaldehyde gas during continuous molding, leading to a problem of environmental pollution.

[0003]

In order to solve such problems, the present inventors have confirmed the effects of various substances on polyacetal, and as a result, identified a specific antistatic agent as a specific stable compound. By using in combination, a material showing excellent thermal stability, less environmental dependence, and stable and stable antistatic performance without deteriorating the mechanical strength and further processability of the polyacetal resin is obtained. They have found that they can be obtained and have reached the present invention. That is, the present invention relates to (A) 100 parts by weight of a polyacetal resin, (B) 0.01 to 5 parts by weight of an antioxidant (C) one selected from melamine and its derivatives, melamine formaldehyde resin, polyamide and polyacrylamide, or 0.001 to 5 parts by weight of two or more nitrogen-containing compounds (D) A basic carbonate of an alkali metal having a composition represented by the following formula (1) and a metal mainly containing aluminum or an anion exchanger thereof, and a polyalkylene. A polyacetal resin composition comprising 0.1 to 40 parts by weight of an antistatic agent composed of a clathrate in which a polyol or an alkali metal salt-soluble polyalkylene polyol is clathrated. _{Al x M y R z (OH} ) 6 · a / nA · mH 2 O (1) ( wherein, x is a number from 0.6 to 3, y is a number from 0 to 3, z is 0 to 2.4 , Y + z is a non-zero number, a is a number from 0 to 6, M is an alkali metal, R is an alkaline earth metal, A is an anion, and n is an anion A. And m is a number of 3 or less.) Hereinafter, the constituent components of the composition of the present invention will be described in detail.

The composition of the present invention comprises (B) an antioxidant and (C)
A specific nitrogen-containing compound (D) is used in combination with an antistatic agent having the above-mentioned specific structure, (D)
As a component, preferably, a polyalkylene polyol or an alkali metal salt-dissolved polyalkylene polyol in which polyalkylene polyol is dissolved is included in an amount of 20 to 110 parts by weight per 100 parts by weight of a basic carbonate or an anion exchanger thereof. What is used is used.

The antistatic agent of the component (D) has a base composed of a basic carbonate of an alkali metal having a composition represented by the above formula (1) and a metal mainly composed of aluminum or an anion exchanger thereof, Especially as an alkali metal, L
Although i, Na and K are used, Li is most effective in terms of antistatic property. Further, as the metal in the component, in addition to the above metals, a small amount of an alkaline earth metal such as magnesium, calcium, barium, etc., or a Group IIB metal component such as zinc can be contained. In the antistatic agent used in the present invention, the most preferred form that can be added to the polyacetal resin is a substrate made of aluminum / lithium / hydroxycarbonate. This is ideally expressed by the following formula. [Al ₂ Li (OH) ₆ ] ₂ CO ₃ · mH ₂ O In this structure, Al ³⁺ ions form a gibbsite type layered lattice, and have an octahedral structure in which Li ions enter vacancy points. However, the composition ratio can be changed depending on the degree of substitution with vacancies. In another suitable form, similar basic carbonates can also be used. As an example, mention may be made of aluminum sodium hydroxycarbonate, which ideally has the chemical structure represented by the formula: AlNa (OH) ₂ CO ₃ · mH ₂ O In addition, the carbonate anion in the basic carbonate is a large number of inorganic or organic anions such as sulfate ion, sulfite ion, oxyacid ion of phosphorus, hydrohalic acid, and peroxy acid. At least part of the ions can be ion-exchanged with halogenate ions, acetic acid, succinic acid, maleic acid, stearic acid, adipic acid, alkylsulfonic acids, etc., and these anion exchangers can also be used as the substrate. Generally, it is preferable that the anion is carbonate ion in terms of thermal stability. The basic carbonate and its ion exchanger may be those having a uniform composition or fine crystals or crystals, but generally fine crystalline ones are excellent in dispersibility. This basic carbonate is produced by a known method, but it is preferable that the molar ratio of Al and alkali metal is in the range of 1 to 2 from the viewpoint of thermal stability and antistatic property. Furthermore, the equivalent ratio of hydroxyl group and anion, OH / A
Is preferably in the range of 1 to 3 from the viewpoint of anti-bleeding property and antistatic property. A water-soluble aluminum salt, an alkali carbonate, and optionally a water-soluble alkaline earth metal salt are reacted in the presence of alkali hydroxide in a predetermined amount ratio, and if necessary, a coprecipitate formed is aged, or further hydrothermally treated. By doing so, a basic carbonate can be obtained.

