JPH07138815A - Method for treating synthetic yarn - Google Patents

Abstract

PURPOSE:To improve drawing properties, heat resistance, lubricating properties, extreme pressure properties, flexibility and post-processing properties by providing yarn with a specific treating agent at a stage before drawing after spinning in production of thermoplastic synthetic yarn by direct spinning and drawing method. CONSTITUTION:A treating agent to be applied to yarn at a stage before drawing after spinning comprises essential components composed of (A) 75-85wt.% of a smoothing agent component obtained by mixing an ester compound of the formula (R1 and R2 are independently a 7-17C alkyl; (n) is 5-15 integer) with a diester compound of thiodipropionic acid and a 8-20C alcohol in the weight ratio of 2:1 to 1:2, (B) 3-10wt.% of a nonionic activator (20-60wt.% ethylene oxide content) obtained from an adduct of a polyhydric alcohol resin acid ester containing plural OH groups with ethylene oxide, a monocarboxylic acid and a dicarboxylic acid and (C) 0.5-5wt.% of a salt of a 8-20C alcohol phosphate and a 8-20C alkylamine (adduct with 1-10 ethylene oxides).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic fiber treating method which is mainly applied to a process for producing industrial synthetic fibers. More specifically, it has excellent stretchability, heat resistance (smoke emission, stains on hot rollers) and extreme pressure during the fiber production, especially when the fiber is hot-stretched and / or heat-treated, and is free from yarn breakage and fluffing during stretching. The present invention relates to a method for treating synthetic fibers, which is capable of providing treated fibers which are not only small but have excellent flexibility and which can sufficiently exhibit the fiber function in a post-processing step.

[0002]

2. Description of the Related Art Conventionally, various treating agents have been used as needed in the spinning and drawing processes of synthetic fibers, but in recent years, the spinning and drawing speeds have become faster and faster to improve productivity and quality. However, since the temperature of the heating body such as the drawing roller is also increased, it is strongly desired to improve the performance of the synthetic fiber treating agent in the production process such as heat resistance, extreme pressure and lubricity.

In addition, synthetic fiber treating agents are also required to have properties capable of sufficiently exhibiting the characteristics of high-performance synthetic fibers obtained by the treatment.

As a conventional treating agent for synthetic fibers, for example, a composition comprising a thiodipropionic acid ester and a monocarboxylic acid and dicarboxylic acid reaction product of a polyhydric alcohol ethylene oxide adduct is blended,
It is known from JP-A-4-34074.

The synthetic fiber treating agent described in JP-A-4-34074 is specifically a diester compound 75-90 of (A) thiodipropionic acid and a C 12-18 monohydric alcohol. Wt% and (B) polyhydric alcohol ethylene oxide adduct ester, and 25 to 10 wt% of a reaction product of a monocarboxylic acid and a dicarboxylic acid. By using this treating agent, hot stretching and / or heat treatment is performed. The purpose is to eliminate smoking during heating and maintain heat resistance after heat treatment.

However, with the recent development of technology, the drawing speed of the yarn has become higher, so even if the treating agent for synthetic fibers described in JP-A-4-34074 is applied, When the heat treatment temperature is high, the lubricity and heat resistance are insufficient, many yarn breakages occur during drawing, and the heating roller cleaning cycle becomes short,
There was a problem that the operability was reduced.

On the other hand, the synthetic fiber treated with the synthetic fiber treating agent is required to have flexibility of the fiber in order to sufficiently exhibit the high performance fiber function at the stage of being actually used. However, the conventional synthetic fibers treated with the synthetic fiber treating agent have insufficient flexibility, and the objectives of improving the productivity and quality of the fibers cannot be sufficiently achieved.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and in particular, the stretchability and heat resistance (smoke emission when heat-drawing and / or heat-treating a fiber Properties, stains on the hot roller), lubricity and extreme pressure properties, and there are few yarn breakages and fluffs during drawing, as well as excellent flexibility, and the fiber function can be fully exerted in the post-processing step. It is to establish a method for treating synthetic fibers that can provide treated fibers.

