JP3168639B2 - Polyoxymethylene resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyoxymethylene resin composition which has extremely low formaldehyde odor and mold deposit during molding and is excellent in thermal stability.

[0002]

2. Description of the Related Art Polyoxymethylene resins are known as engineering plastics having a good balance between mechanical strength and impact resistance, and are used in a wide range of fields as electronic equipment and automobile parts.

[0003] However, polyoxymethylene resin has poor thermal stability due to its structure.
There are several points that need to be improved, such as deteriorating the working environment due to generation of gas, and impairing the appearance of a molded product due to adhesion of oligomers or the like generated on a mold generally called a mold deposit.

[0004] As a method of improving the drawbacks of the polyoxymethylene resin, various stabilizer formulations have hitherto been devised. In such a polyoxymethylene resin stabilizer formulation, the addition of an antioxidant is an essential condition. However, a hindered phenol compound used alone as an antioxidant for a polyoxymethylene resin,
It is not possible to obtain sufficient thermal stability. Conventionally, polyamide compounds have been added as heat stabilizers, but these compounds alone or in combination with a hindered phenolic antioxidant could not provide sufficient heat stability. . For example, a resin composition obtained by adding a polyamide and a fatty acid metal salt having 12 to 35 carbon atoms to a polyoxymethylene resin together with a hindered phenol-based antioxidant is disclosed in JP-B-62-4422. .

Recently, a method using a hydroxy group-containing polymer or oligomer such as poly (ethylene vinyl alcohol) as a heat stabilizer has been described in JP-A-62-288648 and JP-A-62-288649. I have.

[0006]

However, Japanese Patent Publication No. Sho 62-4422 and Japanese Patent Application Laid-open No. Sho 62-288648 are mentioned above.
The stabilizer formulation of the resin composition proposed in JP-A-62-288649 and JP-A-62-288649 cannot provide a polyoxymethylene resin composition having sufficiently excellent thermal stability. Therefore, an object of the present invention is to obtain a polyoxymethylene resin composition having excellent thermal stability that can withstand high-temperature and long-term molding.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have found that a polyoxymethylene resin composition containing an oxazoline compound or an oxazine compound with respect to the polyoxymethylene resin. However, they found that the thermal stability was extremely high, and reached the present invention.

That is, the present invention comprises 0.01 to 10 parts by weight of at least one compound selected from the following oxazoline compounds and oxazine compounds based on 100 parts by weight of a polyoxymethylene resin. It is a polyoxymethylene resin composition. Oxazoline compound 2,2 '-(1,3-phenylene) bis (2-oxazoline
Phosphorus), 2,2 '-(1,4-phenylene) bis (2-
Oxazoline), 2-phenyl-2-oxazoline,
2,2'-tetramethylenebis (2-oxazoline). Oxazine compound 2,2 '-(1,3-phenylene) bis (5,6-diphenyl
Dro-4H-1,3-oxazine), 2,2 ′-(1,
4-phenylene) bis (5,6-dihydro-4H-1,
3-oxazine), 2-phenyl-5,6-dihydro-
4H-1,3-oxazine, 2,2'-tetramethylene
Bis (5,6-dihydro-4H-1,3-oxadi
).

The polyoxymethylene resin used in the present invention includes an oxymethylene homopolymer and an oxymethylene unit as a species, and at least one oxyalkylene unit having 2 to 8 carbon atoms in a polymer main chain. Means an oxymethylene copolymer containing

The oxymethylene homopolymer refers to an oxymethylene homopolymer which is stabilized by substituting an unstable hydroxyl group at a terminal with an ester group or an ether group. For example, substantially anhydrous formaldehyde is introduced into an organic solvent containing a basic polymerization catalyst such as an organic amine, an organic or inorganic tin compound, or a metal hydroxide, polymerized, and the polymer is separated by filtration. The product is prepared by heating in acetic anhydride in the presence of sodium acetate to acetylate the terminal.