Aluminum chloride is particularly suitable as the water-soluble aluminum salt, but sulfates and nitrates are also used. As the alkali carbonate, lithium carbonate, sodium carbonate, potassium carbonate are used. Chlorides are suitable as the alkaline earth metal, but nitrates and the like can also be used. Caustic soda is suitable as the alkali hydroxide. The reaction is preferably carried out in an aqueous medium, and it is generally good to carry out the reaction under conditions in which carbonate is present in excess. Generally, it is preferable to carry out the reaction by adding a solution of a water-soluble aluminum salt or an alkaline earth metal salt to a solution of alkali carbonate and alkali hydroxide. The reaction temperature is suitably 40 to 200 ° C. The coprecipitate is generally a dense composition or fine crystals,
This can be used as it is as a substrate of the present antistatic agent, but it is generally used after aging the coprecipitate in water at a temperature of 60 to 100 ° C. and adjusting the particle size. Further, the aged product can be subjected to an aging treatment at a higher temperature (80 to 110 ° C.) or a hydrothermal treatment at a high temperature of 110 ° C. or more to precipitate more developed fine crystals or crystals. The basic carbonate or its anion exchanger used as a substrate has a pore volume (V _m ) of mesopores in the pore radius range of 200 to 1000Å to quasi-macropores (0.5 _m ) measured by mercury porosimetry.
/ g or more, particularly 1.0 cc / g or more, and the pore volume ratio represented by (pore volume / total pore volume) per total pore volume (V ₀ ) is 30% or more. preferable. The basic carbonate or its anion exchanger is generally 0.05 to 1.0 μm, particularly 0.05 to 1.0 μm as measured by electron microscopy.
It preferably has a number average primary particle diameter of 0.5 μm, and the secondary particle diameter (median diameter) measured by the Coulter counter method is 0.5 to 10 μm, more preferably 1
It is said that the preferable range is from 1 to 3 μm, particularly from 1 to 3 μm. In addition, the above-mentioned basic carbonate or anion exchanger thereof can be subjected to a commonly used surface treatment for the purpose of suppressing aggregation and dispersibility in a polyacetal resin. For example, fatty acids, fatty acid esters, fatty acid metal salts and the like can be used as the surface treatment agent.

The antistatic agent used in the present invention can be obtained by using the above-mentioned basic carbonate or anion exchanger as a substrate, and encapsulating the polyalkylene polyol or the alkali metal salt-dissolved polyalkylene polyol. . As the polyols to be clathrated, polyalkylene glycol, a copolymer mainly composed of polyalkylene glycol, and an ether addition product or esterified product thereof can be used. For example, polyethylene glycol, polyoxyethylene-polyoxypropylene copolymer, ethylene glycol, propylene glycol, glycerin, pentaerythritol, an adduct of a polyhydric alcohol such as sorbitol with ethylene oxide or propylene oxide, a fatty acid and ethylene oxide or propylene. Esters and the like formed from oxide are used. It is particularly preferable to use polyalkylene glycol. The polyalkylene glycol may have various molecular weights, but generally has a number average molecular weight of 10,000.
In the following, it is considered that the range of 200 to 8000 is particularly desirable in terms of the combined characteristics of conductivity and bleed resistance. Furthermore, it is also possible to mix and use those having various molecular weights. By dissolving an alkali metal salt in this polyol, the antistatic property can be further improved. As the alkali metal salt, lithium perchlorate, potassium perchlorate, sodium perchlorate, lithium iodide,
Lithium trifluoromethanesulfonate, sodium trifluoromethanesulfonate, potassium trifluoromethanesulfonate, sodium iodide, lithium stearate, sodium stearate, lithium maleate,
Lithium succinate, potassium succinate, lithium adipate, lithium glycinate and the like can be used. Particularly preferred are lithium perchlorate, lithium iodide, lithium trifluoromethanesulfonate, lithium stearate, lithium maleate, lithium succinate, lithium adipate, and lithium glycinate. These alkali metal salts are polyalkylene polyols 100
It is preferably used in an amount of 1 to 20 parts by weight per part by weight.

