JPH07179720A - Polyacetal resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition, comprising a specific reinforcing filler, a specified antistatic agent and a specific polyacetal resin in a specified proportion, excellent in mechanical strength and flexural elastic modulus and suitable as a thin-wall molding, etc. CONSTITUTION:This polyacetal resin composition is obtained by blending (A) 100 pts.wt. polyacetal resin with (B) 1-70 pts.wt. one or two or more reinforcing fillers selected from granular, flaky and fibrous fillers such as surface treated glass fiber or titanium oxide fiber and (C) 0.1-40 pts.wt. antistatic agent composed of a clathrate prepared by including polyalkylene polyols or the polyalkylene polyols containing an alkali metallic salt dissolved therein in a basic carbonate of a metal consisting essentially of an alkali metal and aluminum having a composition expressed by the formula {(x) is 0.6-3; (y) is 0-3:-z) is 0 2.4; [(y)+(z)] is not 0; (a) is 0-6; M is the alkali metal; R is an alkaline earth metal; A is an anion; (n) is the valence of A; (m) is <=3} or its anion exchanger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyacetal resin composition which is excellent in mechanical strength, particularly in flexural modulus and retains excellent antistatic property, and does not cause defective appearance. The present invention relates to a polyacetal resin composition that is preferably used for molded articles.

[0002]

As is well known, mechanical properties, thermal properties, long-term properties, friction and wear properties,
Polyacetal resins, which are excellent in molding processability, are widely used as engineering plastics in the fields of automobiles, electric / electronic products and the like. However, with the increase in fields in which polyacetal resins are used, properties of the materials are required to be more specific. For example, there is a demand for a material in which an inorganic filler such as glass fiber, potassium titanate fiber, or talc is blended in a resin to significantly improve mechanical strength.
Coupled with the recent trend toward miniaturization and weight reduction of products, parts are becoming smaller and thinner, and materials having higher strength are being demanded. In particular, in the fields of watch parts such as wristwatches, small electric / electronic equipment products, precision products, etc., the parts themselves are small, and further miniaturization and thinning are being considered. ing. In this tendency, not only glass and fibers of potassium titanate, but also minute inorganic fillers that can be applied to smaller parts have been developed. For example, an excellent resin composition containing titanium oxide fibers is proposed. (JP-A-1-113465). Similarly, glass fillers having a small particle size have been proposed, and materials using these minute fillers have been developed that can be applied to the molding of small-sized, thin-walled molded products. However, with the miniaturization of components, electrostatic charging due to contact is more likely to occur, and there are increasing cases where failures due to static electricity occur. Like many plastics, polyacetal resin has high surface resistivity, so depending on the application, electrostatic noise, surface contamination,
Problems such as adhesion may be caused by charging. In particular, in the field of precision products such as watches, dust and adhesion of dust due to electrification appear as product defects as they are. Therefore, with the miniaturization of parts, the demand for antistatic is increasing. Furthermore, the number of cases in which such electrical, electronic, and precision products are assembled overseas is increasing, and the work may be performed in a low-humidity environment, which is different from Japan, in a situation where static electricity is easily generated. The need for imparting preventive properties is increasing. Surfactants are generally used to eliminate the electrostatic damage in such plastics, and although they are effective for polyacetal resins, they have excellent performance in anionic, cationic, and amphoteric surfactants. The agent is not preferable because the heat stability and hue stability of the polyacetal resin are deteriorated by the ions. Nonionic surfactants are 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, the addition of such a large amount of surfactant generally deteriorates the mechanical properties and molding processability of the molded product, and also causes many stains on the surface of the molded product to impair the appearance. Will result in many problems. In addition, the addition of a large amount of surfactant tends to reduce the adhesiveness between the inorganic filler and the resin compounded in response to downsizing and thinning, and the initial strengthening effect is weakened. There was also the problem of becoming.

[0003]

In order to solve such problems, the present inventors have confirmed the effects of various substances on the polyacetal resin, and as a result, have identified a specific antistatic agent with a specific inorganic filler. When used in combination with, a polyacetal resin composition that retains excellent antistatic properties, is excellent in mechanical properties, especially bending elastic modulus that is important for the tooth root strength of gears, etc., and does not cause poor appearance They have found that they can be obtained and have reached the present invention. That is, the present invention is based on 100 parts by weight of (A) polyacetal resin and 1 to 70 parts by weight of one or more reinforcing fillers selected from (B) granular or flake-like or fibrous fillers. Part (C) Alkali metal having a composition represented by the following formula (1) and a basic carbonate of a metal mainly comprising aluminum or anion exchanger thereof, polyalkylene polyols or alkali metal salt-dissolving polyalkylene polyols The present invention relates to a polyacetal resin composition containing 0.1 to 40 parts by weight of an antistatic agent composed of a clathrate in which the above is included. _{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 is characterized by using (B) a reinforcing filler together with (C) an antistatic agent having the above-mentioned specific structure, preferably as the (C) component.
Those in which the polyalkylene polyol or the alkali metal salt-dissolved polyalkylene polyol is included in an amount of 20 to 110 parts by weight per 100 parts by weight of the basic carbonate or its anion exchanger are used.

