JPH09268242A - Polyolefin resin composition for fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition excellent in heat resistance and discoloration resistance, capable of producing a fiber obtained by melt spinning having excellent washing resistance and useful for various fibers by blending a stabilizing agent containing a specific oxalic acid dianilide derivative to a polyolefin. SOLUTION: This polyolefin resin composition for fiber is obtained by blending (A) 100 pts.wt. of a polyolefin with (B) 0.01-1 pts.wt. of an oxalic acid dianilide derivative expressed by the formula (R1 is a 1-6C alkoxy; R2 and R4 are each H or t-butyl; R3 is a 1-7C alkyl) (e.g. ethane diamine, etc.), (C) 0.01-1 pts.wt. of a phenol-based antioxidant [e.g. 2,2'-methylene-bis(4-methyl-6-t- butylphenol), etc.], (D) 0.01-1 pts.wt. of a sulfur-based antioxidant [e.g. pentaerythritol-tetrakis(β-lauryl-thiodipropionate, etc.], (E) 0.01-1 pt.wt. of phosphorus-based antioxidant (e.g. trisnonyl phosphite, etc.) and (F) 0.01-1 pts.wt. neutralizer (e.g. calcium stearate, etc.).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polyolefin resin composition for fibers, which is obtained by blending at least five stabilizers containing a specific oxalic acid dianilide derivative in a polyolefin resin, and particularly has excellent wash resistance and The present invention relates to a polyolefin resin composition for fibers having good discoloration resistance.

[0002]

Polyolefins such as polypropylene and high-density polyethylene are deteriorated by the action of heat, light, oxygen, etc. or acid gases such as nitrogen oxides, sulfur oxides, etc.
The resin becomes unusable because it is colored or its mechanical properties deteriorate. For the purpose of preventing deterioration of these resins, many stabilizers have been used singly or in combination of two or more. For example, one or more of phenolic antioxidants, sulfur antioxidants, phosphorus antioxidants, hindered amine stabilizers, calcium stearate, neutralizing agents such as hydrotalcite, etc. may be used in combination. Was there.

[0003]

The conventional stabilization of a polyolefin resin has its effect in general use, but when this polyolefin resin is used as a fiber, the effect is not sufficient. This is because the stabilizer in the polyolefin resin used as the fiber is extracted during repeated washing, and the physical properties after washing, particularly heat resistance, are significantly reduced. Further, there is also a problem in that fibers made of a polyolefin resin using a phenolic antioxidant are discolored by nitrogen oxides.

Therefore, an object of the present invention is to provide a polyolefin resin composition for fibers which is excellent in washing resistance, does not deteriorate in heat resistance, and has good resistance to discoloration with respect to nitrogen oxides.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that dianhydride of oxalic acid can be used as a stabilizer in addition to phenol compounds, sulfur compounds, phosphorus compounds and intermediate compounds. It has been found that the problem of the present invention can be solved by using it together with a solvating agent, and the present invention has been completed.

That is, the polyolefin resin composition for fibers of the present invention comprises (b) the following general formula (I) per 100 parts by weight of (a) polyolefin:

[0007]

Embedded image (In the above formula, R ₁ is an alkoxy group having 1 to 6 carbon atoms, and R _1
2 is a hydrogen atom or a tertiary butyl group, and R ₃ has 1 carbon atom
~ 7 alkyl group, R ₄ is a hydrogen atom or a tertiary butyl group) oxalic acid dianilide derivative 0.01
~ 1 part by weight, and (c) a phenolic antioxidant 0.01
To 1 part by weight, and (d) a sulfur-based antioxidant 0.01 to 1
1 part by weight, (e) 0.01 to 1 part by weight of a phosphorus-based antioxidant, and (f) 0.01 to 1 part by weight of a neutralizing agent are blended.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION [Composition Components] (a) Polyolefin As the polyolefin of the raw material resin of the polyolefin resin composition for fibers of the present invention, ethylene, propylene, butene-1, pentene-1, hexene-1, 4- Examples thereof include homopolymers of α-olefins such as methylpentene-1, copolymers of ethylene and propylene or other α-olefins, and copolymers of two or more kinds of these α-olefins. Of these, polypropylene and polyethylene are particularly preferable.