[0009]

In order to achieve the above object, the method for treating synthetic fibers of the present invention comprises the steps of producing a thermoplastic synthetic fiber by a direct spinning / drawing method, and after the spinning and before the drawing. I. A smoothing agent component obtained by mixing an ester compound represented by the following general formula (I) and a diester compound of thiodipropionic acid and an alcohol having 8 to 20 carbon atoms in a weight ratio of 2: 1 to 1: 2. 75-95% by weight,

[Chemical 3] (However, in the formula (I), n represents an integer of 5 to 15 and R represents an alkyl group having 7 to 17 carbon atoms.) B. A nonionic activator comprising an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and having an ethylene oxide content of 20 to 60% by weight.
10% by weight, and c. A treatment agent containing 0.5 to 5% by weight of a salt of an alcohol phosphorus oxide having 8 to 20 carbon atoms and an alkylamine or alkylamine ethylene oxide 1 to 10 adduct having 8 to 20 carbon atoms as an essential component is provided. It is characterized by

In addition, the above-mentioned treatment agent (hereinafter referred to as the first treatment agent) is applied in a stage after spinning and before drawing, and after the completion of stretching and before winding the fiber, two or more hydroxyl groups are added. A treating agent comprising an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having, a monocarboxylic acid and a dicarboxylic acid, and a nonionic activator having an ethylene oxide content of 20 to 60% by weight as an essential component (hereinafter referred to as the second (Referred to as a treating agent) is added so that the ratio of the nonionic activator component in the total treating agent applied to the fibers is 15 to 30% by weight.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The method for treating synthetic fibers according to the present invention will be described in detail below.

In the method for treating synthetic fibers according to the present invention, the treating agent applied before the fiber is substantially stretched contains the above-mentioned components (a), (b) and (c) in a specific ratio, Because it has excellent heat resistance, it reduces smoke emission on the heating roller during heat treatment of synthetic fibers, reduces tar adhesion to the heating body, and since it has excellent extreme pressure properties, It does not cause oil film breakage between the metal roller and has excellent lubricity, and the smoothness between the running yarn and the metal roller is good. It is possible to obtain high-quality synthetic fibers without causing yarn breakage or yarn cracking.

The compound represented by the above formula (I) in the (A) smoothing agent component of the above-mentioned first treatment agent is a diester of 1,2-alkanediol and a fatty acid having an alkyl group having 7 to 17 carbon atoms. Specifically, specifically, an ester reaction of a 1,2-alkanediol such as 1,2-octanediol or 1,2-dodecanediol with a fatty acid whose alkyl group has 7 to 17 carbon atoms, or a 1,2-alkane It is obtained by an addition ester reaction of an oxide and the above fatty acid.

In the compound represented by the above formula (I),
If n is less than 5, smoking is likely to occur due to the treating agent in the drawing step, and if it exceeds 15 the lubricity of the treating agent is reduced and yarn breakage is likely to occur during drawing, which is not preferable.

Further, in the compound represented by the above formula (I), when the number of carbon atoms of the alkyl group is less than 7, smoke generation is remarkable in the stretching step and the working environment is deteriorated. Is not preferable, because not only the property is impaired and the drawability is lowered, but also the yarn breakage occurs frequently and the operability tends to deteriorate.

Specific examples of the fatty acid used to obtain the compound represented by the above formula (I) include octylic acid, isooctylic acid, lauric acid, oleic acid and isostearic acid. It is preferable to use an isoalkyl fatty acid such as isooctylic acid or isostearic acid and an unsaturated fatty acid such as oleic acid from the viewpoint of obtaining a desired liquid ester compound.

The thiodipropionic acid diester, which is another component of the above-mentioned (a) smoothing agent component, comprises a diester compound of thiodipropionic acid and an alcohol having 8 to 20 carbon atoms. When it exceeds 20, the lubricity of the treating agent is impaired, and the stretchability is lowered.
This is not preferable because it causes frequent yarn breakage and deteriorates operability.

Among the alcohols having 8 to 20 carbon atoms, oleyl alcohol and isostearyl alcohol are particularly preferably used from the viewpoint of stretchability.

The (a) smoothing agent component comprises the compound represented by the formula (I) and the thiodipropionic acid diester in a weight ratio of 2: 1 to 1: 2, preferably 1: 1. It is obtained by mixing with.