The content of the polyalkylene polyols or the alkali metal salt-soluble polyalkylene polyols is
Preferably 20 to 10 per 100 parts by weight of the above basic carbonate.
0 parts by weight, particularly preferably in the range of 50 to 100 parts by weight, if less than the above range, the antistatic property is not sufficient,
If it exceeds the above range, the bleeding tendency increases. By blending the antistatic agent thus prepared with the polyacetal resin, it is possible to impart desired antistatic properties to the intended purpose. The content of antistatic agent is polyacetal resin
The amount is preferably 0.1 to 40 parts by weight, more preferably 1.0 to 20 parts by weight, based on 100 parts by weight, and the amount can be selected according to the required antistatic performance. If the content is less than the above, the desired antistatic performance cannot be obtained, and if it is more than the above, the antistatic performance is saturated and the physical properties are adversely affected.

Next, as the (B) antioxidant used in the present invention, any of hindered phenol type, amine type, phosphorus type and sulfur type antioxidants can be used.
A hindered phenolic antioxidant is particularly preferable. As a specific example, 2,2'-methylenebis (4-methyl-6-
t-butylphenol), 1,6-hexanediol bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythritol tetrakis [3- (3,5-di-t-butyl) -4-Hydroxyphenyl) propionate], triethylene glycol bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,3,5-trimethyl-2,
4,6-Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, n-octadecyl-3- (4'-
Hydroxy-3 ', 5'-di-t-butylphenol) propionate, 4,4'-methylenebis (2,6-di-t-butylphenol), 4,4'-butylidenebis (3-methyl-)
6-t-butylphenol), distearyl-3,5-di-t-butyl-4-hydroxybenzylphosphonate,
3,9-bis {2- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy]-
1,1-Dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5] undecane, 2-t-butyl-
6- (3-t-butyl-5-methyl-2-hydroxybenzyl) -4-methylphenyl acrylate, N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocin There is namamide, and at least one kind or two or more kinds thereof can be used, and among these, 1,6-hexanediol bis [3- (3,5-di-t
-Butyl-4-hydroxyphenyl) propionate], pentaerythritol tetrakis [3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate], triethylene glycol bis [3- (3-t-
Butyl-5-methyl-4-hydroxyphenyl) propionate], 3,9-bis {2- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethyl Ethyl} -2,4,8,
10-Tetraoxaspiro [5,5] undecane, N, N '
-Hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocinnamamide) is a particularly preferred substance. The amount of the (B) antioxidant added and compounded in the present invention is 0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight, per 100 parts by weight of the polyacetal resin. If the amount added is too small, no sufficient effect can be obtained. If the amount added is too large, the effect of thermal stability reaches saturation and the color tends to change, which is not preferable.