[0009] As polyethylene, low-pressure method high-density polyethylene (HDPE), high-pressure method low-density polyethylene (L
DPE), Low and medium pressure linear low density polyethylene (LL)
DPE) and the like, but HDPE is preferable among them. HDPE has a density of 0.94 to 0.9.
7 g / cm ³ , melt index (MI) (JISK
7210, 190 ° C., 2.16 kg load) 1 to 70 g /
It is preferably 10 minutes.

The polypropylene is not limited to its homopolymer but may be a random polymer or block copolymer with another α-olefin containing a propylene component in an amount of 50 mol% or more, preferably 80 mol% or more. You can Examples of the comonomer to be copolymerized with propylene include ethylene and other α-olefins, of which ethylene is preferred. As polypropylene, crystalline homopolypropylene or ethylene-propylene random copolymer is particularly preferable.

The crystalline polypropylene preferably has a ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn), which is an index of the molecular weight distribution, in the range of 2 to 15 for fibers. The range of 2 to 10 is more preferable. If the Mw / Mn is less than 2, it becomes difficult to stretch at a high ratio, and if the Mw / Mn exceeds 15, the tensile strength decreases, which is not preferable. Polypropylene for fibers is used in industrial ropes, fibers for reinforcing concrete for building materials, etc., where tensile strength is required, a low value within the above range is used, and heat shrinkage rate of woven fabric, non-woven fabric, clothing, etc. For the purpose of reducing the value, those having a relatively high value within the above range are used.

The molecular weight distribution of the crystalline polypropylene can be adjusted by changing the polymerization conditions during the production of the polypropylene resin.
It can also be prepared by heat treatment in the presence of a decomposer such as an organic peroxide or a sulfur compound. The above treatment may be carried out, for example, by melt-kneading the resin composition in the presence of a decomposer such as a peroxide at 190 to 300 ° C. for 1 to 10 minutes in an extruder.

The organic peroxides that can be used here are t-butyl hydroperoxide, dicumyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, benzoyl peroxide, methyl isobutyl ketone peroxide. Oxide, t-butyl perbenzoate, diisopropyl peroxydicarbonate, vinyl tris (t-butyl peroxy) silane,
2,5-Dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, methyl ethyl ketone peroxide, cumene hydroperoxide , The t
-Butyl peroxy phthalate and the like, and among these, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane or 2,5-dimethyl-2,5-di (t-butylperoxide) Oxy) hexyne-3 is preferred. Examples of sulfur compounds include trilauryl trithiophosphite and tristearyl trithiophosphite.

These decomposers are used depending on the desired molecular weight distribution or melt flow rate, but usually 0.001 per 100 parts by weight of crystalline polypropylene.
Used at a ratio of 0.20 parts by weight.

The crystalline polypropylene has a melt flow rate (MFR) (JIS K7210, 230 ° C., 2.
A load of 16 kg) is preferably 5 to 100 g / 10 minutes, more preferably 8 to 60 g / 10 minutes. MFR
If it is less than 5 g / 10 min, it is difficult to stretch at a high ratio and the effect of improving the tensile strength is insufficient, and if it exceeds 100 g / 10 min, the tensile strength is insufficiently improved when stretched at a high ratio, which is not practical. (B) Oxalic acid dianilide derivative The oxalic acid dianilide derivative in the present invention has the following general formula (I):

[0016]

Embedded image (In the above formula, R ₁ is an alkoxy group having 1 to 6 carbon atoms, and R _1
2 is a hydrogen atom or a tertiary butyl group, and R ₃ has 1 carbon atom
R 7 is an alkyl group of 7 to 7 and R ₄ is a hydrogen atom or a tertiary butyl group).