In the above-mentioned (a) smoothing agent component, when the ratio of the compound represented by the above formula (I) exceeds 2: 1, the heat resistance of the treating agent decreases, and when it is less than 1: 2, the treating agent is less than Lubricity decreases, which is not preferable.

The proportion of the above-mentioned (a) smoothing agent component in the total treating agent is 75 to 95% by weight, preferably 80 to 90% by weight.

If the proportion of the above-mentioned (a) smoothing agent component in the total treating agent is less than 75% by weight, the spreading property of the treating agent is lowered and friction is increased, which causes yarn breakage and fluffing. If it exceeds 95% by weight, the sizing property is deteriorated, the yarn breaks at the stretching roller, and the operability is deteriorated, which is not preferable.

The component (b) contained in the first treating agent is composed of an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and has an ethylene oxide content of 20. ~ 60 wt% nonionic activator.

Specific examples of the component (b) include ethylene oxide adducts of glycerin monostearate, hydrogenated castor oil ethylene oxide adducts, castor oil ethylene oxide adducts, sorbitol ethylene oxide adducts and trimethylol. Examples thereof include propane ethylene oxide adducts, and among them, hydrogenated castor oil ethylene oxide adducts are preferably used.

The amount of ethylene oxide added to the component (b) is 20 to 60% by weight in the nonionic activator,
The proportion is preferably 25 to 55% by weight. If the amount of ethylene oxide added is less than 20% by weight, the sizing properties will be insufficient and yarn breakage will tend to occur on the drawing roller.
On the other hand, if it exceeds 60% by weight, the compatibility with the thiodipropionic acid ester component is deteriorated and the function of the first treatment agent is deteriorated, which is not preferable.

Examples of the monocarboxylic acid in the above component (b) include capric acid, lauric acid, stearic acid, oleic acid, erucic acid and isostearic acid. Among them, stearic acid and oleic acid are used. preferable.

Further, examples of the dicarboxylic acid in the component (b) include maleic acid, adipic acid, sebacic acid, dodecanoic acid and the like. Among them, maleic acid and adipic acid are preferably used.

The proportion of the above-mentioned (b) nonionic activator component in the total treating agent is 3 to 10% by weight, preferably 4 to 9%.
% By weight.

When the ratio of the non-ionic activator component (b) to the total treating agent is less than 3% by weight, yarn cracking occurs on the stretching roller to deteriorate the operability, and when it exceeds 10% by weight, Not only is the heat resistance and wettability of the treatment agent reduced, the cleaning cycle of the stretching roller shortened, but also yarn breakage and fluffing frequently occur, which tends to deteriorate operability and yarn quality, which is not preferable.

Further, the component (c) contained in the first treating agent comprises a phosphorus oxide of an alcohol having 8 to 20 carbon atoms and an alkylamine or alkylamine ethylene oxide 1 to 10 adduct having 8 to 20 carbon atoms. It is salt, and (a) above
When used in combination with the component (b) and the component (b), it functions to facilitate cleaning of dirt on the fibers and the stretching roller.

Examples of the alcohol having 8 to 20 carbon atoms in the component (c) include octyl alcohol, 2-ethylhexyl alcohol, lauryl alcohol, cetyl alcohol, isocetyl alcohol, oleyl alcohol and isoeicosanol. .

Here, if the carbon number of the alcohol is less than 8, the molecular weight is small, so that it is volatilized by the heat of the spinning process and causes smoke generation, which deteriorates the environment in the synthetic fiber manufacturing process and is larger than 20. If so, extreme pressure property is lowered, friction between the drawing roller and the yarn is increased, and fluff and yarn breakage tend to occur frequently, which is not preferable.

In the component (c), the alkylamine having 8 to 20 carbon atoms or the alkylamine ethylene oxide 1 to 10 adduct forming a salt with the phosphorus oxide of the alcohol may be octylamine or dodecyl. Examples include amines, lauryl amines, lauryl monomethyl amines, oleyl amines and dimethyl stearyl amines.

When the alkylamine has less than 8 carbon atoms, the odor generated from the treating agent becomes remarkable and the spinning environment is deteriorated, and when it exceeds 20, extreme pressure and lubricity are deteriorated and the operation is deteriorated. It is not preferable because it deteriorates the sex.