The oxymethylene copolymer is, for example, a substantially anhydrous trioxane or a cyclic oligomer of formaldehyde such as tetraoxane and at least one cyclic ether or cyclic formal as a copolymerization component. Dissolved or suspended in an organic solvent such as
The polymer is produced by adding a Lewis acid catalyst such as diethyl etherate to polymerize and decomposing and removing unstable terminals. Alternatively, the pre-mixture of trioxane and the copolymerization component / catalyst is introduced into a self-cleaning type stirrer without using any solvent to perform bulk polymerization. If desired, the catalyst is removed from the polymer by washing, or the catalyst is deactivated by a deactivator, and then the unstable terminal is decomposed and removed to produce the polymer.

It is particularly preferable that trioxane and cyclic ether or cyclic formal are subjected to bulk polymerization in the presence of a Lewis acid catalyst such as boron trifluoride / diethyl etherate, and then represented by the general formula (1). This is a polymer obtained by adding a hindered amine compound to stop the polymerization reaction, and further decomposing and removing unstable terminals.

[0013]

Embedded image

(Wherein R2 is a hydrogen atom or a group having 1 to 1 carbon atoms)
Represents 30 monovalent organic residues. R3 to R6 have 1 carbon atom
To 5 alkyl groups, which may be the same or different. n represents an integer of 1 or more, and R7 represents an n-valent organic residue. The oxazoline compound or oxazine compound used in the present invention is selected from imino ether compounds represented by the following general formula (2).
Things .

[0015]

Embedded image

(In the formula, X represents an alkylene group which may have a substituent having 2 to 3 carbon atoms. N represents an integer of 1 or more, and R represents an n-valent organic residue.) Specifically, 2,2 ′-(1,3-phenylene) bis (2-oxo
Sazolin), 2,2 '-(1,4-phenylene) bis
(2-oxazoline), 2-phenyl-2-oxazoly
, 2,2'-tetramethylenebis (2-oxazolyl
), 2,2 '-(1,3-phenylene) bis (5,6
-Dihydro-4H-1,3-oxazine), 2,2'-
(1,4-phenylene) bis (5,6-dihydro-4H
-1,3-oxazine), 2-phenyl-5,6-dihi
Dro-4H-1,3-oxazine, 2,2'-tetrame
Tylene bis (5,6-dihydro-4H-1,3-oxa
Gin).

The amount of polyoxymethylene resin 1
It is usually 0.01 to 10 parts by weight, preferably 0.05 to 3.0 parts by weight, based on 00 parts by weight. If the amount is less than 0.01 part by weight, the thermal stability of the polyoxymethylene resin composition is not sufficient, and if it is more than 10 parts by weight, coloring and bleeding are observed, which is not preferable.

The hindered phenolic antioxidant used in the present invention has a molecular weight of 400 or more, and specifically, triethylene glycol-bis [3- (3-t-butyl-5-methyl-4- Hydroxyphenyl) propionate], 1,6-hexanediol-bis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], N, N'-hexamethylenebis (3,5-di-t-butyl-4) -Hydroxyhydrocinnamamide), 2-t-butyl-6- (3'-t-butyl-5'-methyl-2'-hydroxybenzyl) -4-
Methylphenyl acrylate, 3,9-bis [2- {3
-(3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4,8,10-tetraoxaspiro [5,
5] Undecane and the like. Among them, triethylene glycol-bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,
6-hexanediol-bis [3- (3,5-di-t-
Butyl-4-hydroxyphenyl) propionate],
Pentaerythrityl-tetrakis [3- (3,5-di-
t-butyl-4-hydroxyphenyl) propionate] is particularly preferred. When the molecular weight is smaller than 400, the bleeding phenomenon is remarkable, and the appearance of the polyoxymethylene resin composition is impaired, and the thermal stability is lowered, so that the composition cannot be used.

The amount of polyoxymethylene resin 1
It is usually 0.01 to 10 parts by weight, preferably 0.05 to 3.0 parts by weight, based on 00 parts by weight. If the amount is less than 0.01 part by weight, the thermal stability of the polyoxymethylene resin composition is not sufficient, and if it is more than 10 parts by weight, a bleeding phenomenon is observed.