In the above general formula, preferably R ₁ is an ethoxy group, R ₂ is a hydrogen atom or a tertiary butyl group,
R ₃ is an ethyl group and R ₄ is a hydrogen atom or a tertiary butyl group. Of these, preferred specific examples include ethanediamide, N- (2-ethoxyphenyl) -N '-(2-ethylphenyl), ethanediamide, N- (2-ethoxy-5-t-butylphenyl)-.
N '-(2-ethylphenyl) etc. are mentioned. (C) (d) (e) Antioxidant In the present invention, (c) a phenolic antioxidant, (d) a sulfur antioxidant and (e) a phosphorus antioxidant are used as antioxidants. Compound. (C) Phenolic Antioxidant Examples of phenolic antioxidants include hindered phenolic compounds in which one or two ortho positions with respect to a hydroxyl group are substituted with t-butyl groups and / or methyl groups. . Examples thereof include 2,2'-methylene-bis (4-methyl-6-t-butylphenol),
1,1,3-tris (2-methyl-4-hydroxy-5)
-T-butylphenyl) butane, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) -1,3,5-triazine-2,4,6-
(1H-3H-5H) -trione, pentaerythrityl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], 1,3,5-trimethyl-2,4,6 -Tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, 3,9-bis [1,1-dimethyl-2- {β- (3-t-butyl-4)
-Hydroxy-5-methylphenyl) propionyloxy} ethyl-2,4,8,10-tetraoxaspiro [5.5] undecane, 2,6-diphenyl-4-oftatesiloxyphenol, octadecyl-3- (3 , 5
-Di-t-butyl-4-hydroxyphenyl) propionate, distearyl (3,5-di-t-butyl-4-)
Hydroxybenzyl) phosphonate, 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-
Hydroxyphenyl) propionate], 2,4-bis (n-octylthio) -6- (4-hydroxy-3,5
-Di-t-butylanilino) -1,3,5-triazine, 2,2-thiodiethylenebis [3- (3,5-di-
t-butyl-4-hydroxyphenyl) propionate], 4,4′-thiobis (6-t-butyl-m-cresol), bis [3,3-bis (4-hydroxy-3-).
t-butylphenyl) butyric acid] glycol ester, 4,4′-butylidene bis (6-t-butyl-m-cresol), 2,2′-ethylidene bis (4,4)
6-di-t-butylphenol), bis [2-t-butyl-4-methyl-6- (2-hydroxy-3-t-butyl-5-methylbenzyl) phenyl] terephthalate,
1,3,5-Tris (3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-Tris [(3,5-di-t-butyl-4-hydroxyphenyl) Propionyloxyethyl] isocyanurate,
2-t-butyl-4-methyl-6- (2-acryloyloxy-3-t-butyl-5-methylbenzyl) phenol, triethylene glycol bis [3- (3-t-butyl-4-hydroxy-5) -Methylphenyl) propionate], N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydroxynamide,
Bis (3,5-di-t-butyl-4-hydroxybenzylphosphonate ethyl) calcium, N, N'-bis [3
-(3,5-di-t-butyl-4-hydroxyphenyl) propionyl] hydrazine, 2,2'-oxamide bis [ethyl-3- (3,5-di-t-butyl-4-hydroxyphenyl], etc. (D) Sulfur-based antioxidants Sulfur-based antioxidants include dialkylthiodipropionic acid esters having an alkyl group with 12 to 18 carbon atoms, and alkylthiodipropionic acid polyhydric alcohol esters that are alkyl. Examples of the group include those having 4 to 18 carbon atoms.

As a specific example, pentaerythritol-
Tetrakis (β-lauryl-thiodipropionate),
Distearyl thiodipropionate, dilauryl thiodipropionate, dimyristyl thiodipropionate,
Examples thereof include distearyl thiodipropionate and lauryl stearyl thiodipropionate. (E) Phosphorus-based antioxidant Examples of the phosphorus-based antioxidant include, for example, trisnonylphenylphosphite, tris (mono- and dinonylphenyl) phosphite, tris (2,4-di-t-butylphenyl). Phosphite, di (tridecyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite,
Bis (2,6-di-t-butyl-4-methylphenyl)
Pentaerythritol diphosphite, bis (2,4,
6-tri-t-butylphenyl) pentaerythritol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphite, tetra (tridecyl)
-4,4'-n-butyldenbis (2-t-butyl-5)
-Methylphenol) diphosphite, hexa (tridecyl) -1,1,3-tris (3-t-butyl-4-hydroxy-5-methylphenyl) butanetriphosphite, 2,2'-methylenebis (4,6-di) -T-butylphenyl) octylphosphite, 2,2'-methylenebis (4,6-di-t-butylphenyl) octadecylphosphite, 2,2'-methylenebis (4,6-di-
t-butylphenyl) fluorophosphite, tetrakis (2,4-di-t-butylphenyl) biphenylene diphosphonite, 9,10-dihydro-9-oxa-10
-Phosphaphenanthrene-10-oxide, tetrakis (2,4-di-t-butyl-5-methylphenyl)-
4-4'-biphenylene phosphonite etc. are mentioned. (F) Neutralizer As the neutralizer, metal soap, hydrotalcites,
One type or two or more types of lithium aluminum complex hydroxide salt compounds and the like are used.