Further, (C) nitrogen-containing compounds include melamine and its derivatives, melamine formaldehyde resin,
One or more selected from polyamide and polyacrylamide are used. Specific examples of the (C) nitrogen-containing compound are shown below. First, as melamine and its derivatives,
Melamine (2,4,6-triamino-sym-triazine),
Melem, melam, melon, N-butylmelamine, N-phenylmelamine, N, N-diphenylmelamine, N, N-diallylmelamine, N, N '', N ''-trimethylolmelamine,
Benzoguanamine (2,4-diamino-6-phenyl-sy
m-triazine), 2,4-diamino-6-methyl-sym
-Triazine, 2,4-diamino-6-butyl-sym-triazine, 2,4-diamino-6-benzyloxy-sym
-Triazine, 2,4-diamino-6-butoxy-sym-
Triazine, 2,4-diamino-6-cyclohexyl-sy
m-triazine, 2,4-diamino-6-chloro-sym-
Triazine, 2,4-diamino-6-mercapto-sym-
Triazine, 2,4-dioxy-6-mercapto-sym-
Triazine, 2,4-dioxy-6-amino-sym-triazine (amelide), 2-oxy-4,6-diamino-
Sym-triazine (amerine), N, N, N ', N'-tetracyanoethylbenzoguanamine and the like are used. The melamine-formaldehyde resin is produced from melamine and formaldehyde in a molar ratio of 1: 0.8-1: 10.0,
A water-insoluble melamine-formaldehyde polycondensate is used. As the polyamide, a homo- or copolymer polyamide such as nylon 12, nylon 6/10, nylon 6/66/610, a substituted polyamide having a methylol group, etc.,
A polyesteramide synthesized from a nylon salt, caprolactam, or a combination with caprolactone or caprolactam is used. As the polyacrylamide, one or more of acrylamide homopolymers, copolymers thereof, and crosslinked polymers are used.
Among these, it is preferable to use one or more selected from melamine and melamine derivatives and melamine-formaldehyde resins. Further, it is produced from melamine and formaldehyde in a molar ratio of 1: 0.8-1: 10.0. It is particularly preferable to use a melamine-formaldehyde resin which is a water-insoluble melamine-formaldehyde polycondensate. The content of the nitrogen-containing compound is preferably in the range of 0.01 to 5 parts by weight per 100 parts by weight of the polyacetal resin. If the content is higher than the above, the effect will be saturated, causing bleeding and discoloration, which is not preferable. If it is too small, no sufficient effect can be obtained.

The polyacetal resin to which the above-mentioned additives are added is a polymer compound having an oxymethylene group (--CH ₂ O--) as a main constituent unit, and has a constitution other than the polyacetal homopolymer and the oxymethylene group. It may be a polyacetal copolymer, a terpolymer or a block copolymer containing a small amount of units, and the molecule may have not only a linear structure but also a branched or crosslinked structure.
Further, there is no particular limitation on the degree of polymerization or the like.

The resin composition of the present invention may contain various known additives, though not essential, depending on its purpose. Examples of additives include various colorants, lubricants, release agents, nucleating agents, different polymers, organic modifiers, and reinforcing inorganic fillers. The method for preparing the composition of the present invention is not particularly limited, and can be easily prepared by known equipment and methods generally used as conventional resin composition preparation methods. For example,
i) After mixing each component, kneading and extruding with an extruder to prepare pellets, and then molding, ii) Once preparing pellets with different compositions, mixing the pellets in a prescribed amount and molding A method of later obtaining a molded article of the target composition,
iii) Any method such as directly charging one or more of each component into a molding machine can be used. In addition, mixing a part of the resin component in the form of fine powder with the other components and adding the powder is a preferable method for uniformly blending these components.
Further, the resin composition according to the present invention can be molded by any of extrusion molding, injection molding, compression molding, vacuum molding, blow molding, and foam molding.