The hindered amine compound used in the present invention has a molecular weight of 400 or more. Specifically, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, dimethyl succinate / 1 -(2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, N, N'-bis (3-aminopropyl) ethylenediamine / 2,4-bis [N-
Butyl-N- (1,2,2,6,6-pentamethyl-4
-Piperidinyl) amino] -6-chloro-1,3,5-
Triazine condensate, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-
2,4-diyl 2,2,6,6-tetramethyl-4
-Piperidinyl) imino {hexamethylene} (2,2,
6,6-tetramethyl-4-piperidyl) imino)}], bis (2,2,6,6-tetramethyl-4-
Piperidyl) sebacate and the like. Among them, bis (2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, dimethyl succinate-1- (2 -Hydroxyethyl) -4-hydroxy-
2,2,6,6-tetramethylpiperidine polycondensate,
N, N'-bis (3-aminopropyl) ethylenediamine 2,4-bis [N-butyl-N- (1,2,2,
6,6-pentamethyl-4-piperidinyl) amino]-
6-chloro-1,3,5-triazine condensate, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} 2 ,
2,6,6-tetramethyl-4-piperidinyl) imino {hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino)}] is particularly preferred. When the molecular weight is smaller than 400, the bleeding phenomenon is remarkable, and the appearance of the polyoxymethylene resin composition is impaired, and the thermal stability is lowered, so that the composition cannot be used.

The amount of polyoxymethylene resin 1
It is usually 0.01 to 10 parts by weight, preferably 0.01 to 3.0 parts by weight, based on 00 parts by weight. If the amount is less than 0.01 part by weight, the thermal stability of the polyoxymethylene resin composition is not sufficient, and if it is more than 10 parts by weight, coloring by heat is intense, which is not preferable.

Examples of the formaldehyde scavenger used in the present invention include polyamide compounds, urethane compounds, pyridine derivatives, pyrrolidone derivatives, urea derivatives, triazine derivatives, hydrazine derivatives, and amidine compounds. 66, polyamide 6/66 binary copolymer, polyamide 6/66/6
10/10 quaternary copolymer, melamine, benzoguanamine, acetoguanamine, N-methylolmelamine, N,
N′-dimethylolmelamine, N, N ′, N ″ -trimethylolmelamine, dicyandiamide and the like are preferred.
Among these, polyamide 6/66/610/12 quaternary copolymer and melamine are particularly preferred. The polyamide 6/66/610/12 quaternary copolymer used in the present invention is a copolymer obtained by copolymerizing a salt of a dicarboxylic acid and a diamine, an ω-aminocarboxylic acid or a lactam. 6, a polyamide 66, a polyamide 11, a polyamide 12, a polyamide 610, and a copolyamide having a structural unit composed of polyamide 12. The composition of the copolyamide can be in various ratios, and in the present invention, any ratio may be used.However, in view of compatibility and dispersibility with the polyoxymethylene resin, the copolyamide usually has a melting point. 50-200 ° C,
Particularly preferably, the composition is in the range of 80 to 170 ° C. The amount of the formaldehyde scavenger added is usually 0.01 to 100 parts by weight of the polyoxymethylene resin.
10 to 10 parts by weight, preferably 0.01 to 3.0 parts by weight. If less than 0.01 parts by weight, the effect of addition does not appear,
When the amount is more than 10 parts by weight, a bleeding phenomenon is observed, which is not preferable.

As a method for producing the polyoxymethylene resin composition of the present invention, generally known methods can be employed. For example, a method of adding the stabilizer used in the present invention in the polymerization or stabilization step of the polyoxymethylene resin, a pellet form of the polyoxymethylene resin and the stabilizer used in the present invention,
The powder or the granules may be mixed and melt-processed as it is, but a method of melt-mixing with a Banbury mixer, a roll, an extruder or the like can also be adopted. Further, a method in which the stabilizer used in the present invention is melt-kneaded with a commercially available polyoxymethylene resin in the same manner as described above can also be employed. In particular, using a single or twin screw extruder,
A method of melt-mixing at a temperature of ２５０250 ° C. is preferred.