Examples of metal soaps include calcium stearate, calcium laurate, calcium ricinoleate, barium stearate, barium laurate, barium ricinoleate, barium naphthenate, zinc stearate, zinc laurate, zinc ricinoleate, tin stearate, Examples include magnesium stearate. Of these, calcium stearate is preferred.

Hydrotalcites are magnesium,
Hydrous basic carbonate of aluminum, obtained as a natural mineral or synthetic. Its composition is Mg ₆ Al ₂ (O
H) ₁₆ CO ₃ .4H ₂ O, the crystallographic properties of which are hexagonal.

Further, as the lithium aluminum complex hydroxide salt compound, the following general formula (II):

[0022]

Embedded image [Al ₂ Li (OH) ₆ ] _n X · m H ₂ O (II) (wherein X is an inorganic or organic anion, and n
Is a valence of the anion (X), and m is an integer of 3 or less).

Specifically, the following lithium aluminum complex hydroxide salt compounds can also be used. That is, as the inorganic or organic anion represented by X in the general formula, carbonic acid, sulfuric acid, chlorine oxyacid (for example, perchloric acid), phosphorus oxyacid (phosphoric acid, phosphorous acid, metaphosphoric acid), etc. are obtained. One or a combination of two or more of the above-mentioned anions is preferable, but acetic acid, propionic acid, adipic acid, benzoic acid, phthalic acid, terephthalic acid, maleic acid,
Anions obtained from fumaric acid, succinic acid, p-oxybenzoic acid, salicylic acid, picric acid and the like can be mentioned.

The composition of the present invention further comprises an ultraviolet stabilizer, an ultraviolet absorber, and an ultraviolet stabilizer within a range that does not impair the effects of the present invention.
Other additives such as lubricants, nucleating agents (clarifying agents), antistatic agents (including surfactants), color pigments, flame retardants, foaming agents, silicone oils, β crystal nucleating agents, inorganic fillers, etc. are required as appropriate. You may add according to. [Blending Ratio of Each Component] In the present invention, the mixing ratio of each component is 100 parts by weight of (a) polyolefin.
The (b) oxalic acid dianilide derivative is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, and the (c) phenolic antioxidant is 0.01 to 1 part by weight, preferably 0.1. The amount of the sulfur-based antioxidant (d) is 0.01 to 1 part by weight, preferably 0.03 to 0.
5 parts by weight of the phosphorus-based antioxidant is 0.01 to 1 part by weight, preferably 0.03 to 0.5 part by weight, and (e) the phosphorus-based antioxidant is 0.01 to 1 part by weight, preferably 0.03. To 0.5 parts by weight and the neutralizing agent are 0.01 to 1 part by weight, preferably 0.03 to 0.5 part by weight.