The antistatic agent of the component (C) is composed of a basic carbonate of a metal mainly composed of an alkali metal and aluminum having the composition represented by the above formula (1) 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 11 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.

As the (B) reinforcing filler used in the present invention, one or more organic or inorganic fillers selected from granular, flake-like and fibrous fillers are used. To be done. Specific examples are glass beads, glass balloons, glass flakes, mica, talc, glass fibers, polyamide fibers, carbon fibers, wholly aromatic polyester fibers, potassium titanate fibers, titanium oxide fibers, zinc oxide fibers, calcium carbonate fibers. , One type or two or more types selected from metal fibers such as stainless steel, aluminum borate fibers, crushed glass flakes and glass fibers, and the like. Among them, when used in the field of thin products of several tens of μm or less, small parts such as precision products, small electric / electronic parts, etc., granular particles with an average particle size of 50 μm or less, flake filler, average fiber length of 100 μm or less, more preferably 50 μm. Using the following fibrous filler, dispersion of the filler in the molded article,
It is preferable because problems such as gate clogging during molding do not occur. Furthermore, a fibrous filler is suitable for strength,
When there is no anisotropy in a molded product such as a timepiece gear part and dimensional accuracy is required, a granular filler is preferably used. The compounding amount of the reinforcing filler (B) is preferably in the range of 1 to 70 parts by weight with respect to 100 parts by weight of the polyacetal resin. If it is less than 1 part by weight, the reinforcing effect is poor and it is not practical, and if it exceeds 70 parts by weight, the fluidity is remarkably lowered and the mechanical properties and thermal stability of the polyacetal resin are extremely lowered, which is not preferable. In the present invention, preferably a surface-treated reinforcing filler is used. The glass is subjected to a surface treatment for the purpose of improving the adhesion with the resin interface.
In the case of potassium titanate fiber and titanium oxide fiber, if the surface treatment is not performed, the thermal stability of the polyacetal resin will be greatly reduced, and decomposition and foaming will occur during compounding and molding, which is not practical. used. The surface treatment agent applied to the filler in the present invention is not particularly limited in terms of chemical structure as long as it can substantially cover the surface of the filler, and any known agent can be used.
Examples include various coupling agents such as silane-based, titanate-based, aluminum-based zirconate-based coupling agents. Specifically, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, isopropyltristearoyl titanate, diisopropoxyaluminum acetate, n-
Butyl zirconate and the like can be mentioned.

Further, for the purpose of further improving the strength and the dispersibility of the filler, an isocyanate or isothiocyanate compound containing two or more iso (thio) cyanate groups in one molecule may be used in combination. it can. This is probably because the use of iso (thio) cyanate further improves the adhesion between the inorganic filler and the polyacetal resin. Examples include 4,4'-methylenebis (phenylisocyanate), 2,4-tolylene diisocyanate, 2,6
-Tolylene diisocyanate, xylene diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, 1,5-naphthalene diisocyanate, or diisothiocyanate corresponding thereto, and
Any of these dimers, trimers, and compounds in which the isocyanate group (-NCO) is protected in any form can be used, but various properties such as discoloration degree such as melt processing, or handling Considering the safety of 4,4'-methylenebis (phenylisocyanate), isophorone diisocyanate, 1,5-naphthalene diisocyanate, 2,4
-Tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,6-hexamethylene diisocyanate, and their modified forms (or derivatives) such as dimers and trimers
Is particularly preferable.

Granules of these inorganic fillers are much more excellent in operability during compounding than when they are not granules, and are more preferable. However, if the convergence is too strong, dispersion of the filler may be caused and mechanical properties may be deteriorated, so caution is required.

The polyacetal resin (A) to which the above-mentioned additives are added is a polymer compound having an oxymethylene group (--CH ₂ O--) as a main constituent unit, in addition to the polyacetal homopolymer and oxymethylene group. It may be any of a polyacetal copolymer, a terpolymer and a block copolymer containing a small amount of other constitutional unit, and the molecule may have not only a linear structure but also a branched or crosslinked structure. Also, there is no particular limitation on the degree of polymerization, etc., but especially when aiming at small and thin molded products, the test standard ASTM D
It is desirable that the melt index measured at 190 ° C by the method according to -1238 is 7 g / 10 min. Or more.

Further, it is preferable to add a known stabilizer to the resin composition of the present invention. As the stabilizer, a hindered phenolic antioxidant and a nitrogen-containing compound are used in combination. Further, the present composition may contain various known additives, though not essential. Examples of additives include various antioxidants, anti-acid agents, colorants, lubricants, release agents, nucleating agents, different polymers, organic modifiers and the like. 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) a method of mixing each component, kneading and extruding with an extruder to prepare pellets, and then molding, ii) once preparing pellets having different compositions, mixing the pellets in a predetermined amount and molding. Any method such as a method of obtaining a molded article having a desired composition after molding and iii) a method of 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. The resin composition of the present invention is processed into various molded articles by a general molding method such as injection molding. Particularly, it is suitably used for molded products, wristwatch parts, printer parts, desk-top computer parts and the like used as small or thin precision parts.