[0013]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. First, the antistatic agent used in the present invention will be described. [Preparation of Antistatic Agent] The preparation method of the antistatic agent is as follows. (Preparation of Substrate) 50.0 g of sodium hydroxide and 14.9 g of sodium carbonate were added to 4.0 liters of water with stirring, and the mixture was heated to 40 ° C. Then, the molar ratio of CO ₃ / Li is 2.0, Al / L
A solution having 18.66 g of lithium carbonate and 99.56 g of aluminum chloride dissolved in 0.8 liter of water so that the molar ratio of i was 1.5 was gradually poured to obtain a slurry having a pH of 10.7. Then, with stirring, at a temperature of 80 to 100 ° C, about 10 to 18
After aging for 1 hour, 1.1 g of stearic acid was added, surface treatment was performed with stirring, filtration, washing with water, drying at 70 ° C., and then crushing with a small sample mill to prepare a substrate-1. Further, a slurry having a pH of 10.7 was prepared with the same formulation, aged under the same conditions with stirring, and then hydrothermally treated at 100 to 130 ° C for 6 hours, and 1.1 g of stearic acid was added to the obtained reaction slurry. The surface treatment was performed with stirring. filtration,
It was washed with water, dried at 70 ° C., and then pulverized to obtain Substrate-2. (Evaluation items and evaluation method of the substrate) (1) Pore volume: 0.5g of a sample dried at 150 ° C for 3 hours in a constant temperature dryer was precisely weighed, and a mercury porosimeter (AG65 type manufactured by Carlo Erba Co.) was used. Used, sample pore radius 7
Total pore volume V ₀ up to 5000-18Å and pore radius 200-1000
The mesopore-quasi-macropore volume V _{m up} to Å was determined. The ratio R _m of mesopores ~ quasi macropore volume V _m to the total pore volume V ₀ (the mesopores ~ quasi macropore volume ratio) was calculated from the following equation. R _m = V _m / V ₀ × 100 Primary particle size: Measured by arithmetically averaging primary particles in a selected area image using a scanning electron microscope WET-SEM (WS-250) manufactured by Akashi Beam Technology Co., Ltd. 3) Secondary particle diameter: measured by Coulter counter model TA-II type manufactured by Coulter Counter Co., Ltd. The pore volumes, the primary and secondary particle diameters of the base bodies-1 and -2 are shown in Table 1. (Preparation of Antistatic Agent) Next, using these bases -1 and -2, 2 parts by weight of LiCl based on 100 parts by weight of the base was used.
Polyethylene glycol (PEG) 80 in which O ₄ is dissolved
50 parts by weight (PEG # 200; 50 parts by weight, PEG # 6000; 30 parts by weight) are melted at 90 to 100 ° C. and mixed with the substrate in a mixer rotated at 400 rpm at a low speed, then 1200
After high speed mixing at rpm, the mixture was discharged from the mixer at 60 ° C. or lower and 800 rpm or lower to obtain antistatic agents D-1 (base-1 base) and D-2 (base-2 base). Further, using the same substrate-1, 80 parts by weight of polyethylene glycol (PEG) in which 2 parts by weight of LiClO ₄ is dissolved (PEG # 6000; 40 parts by weight, PEG # 6000; 40 parts by weight, based on 100 parts by weight of the substrate) Part) was combined with the substrate to prepare antistatic agent D-3 in the same manner as above.

Examples 1 to 12 A polyacetal resin (DURACON, manufactured by Polyplastics Co., Ltd.) was mixed with a hindered phenolic antioxidant, a nitrogen-containing compound and various antistatic agents in the proportions shown in Table 2. Then, the mixture was melt-kneaded with a twin-screw extruder to prepare a pelletized composition. Then, a test piece was prepared by injection molding using this pellet and evaluated. The results are shown in Table 2.
Shown in. Comparative Examples 1 to 5 For comparison, a system containing no antistatic agent, or an antistatic agent or stabilizer other than those specified in the present application was added to and mixed with the polyacetal resin at a ratio shown in Table 3 to prepare pellets, and then test pieces Was prepared and evaluated. The results are shown in Table 3. (Evaluation item and evaluation method) The evaluation item and evaluation method of the polyacetal resin composition are as follows. Pyrolysis characteristics 1) To evaluate the thermal stability, use 230 pellets of the composition.
Measure the weight loss when heated in air at 45 ° C for 45 minutes.
The heating weight loss rate (% / min) per minute was calculated. 2) To evaluate the formaldehyde odor during molding, 20 molded products (about 30 mm x about 5 mm x about 1.5 mm) immediately after molding were put in a polyethylene bag with a zipper and sealed. Then
After a certain period of time, the bag was opened and the generated odor was evaluated on a four-point scale. A-B-C-D No odor, slightly a little, with a pungent odor Good ← → Poor antistatic performance A disc with a thickness of 3 mm and a diameter of 120 mm was made by injection molding.
After being left in an environment of 23 ° C. and 50% RH for 72 hours, the surface resistance value and the charge voltage half-life were evaluated. Surface resistivity: Measured with ADVANTEST R8340 Applied voltage: 500 V Charging half-life: Measured with static Honest meter (manufactured by Shishido Shokai) Applied voltage: 6 kV Also, in order to evaluate the persistence of antistatic effect, molding under the conditions shown below The evaluation immediately after cleaning the product surface was performed in parallel. Washing conditions: After soaking the test piece in methanol for 20 seconds, the surface methanol was blown off with nitrogen gas and dried.