When the amount of the component (b) is less than 0.01 part by weight, the washing resistance and discoloration resistance are particularly insufficient. On the other hand, if the amount exceeds 1 part by weight, not only is there no further effect, but the physical properties of the resin deteriorate, which is not preferable. When the amounts of the components (c), (d) and (e) are less than 0.01 parts by weight, heat deterioration is prevented.
Especially for fibers, it is not possible to prevent thermal deterioration in the spinning machine and generation of eye blemishes. On the other hand, if the amount exceeds 1 part by weight, the odor becomes strong, which causes a problem in practical use. In particular, if the amount of component (c) exceeds 1 part by weight, discoloration may occur, which is not preferable. Further, when the component (f) is less than 0.01 parts by weight, thermal deterioration is prevented,
In particular, it is not possible to prevent thermal deterioration and the occurrence of eye blemishes in the spinning machine. On the other hand, when the amount exceeds 1 part by weight, the number of yarn breakages increases, especially when spinning a fine system. [Method for Producing Composition] The polyolefin resin composition for fibers of the present invention is used with a oxalic acid dianilide derivative, a phenolic antioxidant, a sulfur antioxidant, a phosphorus antioxidant and a neutralizing agent as needed. It can be obtained by adding other additives, dry blending with a Henschel mixer or the like, melt-kneading with an extruder or the like at a temperature of 150 to 310 ° C., and then granulating. [Production Method of Fiber] The method for producing a fiber from the resin composition of the present invention may be a conventionally known method, for example, using the pellet-like or powder-like polyolefin resin composition obtained above as a raw material, multifilament melting It can be obtained by first spinning an unstretched yarn using a spinning device or a monofilament melt-spinning device, and then stretching it with a stretching device. Stretching is performed by a wet heat stretching method in which a melt-spun unstretched yarn is heated and stretched in a bath or a steam bath filled with boiling water, or preheated using a dry heat stretching roll, and arranged so that the stretching point comes on the dry plate heater. It can be carried out by a method such as a dry heat drawing method in which the drawing apparatus is used to draw at a difference in feed roll speed and draw roll speed. The spinning and drawing steps can also be performed in one step. Melt spinning temperature is 180-310 ° C
Is preferable, and the stretching temperature is preferably 70 to 155 ° C.

[0026]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. The following raw materials and additives were used in the examples and comparative examples. (A) Polyolefin (1) Homopolypropylene (HPP): MFR 20 g /
10 minutes. (2) Ethylene-propylene random copolymer (RC
P): MFR 20 g / 10 min, ethylene content 3% by weight. (B) Oxalic acid dianilide derivative (1) Oxalic acid dianilide derivative (A): ethanediamide,
N- (2-ethoxyphenyl) -N '-(2-ethylphenyl) [Sanduvor VSU (trade name), manufactured by Sandoz] (2) Oxalic acid dianilide derivative (B): ethanediamide,
N- (2-ethoxy-5-t-butylphenyl) -N '
-(2-Ethylphenyl) [Sanduvor EPU (trade name), S
manufactured by andoz] (c) Phenolic antioxidant (1) Ph-1: Irganox 1425WL (trade name), manufactured by Ciba Geigy. (2) Ph-2: Ethaxox 330 (trade name), manufactured by Albemarle. (D) Sulfur-based antioxidant (1) S-1: Seenox 1479S (trade name), manufactured by Cypro Kasei Co., Ltd. [phenolic antioxidant Cyanox 1790 (20
%) And a sulfur antioxidant Seenox 412S (80%)]. (2) S-2: DSTDP, Sumilizer TPS (trade name), manufactured by Sumitomo Chemical Co., Ltd. (E) Phosphorus antioxidant (1) P-1: Ultranox 2879A (trade name), manufactured by GE Plastics [Phosphorus antioxidant Ultranox 626 (90%) and neutralizer MIZUKA
LUC (10%) mixture]. (2) P-2: Sandstab P-EPQ (trade name), manufactured by Sand Co. (F) Neutralizer (1) Ca-ST: calcium stearate, manufactured by Nitto Kasei.

Examples 1 to 7 and Comparative Examples 1 to 6 The components were added and blended in the proportions shown in Table 1, mixed with a Henschel mixer, and then raw material pellets were prepared under the conditions of an extrusion temperature of 230 ° C. This pellet was spun into an undrawn yarn of 8 denier at a spinning temperature of 250 ° C. This unstretched yarn was stretched 4 times with a stretching machine including a 110 ° C. overheated stretched plate to prepare a 2 denier stretched yarn, which was used as a sample. The obtained drawn yarn was evaluated for discoloration resistance, heat resistance and washing resistance (1) and (2), and the results are shown in Table 1.