When the ethylene oxide adduct of alkylamine is used in the component (c), the number of moles of ethylene oxide added is preferably 1 to 10 moles, particularly 3 to 7 moles.

When the number of moles of ethylene oxide added exceeds 10 moles, the basicity of the amine becomes weak and the amount of amine used increases, so that the amount of phosphorus compound of alcohol relatively decreases and the extreme pressure property is increased. In addition, the lubricity is deteriorated and the operability tends to be deteriorated, which is not preferable.

The use of metal salts of phosphorus compounds, such as sodium salts and potassium salts, has poor compatibility with other processing agent components, and therefore they are deposited on the stretching roller to clean the stretching roller. This is not preferable because it shortens the cycle and lowers the operability.

The proportion (c) of the component (c) in the total treating agent is 0.5 to 5% by weight, preferably 1 to 3% by weight,
If it is less than 0.5% by weight, the effects of extreme pressure and lubricity are insufficient, and if it exceeds 5% by weight, the heat resistance is deteriorated, and the friction coefficient between the yarn and the metal is also increased to increase the yarn breakage. It tends to occur, which is not preferable.

The first treating agent contains the above-mentioned components (a),
In addition to (b) and (c), pH adjusting agents, antistatic agents, viscosity stabilizers, extreme pressure agents, and other adjusting agents can be additionally mixed and used, if necessary. It is desirable that the addition amount of is within the range of less than 10% by weight with respect to the entire treating agent.

As a method of applying the first treating agent to the fiber before being substantially stretched, the treating agent is diluted with a non-aqueous low-viscosity mineral oil or emulsified with water to prepare an emulsion treating agent.
Alternatively, there may be mentioned a method in which a treatment agent as an undiluted solution is prepared and applied to the fibers at a stage before substantial stretching by using a roller oil supply device or a guide oil supply device.

In the present invention, thus, the above-mentioned first treating agent is applied to the fiber which has not been substantially stretched, and then the desired hot stretching and / or heat treatment step is performed, followed by winding to obtain excellent spinnability. Originally, high quality synthetic fibers can be obtained without causing problems such as smoke generation, single yarn breakage and yarn cracking in the drawing process.

Preferably, after the completion of the drawing and before the winding of the fiber, it is composed of an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and A treatment agent (second treatment agent) containing a nonionic activator having an ethylene oxide content of 20 to 60% by weight as an essential component is contained in the whole non-ionic activator component of the above-mentioned nonionic activator component. By giving the proportion of 15 to 30% by weight, a higher quality synthetic fiber can be obtained.

The nonionic activator contained in the second treating agent as an essential component may be the same as or different from the component (b) in the first treating agent.

As described above, the nonionic activator has a function of imparting flexibility to the synthetic fiber, but as described above, the nonionic activator occupying in the first treatment agent to be substantially stretched before stretching. When the amount is large, the heat resistance and wettability of the treatment agent are lowered, and not only the cleaning cycle of the stretching roller is shortened, but also yarn breakage and fluff are frequently generated, which tends to deteriorate the operability and the yarn quality. Therefore, the applied amount is limited to 10% by weight or less, and the flexibility of the obtained fiber is somewhat insufficient.

Further, in order to impart flexibility to the synthetic fiber, it is known that it is effective to use a treating agent such as polyethylene wax, high molecular weight polypropylene oxide / polyethylene oxide copolymer and high molecular weight silicone. However, since all of these treatment agents have poor compatibility with each component of the first treatment agent, even if they are applied to the synthetic fibers after the stretching and before the winding of the fibers, Adhesion is poor, fibers tend to fall off easily and work environment is deteriorated, and sufficient flexibility cannot be imparted to the fibers.

Therefore, in the method of the present invention, a second treatment agent containing the above nonionic activator as an essential component is further added at the stage after the drawing is finished and the heat treatment at high temperature is no longer required until the fiber is wound up. As a result, the proportion of the above-mentioned nonionic activator in the total treatment agent applied to the synthetic fibers is increased, and it is possible to obtain more desirably softened synthetic fibers.

Therefore, in the present invention, the above nonionic activator alone or a mixture with other leveling agents or activators is diluted with a non-aqueous low viscosity mineral oil or emulsified with water to form an emulsion treating agent. Alternatively, it is more desirable to prepare the second treatment agent as it is, and to apply it to the fibers by using a roller oiling device or a guide oiling device at the stage after the completion of stretching and before winding.