[0015]

[Table 1]

[0016]

[Table 2]

[0017]

[Table 3]

[0018]

As is clear from the above description and examples, the polyacetal resin composition of the present invention exhibits very good antistatic properties and the antistatic performance is deteriorated even after washing the resin surface with a solvent. There is nothing to do. Further, since the resin composition of the present invention has very little deterioration in thermal properties, which has been a problem with the incorporation of a known antistatic agent, the polyacetal resin has been used so far for automobiles, electric / electronic parts, etc. In the field of, it can be widely used for various applications requiring antistatic properties. In particular, it is suitable for a conveyor belt for transportation where static electricity is apt to occur, and parts such as sheets and films in which dust adhesion and sticking due to static electricity pose a problem.

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Claims (8)

[Claims] 1. (A) 0.01 to 5 parts by weight of an antioxidant with respect to 100 parts by weight of a polyacetal resin (C) one selected from melamine and its derivatives, melamine formaldehyde resin, polyamide and polyacrylamide, or 0.001 to 5 parts by weight of two or more nitrogen-containing compounds (D) A basic carbonate of an alkali metal having a composition represented by the following formula (1) and a metal mainly containing aluminum or an anion exchanger thereof, and a polyalkylene. A polyacetal resin composition comprising 0.1 to 40 parts by weight of an antistatic agent composed of a clathrate in which polyols or alkali metal salt-soluble polyalkylene polyols are clathrated. _{Al x M y R z (OH} ) 6 · a / nA · mH 2 O (1) ( wherein, x is a number from 0.6 to 3, y is a number from 0 to 3, z is 0 to 2.4 , Y + z is a non-zero number, a is a number from 0 to 6, M is an alkali metal, R is an alkaline earth metal, A is an anion, and n is an anion A. Represents the valence of, and m is a number of 3 or less.) 2. The polyacetal resin composition according to claim 1, wherein the antioxidant (B) is a hindered phenolic antioxidant. 3. The polyacetal resin composition according to claim 1, wherein the nitrogen-containing compound (C) is one or more of melamine, a melamine derivative and a melamine formaldehyde resin. 4. The melamine formaldehyde resin as the component (C) comprises melamine and formaldehyde in the ratio of 1: 0.8 to 1: 1.
The polyacetal resin composition according to any one of claims 1 to 3, which is a water-insoluble melamine-formaldehyde polycondensate produced at a molar ratio of 0.0. 5. (D) The antistatic agent comprises 20 parts by weight of a polyalkylene polyol or a polyalkylene polyol in which a polyalkylene polyol or polyalkylene polyol is dissolved per 100 parts by weight of a basic carbonate or an anion exchanger thereof.
~ 110 parts by weight of the inclusions are included.
The polyacetal resin composition according to any one of 4 above. 6. The (D) alkali metal salt-dissolved polyalkylene polyol in the antistatic agent component is a solution in which 1 to 20 parts by weight of an alkali metal salt is dissolved per 100 parts by weight of the polyalkylene polyol. The polyacetal resin composition described. 7. (D) The basic carbonate in the antistatic agent component,
The polyacetal resin composition according to claim 5, which is lithium aluminum hydroxycarbonate. 8. The (D) polyalkylene polyol in the antistatic agent component is polyethylene glycol.
The polyacetal resin composition described.