The resin composition of the present invention contains calcium carbonate, barium sulfate, and calcium carbonate as long as the effects of the present invention are not impaired.
Filler such as clay, titanium oxide, silicon oxide, mica powder, glass beads, reinforcing agent such as carbon fiber, glass fiber, ceramic fiber, aramid fiber, potassium titanate fiber, coloring agent (pigment, dye), core Agents, plasticizers, release agents such as ethylene bis stearamide, polyethylene wax, conductive agents such as carbon black, antioxidants such as thioether compounds and phosphite compounds, benzophenone compounds, benzotriazole compounds Additives such as a light stabilizer such as a compound, a pressure-sensitive adhesive, a lubricant such as a metal soap, a hydrolysis resistance improver, and an adhesion aid can be arbitrarily contained.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples.

[0026]

The present invention will be described below with reference to examples. All percentages and parts in the examples are on a weight basis.

The MI value, mechanical properties, thermal decomposition rate Kx, formaldehyde odor generation during continuous molding, and the stability of the polymer in the molten state shown in the Examples and Comparative Examples are as follows. Measured or observed.

Molding: Using an injection molding machine having an injection capacity of 5 ounces, cylinder temperature 190 ° C., mold temperature 65
C. and a molding cycle of 50 seconds, ASTM No. 1 dumbbell test pieces were injection molded.

MI value: Measured at a temperature of 190 ° C. and a load of 2160 g according to ASTM D-1238 using pellets dried in a hot air oven at 80 ° C. for 3 hours.

Mechanical properties: AS obtained by the above injection molding
ASTM D-638 using a TM1 dumbbell specimen
The tensile strength was measured according to the method.

Heat decomposition rate Kx: Kx means the decomposition rate when left at x ° C. for a certain time. Using a thermobalance device, weigh approximately 15 milligrams of sample under an air atmosphere.
It was left at x ° C. and determined by the following equation.

Kx = (W0−Wy) × 100 / W0 (%) Here, W0 means a sample weight before heating, and Wy means a sample weight after heating for y hours. In addition, the thermobalance device is
Using TG / DTA200 of Seiko Denshi Co., x = 2
The measurement was performed at 20 ° C. and y = 60 minutes.

Occurrence of formaldehyde odor during continuous molding: Continuous molding was performed for 10,000 shots under the aforementioned molding conditions, and the occurrence of formaldehyde odor at that time was evaluated as follows. Almost no formaldehyde odor: ○, slight formaldehyde odor: △, considerable formaldehyde gas is generated, and eyes and throat hurts when there is a place, or formaldehyde gas is generated violently at the place Can not: ×.

Melt retention stability of polymer: After the polymer is melted and retained at 190 ° C. for 2 hours in a melt indexer, a load of 2160 is applied according to the ASTM D-1238 method.
The MI value was measured in grams. The MI value at this time is M
Assuming that I ′ and MI value before the melt retention were MI0, the melt retention stability was represented by ΔMI = MI′−MI0.

In Examples and Comparative Examples, the oxymethylene copolymer (P-1) produced by the following method and a commercially available copolymer (Polyplastics "Duracon" M90) (P
-2), an oxymethylene homopolymer (P-3) produced by the following method, or a commercially available homopolymer (DuPont)
Delrin "II500) (P-4) was used.

Method for Producing Oxymethylene Copolymer (P-1) Trioxane (22.5 kg / l) was placed in a twin-screw extruder type polymerization machine (100 mmφ, cylinder length (L) / cylinder diameter (D) = 10.2). h), 1,3-dioxolane (70
0g / h), and 1 as a catalyst for trioxane.
00 ppm boron trifluoride / diethyl etherate (2.5% benzene solution), 600 as a molecular weight regulator
ppm of methylal was supplied, and continuous polymerization was performed. The polymerization controlled the outer jacket to 60 ° C,
The rotation was performed at 100 rpm. Methylal dissolved in trioxane. Further, a premixing zone was provided so that 1,3-dioxolane and the catalyst solution were premixed immediately before being supplied to the polymerization machine. The polymer is 2 as a fine white powder.
It was obtained at 2.4 kg / h.