In the synthetic fiber obtained by applying the second treatment agent as described above, when the ratio of the nonionic activator component in the total treatment agent applied to the fiber is less than 15% by weight, the fiber is In the post-processing step of the fiber, the flexibility in the post-processing step is still insufficient and the function as the synthetic fiber cannot be sufficiently exerted, and when it exceeds 30% by weight, the adhesiveness of the synthetic fiber increases. In this case, the amount of deposits on the guide and the like increases, and the operability in the post-processing process tends to decrease, which is not preferable.

The method for treating synthetic fibers of the present invention is particularly suitable for producing and processing synthetic fibers for industrial materials having high strength, which are made of thermoplastic synthetic fibers such as nylon and polyester.

As described above, the synthetic fiber obtained by the treatment of the present invention has excellent heat resistance, extreme pressure resistance, lubricity and flexibility, and particularly tire cords, seat belts and heavy cloth. It can be suitably applied to various industrial applications such as fishing nets, ropes, and V-belts.

The constitution and effects of the present invention will be described in more detail below with reference to examples.

[0052]

EXAMPLES The evaluation in each example and each comparative example was performed and displayed by the following method.

Drawability: It is indicated by the number of yarn breakages that occurred while drawing 1 ton of synthetic fiber by weight of polymer.

Smoke emission : Smoke emission on the hot roller during stretching was visually observed. ◯: No smoke generated △: Almost no smoke generated ×: A large amount of smoke generated

Contamination of hot roller : The condition of contamination on the hot roller during stretching was visually observed. ◯: No stains Δ: Almost no stains ×: A lot of stains

Detergency of dirt : The tar-like dirt deposited on the hot roller after stretching for 24 hours was confirmed to be easily wiped off with an alkali cleaner. ○: Easy to wipe △: Partly difficult to wipe ×: Hard to wipe

Odor: A functional evaluation history of the odor generated by the hot roller during stretching was performed.

◯: odor is acceptable x: odor is uncomfortable

Dropping amount of treatment agent : After dropping the spun raw yarn into twisted yarns, the shed substance after weaving with a rapier loom was observed. ◯: Almost no lost material is observed. ×: Many lost material is observed.

Flexibility : Judgment was made on the basis of the feel of the woven fabric woven according to the above-mentioned drop-off amount judgment. ◯: Good flexibility ×: Poor flexibility

[Examples 1 to 3, Comparative Examples 1 to 5] 1000
Denier, 192 filaments of polyethylene terephthalate were melt-spun by a usual method, and 0.5% by weight of a treating agent having the composition shown in Table 1 was applied to the obtained fiber by a roller lubrication method, and then the fiber was not wound. , 240
Two-stage drawing using a hot roller at 0 ° C. was performed for a total draw ratio of 5 times.

[0062]

[Table 1] When each fiber obtained by the above treatment was evaluated as described above, the results shown in Table 2 were obtained.

As is clear from the results of Table 2, Example 1
In Nos. 3 to 3, as compared with Comparative Examples 1 to 5, stretchability, heat resistance, stains on the hot roller, and stain removability are significantly improved.

[0064]

[Table 2] [Examples 4-5, Comparative Examples 6-12] 1000 denier,
192 filaments of polyethylene terephthalate were melt-spun by a usual method, and 0.5 wt% of a treating agent having the composition shown in Table 3 was applied to the obtained fibers by a roller lubrication method, and then 240 Two-stage drawing using a hot roller at 0 ° C. was performed for a total draw ratio of 5 times.

[0065]

[Table 3] When the above evaluations were carried out on the respective fibers obtained by the above treatment, the results shown in Table 4 were obtained.

Comparative Example 8 in Table 4 could not be evaluated because the compatibility of the treating agent was poor.

As is clear from the results in Table 4, Examples 4 to 6 according to the present invention have stretchability and heat resistance as compared with Comparative Examples 6 and 10, and have stretchability as compared with Comparative Example 8. Comparative Example 9
In comparison with Comparative Example 11, the heat resistance is excellent and the odor is less than in Comparative Example 11.