The evaluation was carried out by the following method. (1) Nitrogen oxide resistance test (Nox resistance) After the undrawn yarn (8 denier) was left in a thermostatic chamber at 20 ° C. for 24 hours, about 30 g of this undrawn yarn was wrapped with gauze and the tip surface of a convection type oil stove It was hung from the support frame so that the sample wrap would come directly 1 m from the above, and the oil stove was burned at this position for 1 hour and exposed to the combustion gas of the yarn. The undrawn yarn after this treatment was visually evaluated in the following 5 grades. Nox resistance evaluation Hue evaluation 5 The hue is the same as before the Nox resistance test, and shows a good hue. 4 A slight change in hue is seen compared to before the Nox resistance test, but there is no yellowing. 3 A slight yellowing occurs compared to before the Nox resistance test. 2 Significant yellowing or pink discoloration occurs compared to before the Nox resistance test. 1 Significant yellowing or pink discoloration occurs compared to before the Nox resistance test. (2) Heat resistance test (heat resistance) The heat resistance was measured for the laundry-treated product and the untreated product, and their heat-resistant lives were compared. Heat resistance was evaluated by collecting 10 g of both untreated yarn and yarn after washing 3 times, put it in a thermostability measurement container (stainless steel container with holes), insert a thermocouple from the top of the container, and set it at 150 ° C. PP when starting in a heat-resistant oven
The heat resistance life of the yarn was measured and compared with the time until the temperature of the yarn starts to generate heat above the specified temperature of 150 ° C. (3) Washing resistance About 20 g of this drawn yarn was sampled and washed according to JIS method and washing test C method. After repeating this washing treatment three times, the heat resistance was measured and the wash resistance was evaluated. (4) Washing resistance Body shampoo (eduate, dibutyl hydroxytoluene, paraoxybenzoic acid ester, methylchloroisothiazolinone, methylisothiazolinone, Lu manufactured by Lever Brothers Limited
x body care shampoo) was added to 1 liter of distilled water to dilute the solution, and 500 ml of the diluted solution was weighed and 10 g of the drawn yarn was dipped. Turn on the magnetic stirrer and spin it for about 5 minutes. The yarn after this treatment is dried in a hot air circulation dryer at 80 ° C. for 1 hour. The heat-resistant life of the dried yarn was measured by the heat-resistant measuring method described above, and the time until the temperature rise of the thermocouple was measured.

[0029]

[Table 1]

[0030]

[Table 2] As is clear from Table 1 above, the fiber made of the composition of the present invention in which the specific oxalic acid dianilide derivative, the antioxidant and the neutralizing agent are blended has good heat resistance and heat resistance after each washing, and thus has good wash resistance. It is also excellent in sex. Furthermore, the Nox resistance is good and there is almost no discoloration. On the other hand, it can be seen that the fiber made of the composition of the comparative example which does not use the specific oxalic acid dianilide derivative is inferior in heat resistance, heat resistance after each washing and Nox resistance.

[0031]

The polyolefin resin composition for fibers of the present invention is excellent in heat resistance and discoloration resistance. In particular, the melt-spun fiber is excellent in washing resistance, has little decrease in heat resistance, has good discoloration resistance, and is stable.

Therefore, the composition of the present invention is useful for various fiber applications.

Claims (1)

[Claims] 1. To (a) 100 parts by weight of polyolefin, (b) the following general formula (I): (In the above formula, R ₁ is an alkoxy group having 1 to 6 carbon atoms, and R _1
2 is a hydrogen atom or a tertiary butyl group, and R ₃ has 1 carbon atom
~ 7 alkyl group, R ₄ is a hydrogen atom or a tertiary butyl group) oxalic acid dianilide derivative 0.01
~ 1 part by weight, and (c) a phenolic antioxidant 0.01
To 1 part by weight, and (d) a sulfur-based antioxidant 0.01 to 1
A polyolefin resin composition for fibers, which comprises 1 part by weight, (e) 0.01 to 1 part by weight of a phosphorus-based antioxidant, and (f) 0.01 to 1 part by weight of a neutralizing agent.