For 5 kg of the fine powder thus obtained, 9.0 g of “Sanol” LS765 [Sankyo Pharmaceutical Co., Ltd.
Bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate] in 50 ml of benzene was added and stirred in a Henschel mixer for 3 minutes to deactivate the catalyst. Irganox "245 [Ciba-Geigy, triethylene glycol-bis @ 3- (3
-T-butyl-5-methyl-4-hydroxyphenyl)
Propionate} 25g, calcium stearate 5
g was added and heated and melted at 210 ° C. for 5 minutes to obtain P-1.

Method for Producing Oxymethylene Homopolymer (P-3) A polymerization reaction tank having a diameter of 30 cm and a depth of 3 meters and having a stirring blade formaldehyde supply nozzle at the bottom was filled with n-hexane. 0.5 parts by weight of di-n-butyltin dimaleate was dissolved therein, and formaldehyde gas was introduced from a supply nozzle. The formaldehyde gas was obtained by thermally decomposing paraformaldehyde at 140 to 180 ° C. and then using purified gas, which was introduced at a rate of 1.5 kg / hour. The inside of the polymerization tank was prepared by flowing cold water or hot water through a jacket so that the temperature of the polymerization tank was 50 ° C. Polymer fine particles are gradually generated in the polymerization tank, but the polymer solid content is about 5%.
Extraction of the polymer slurry and supply of the catalyst solution (n-hexane) were performed so as to keep the weight at 0% by weight. The extracted polymer was separated by filtration, washed sufficiently with water, and then washed with 10
Poured into double acetic anhydride. Further, 0.1% by weight of acetic anhydride was added to sodium acetate, and the mixture was heated and stirred at 140 ° C. for 5 hours. After the reaction mixture was cooled to room temperature, the polymer was separated by filtration, washed thoroughly with acetone and water, and dried,
3 was obtained.

The oxazoline compounds, oxazine compounds, hindered phenolic antioxidants, hindered amine compounds, and formaldehyde scavengers used in Examples and Comparative Examples are as follows.

OX-1: 2,2 '-(1,3-phenylene) bis (2-oxazoline).

OX-2: 2,2 '-(1,4-phenylene) bis (2-oxazoline).

OX-3: 2-phenyl-2-oxazoline.

OX-4: 2,2'-tetramethylenebis (2-oxazoline).

OX-5: 2,2 '-(1,3-phenylene) bis (5,6-dihydro-4H-1,3-oxazine).

AO-1: triethylene glycol-bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate] (Ciba Geigy "Irganox" 245).

AO-2: 1,6-hexanediol-
Bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (Ciba Geigy "Irganox" 259).

AO-3: pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] (Ciba Geigy "Irganox" 1010).

AO-4: 2,2'-methylenebis (4
-Methyl-6-t-butylphenol) (Sumitomo Chemical "Sumilyzer" MDP-S).

AO-5: 2,6-di-t-butyl-4
-Methylphenol (Sumitomo Chemical "Sumilyzer" BH
T).

HA-1: bis (1,2,2,6,6-
Pentamethyl-4-piperidinyl) sebacate (Sankyo)
Sanol "LS765".

HA-2: dimethyl succinate 1- (2
-Hydroxyethyl) -4-hydroxy-2,2,6
6-tetramethylpiperidine polycondensate (Ciba-Geigy)
Tinuvin "622LD).

HA-3: N, N'-bis (3-aminopropyl) ethylenediamine 2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidinyl) ) Amino] -6-chloro-1,3,5-triazine condensate (Ciba Geigy "Chimassorb" 119F)
L).

HA-4: poly [｛6- (1,1,3,3)
3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl {2,2,6,6-tetramethyl-4-piperidinyl) imino {hexamethylene} (2,2,6 6-tetramethyl-4-piperidyl)
Imino)｝] (Ciba Geigy "Kimasorb" 944F
L).

TH-1: polyamide 6/66/610
/ 12 quaternary copolymer (copolymer composition 6/66/610/1)
2 = 22/12/16/50 (wt%)).