[0068]

[Table 4] [Examples 6 to 9 and Comparative Examples 13 to 17] 1000 denier, 192 filaments of polyethylene terephthalate were melt-spun by a conventional method, and the obtained fibers were treated with the first treatment agent A having the composition shown in Table 5 to After adding 0.4% by weight of each of C (see Table 7 for the treatment agent) by the roller lubrication method, the total draw ratio is 5 times by two-stage drawing using a hot roller at 240 ° C. without winding. Heat stretched.

When each fiber obtained in this case was evaluated as above, the results shown in Table 7 were obtained.

Next, with respect to the fibers in the stage after the drawing and before the winding, the second treatment agents D to D having the composition shown in Table 6 are prepared.
J (see Table 7 for the type of treating agent) was applied by a roller lubrication method in an amount of 0.3% by weight and then wound up.

[0071]

[Table 5]

[Table 6] Next, the obtained fibers were woven by a rapier loom, and the twisting process and the treatment agent falling matter on the loom were observed, and the flexibility of the obtained woven fabric was evaluated. The results are shown in Table 7 together.

As is clear from the results in Table 7, Examples 6 to 9 according to the present invention have better stretchability, heat resistance, dirt on the hot roller, and easier removal of dirt than Comparative Examples 13 to 17. It is remarkably improved, and also in the performance of the finally obtained fiber, the treatment agent does not drop off and the flexibility is far superior.

[0073]

[Table 7]

[0074]

As described above, according to the method for treating synthetic fibers according to the present invention, the stretchability and heat resistance (smoke emission, hot roller contamination), especially when the fiber is heat-stretched and / or heat-treated. In addition, it is possible to obtain a synthetic fiber which is excellent in lubricity and extreme pressure, has less yarn breakage and fluff during drawing, and has excellent flexibility.

Further, not only the productivity of the synthetic fiber is improved, but also sufficient flexibility is imparted, so that the excellent fiber function in the post-processing step can be sufficiently exhibited.

Claims (2)

[Claims] 1. When a thermoplastic synthetic fiber is produced by a direct spinning / drawing method, at the stage after spinning and before stretching, a. A smoothing agent component obtained by mixing an ester compound represented by the following general formula (I) and a diester compound of thiodipropionic acid and an alcohol having 8 to 20 carbon atoms in a weight ratio of 2: 1 to 1: 2. 75 to 95% by weight, (However, in the formula (I), n represents an integer of 5 to 15 and R represents an alkyl group having 7 to 17 carbon atoms.) B. A nonionic activator comprising an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and having an ethylene oxide content of 20 to 60% by weight.
10% by weight, and c. A treatment agent containing 0.5 to 5% by weight of a salt of an alcohol phosphorus oxide having 8 to 20 carbon atoms and an alkylamine or alkylamine ethylene oxide 1 to 10 adduct having 8 to 20 carbon atoms as an essential component is provided. A method for treating synthetic fibers, characterized in that 2. When the thermoplastic synthetic fiber is produced by the direct spinning / drawing method, at a stage after spinning and before stretching, a. A smoothing agent component obtained by mixing an ester compound represented by the following general formula (I) and a diester compound of thiodipropionic acid and an alcohol having 8 to 20 carbon atoms in a weight ratio of 2: 1 to 1: 2. 75-85% by weight, (However, in the formula (I), n represents an integer of 5 to 15 and R represents an alkyl group having 7 to 17 carbon atoms.) B. A nonionic activator comprising an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and having an ethylene oxide content of 20 to 60% by weight.
10% by weight, and c. A treatment agent containing 0.5 to 5% by weight of a salt of an alcohol phosphorus oxide having 8 to 20 carbon atoms and an alkylamine or alkylamine ethylene oxide 1 to 10 adduct having 8 to 20 carbon atoms as an essential component is added. Further, after the drawing is completed and before the fiber is wound, it is composed of an ethylene oxide adduct of a polyhydric alcohol fatty acid ester having two or more hydroxyl groups, a monocarboxylic acid and a dicarboxylic acid, and has an ethylene oxide content of 20 to The treating agent containing 60% by weight of the nonionic activator as an essential component has a proportion of the nonionic activator component in the total treating agent applied to the fiber of 15%.
A method for treating synthetic fibers, characterized in that it is added so as to be 30% by weight.