[0014]

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 carried out with stirring, filtration, washing with water, drying at 70 ° C., and pulverization with a small sample mill to prepare a substrate. (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 (2) Primary particle size: Using the scanning electron microscope WET-SEM (WS-250) manufactured by Akashi Beam Technology Co., Ltd., the primary particles in the selected area image were arithmetically averaged. (3) Secondary particle diameter: measured by Coulter Counter Model TA-II type manufactured by Coulter Counter Co., Ltd. The pore volume of the substrate, the primary and secondary particle diameters are shown in Table 1. (Preparation of Antistatic Agent) Next, using this substrate, a substrate 100
80 parts by weight of polyethylene glycol (PEG) in which 2 parts by weight of LiClO ₄ is dissolved (PE
G # 400; 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 a low speed of 400 rpm, and then mixed at a high speed of 1200 rpm. The antistatic agent C-1 was obtained by paying out from the mixer under the conditions of not higher than 800C and not higher than 800 rpm.

Examples 1 to 10 To 100 parts by weight of a polyoxymethylene copolymer (DURACON, manufactured by Polyplastics Co., Ltd.), various fillers and antistatic agents were added and mixed in the proportions shown in Table 2, Melt kneading was carried out 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. Comparative Examples 1 to 5 For comparison, the same evaluation was carried out for the systems in which the reinforcing material and the antistatic agent were individually added. Further, different antistatic agents were added to and mixed with the polyoxymethylene resin in the proportions shown in Table 3 in the same manner as described in Examples,
Pellets were prepared and test pieces were prepared for evaluation. 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. A test piece having a thickness of 6 mm, a width of 13 mm and a length of 127 mm was molded by mechanical strength injection molding, and the flexural modulus was measured by a method according to ASTM D-790. Antistatic performance Injection molding is used to make a disc with a thickness of 3 mm and a diameter of 120 mm.
After being left in an environment of 23 ° C. and 50% RH for 72 hours, the surface resistivity was evaluated. Surface resistivity: Measured with ADVANTEST R8340 Applied voltage: 500 V Appearance A test piece with a thickness of 3 mm, a width of 50 mm and a length of 70 mm was formed by injection molding, and left as a accelerated test for 2 days at a high temperature of 80 ° C. The appearance was observed. The surface condition observed with the naked eye is 3
The grade was evaluated. Good ← A B C → Bad No stains Excretions Little stains Excessive stains

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

As is apparent from the above description and Examples, the antistatic polyacetal resin composition of the present invention has good antistatic properties, excellent mechanical strength, especially bending elastic modulus, and excellent appearance. Since it does not cause defects, it can be used not only in the fields where reinforced polyacetal resin has been used until now, but by selecting the size of the filler, small parts such as watch parts, small electric / electronic products, precision products, etc. It is also suitable for use.

Claims (10)

[Claims] 1. 1 to 70 parts by weight of one or more reinforcing fillers selected from (B) granular, flaky or fibrous fillers per 100 parts by weight of (A) polyacetal resin. Part (C) Alkali metal having a composition represented by the following formula (1) and a basic carbonate of a metal mainly comprising aluminum or anion exchanger thereof, polyalkylene polyols or alkali metal salt-dissolving polyalkylene polyols A polyacetal resin composition comprising 0.1 to 40 parts by weight of an antistatic agent consisting of a clathrate in which the above is included. _{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 (B) reinforcing filler is one or more selected from surface-treated glass fibers, glass beads, glass flakes, potassium titanate fibers, and titanium oxide fibers. The polyacetal resin composition according to claim 1, which is 3. The polyacetal resin composition according to claim 1, wherein the granular filler of (B) the reinforcing filler has an average particle diameter of 50 μm or less. 4. (B) The fibrous filler among the reinforcing fillers,
The polyacetal resin composition according to claim 1 or 2, which has an average fiber length of 50 µm or less and an aspect ratio of 10 or more. 5. The (C) antistatic agent comprises 20 to 110 parts by weight of polyalkylene polyol or alkali metal salt-dissolved polyalkylene polyol per 100 parts by weight of basic carbonate or anion exchanger thereof. The polyacetal resin composition according to any one of claims 1 to 4, which are in contact with each other. 6. The (C) alkali metal salt-dissolving polyalkylene polyols in the antistatic agent component are those in which 1 to 20 parts by weight of alkali metal salts are dissolved per 100 parts by weight of polyalkylene polyols. The polyacetal resin composition described. 7. (C) The basic carbonate in the antistatic agent component,
The polyacetal resin composition according to claim 5, which is lithium aluminum hydroxycarbonate. 8. The polyalkylene polyol in (C) the antistatic agent component is polyethylene glycol.
The polyacetal resin composition described. 9. A molded product used as a small-sized or thin-walled precision component, which is formed by molding the polyacetal resin composition according to any one of claims 1 to 8. 10. The molded article according to claim 9, wherein the small-sized or thin-walled precision component is a clock component, a printer component, or a desktop computer component.