TH-2: polyamide 6/66/610
/ 12 quaternary copolymer (copolymer composition 6/66/610/1)
2 = 33/17/33/17 (wt%)).

TH-3: melamine.

TH-4: dicyandiamide.

Examples 1 to 17 and Comparative Examples 1 to 6 Stabilizers were added to polyoxymethylene resins P-1 to P-4 at the ratios shown in Tables 1 and 2, and
200-210 ° C / 10m using a 45mm diameter extruder
The mixture was melt-extruded and kneaded at m torr.

[0059]

[Table 1]

[0060]

[Table 2]

However, the hindered phenol compound and the hindered amine compound added to P-1 are the same as those of the above P-
At the time of deactivation of the catalyst and heating and melting shown in the production method of No. 1, "Sanol" LS765 and "Irganox" 245 were added instead. The resulting composition was extruded as a strand and pelletized by a cutter. After drying the pellets at 80 ° C. for 3 hours in a hot air circulating oven,
Molding was performed and used for measurement of mechanical properties. Further, the state of generation of formaldehyde odor during continuous molding was evaluated. Furthermore, the melt retention stability was evaluated using the dried pellets. Tables 3 and 4 summarize these results.

[0062]

[Table 3]

[0063]

[Table 4]

From these results, it is clear that the resin composition of the present invention is extremely excellent in thermal stability.

[0065]

The polyoxymethylene resin composition of the present invention has extremely low formaldehyde odor and mold deposit during molding and is excellent in thermal stability. Therefore, in addition to being excellent in thermal stability, the work environment is extremely good, and long-term continuous production of molded products is possible. Can be used.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C08L 59/00-59/04

Claims (6)

(57) [Claims] 1. An at least one compound selected from the following oxazoline compounds and oxazine compounds with respect to 100 parts by weight of a polyoxymethylene resin.
A polyoxymethylene resin composition containing from 10 to 10 parts by weight. Oxazoline compound 2,2 '-(1,3-phenylene) bis (2-oxazoline
Phosphorus), 2,2 '-(1,4-phenylene) bis (2-
Oxazoline), 2-phenyl-2-oxazoline,
2,2'-tetramethylenebis (2-oxazoline). Oxazine compound 2,2 '-(1,3-phenylene) bis (5,6-diphenyl
Dro-4H-1,3-oxazine), 2,2 ′-(1,
4-phenylene) bis (5,6-dihydro-4H-1,
3-oxazine), 2-phenyl-5,6-dihydro-
4H-1,3-oxazine, 2,2'-tetramethylene
Bis (5,6-dihydro-4H-1,3-oxadi
). 2. The polyoxymethylene resin composition according to claim 1, further comprising the following compounds (A) to (C). (A) 0.01 to 10 parts by weight of a hindered phenol compound having a molecular weight of 400 or more (B) 0.01 to 10 parts by weight of a hindered amine compound having a molecular weight of 400 or more (C) 0.01 to 10 parts by weight of a formaldehyde scavenger 3. The compound of (A) is triethylene glycol-bis [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- ( 3,5-di-t-butyl-4
-Hydroxyphenyl) propionate] and pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate]. Oxymethylene resin composition. 4. The compound of (B) is bis (2,2,6,
6, -tetramethyl-4-piperidinyl) sebacate,
Bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, dimethyl succinate 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-
Tetramethylpiperidine polycondensate, N, N'-bis (3
-Aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidinyl) amino] -6-chloro-1,
3,5-triazine condensate, poly [｛6- (1,1,
3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl {2,2,6,6-tetramethyl-4-piperidinyl) imino {hexamethylene} (2,2 6,6-tetramethyl-4-piperidyl)
The polyoxymethylene resin composition according to claim 2, which is at least one compound selected from imino)｝]. 5. The polyoxymethylene resin composition according to claim 2, wherein the compound (C) is at least one compound selected from polyamide, melamine, and cyanoguanidine. 6. The compound (C) is a polyamide 6/66 /
The polyoxymethylene resin composition according to claim 2, which is a 610/12 quaternary copolymer and / or melamine.