WO2015166603A1

WO2015166603A1 - Agent for treating short-staple fibers and use for said agent

Info

Publication number: WO2015166603A1
Application number: PCT/JP2014/080844
Authority: WO
Inventors: 充宏多田; 裕志小南
Original assignee: 松本油脂製薬株式会社
Priority date: 2014-04-30
Filing date: 2014-11-21
Publication date: 2015-11-05
Also published as: CN105793486A; JP5643910B1; JP2016065322A; CN105793486B

Abstract

The present invention is an agent for treating short-staple fibers, the agent necessarily containing: a compound (E), a compound (D), and a compound (A) that are specific organophosphoric acid compounds; and a compound (B) that is a specific polyoxyalkylene compound. Said agent contains compounds (A), (D), and (E) in specific ratios. The weight ratio (A/B) of compound (A) and compound (B) is 0.01 to 0.07, and the inorganic phosphoric acid weight ratio is 1% or less. Said agent has exceptional coiling properties under high-speed drawing conditions.

Description

Fiber treatment agent for short fibers and use thereof

The present invention relates to a fiber treatment agent for short fibers and use thereof.

The production process of spun yarn includes many spinning processes such as a fiber opening process, a card process, a drawing process, a roving process, a spinning process, and a rewinding process. Synthetic fibers such as polyester, nylon and acrylic, unlike natural fibers such as cotton, do not have oil or fat on the fiber surface, so untreated synthetic fibers lack smoothness and antistatic properties in the spinning process. To do. Accordingly, a fiber treatment agent is generally applied to improve smoothness and antistatic properties.
In recent years, the spinning process has been speeded up from the viewpoint of improving the productivity of spun yarn. For example, in the card process, the conventional spinning speed is about 100 m / min, but the recent spinning speed is 150 m / min or more. In the spinning process, the conventional spindle speed is about 16000 rpm, but the spindle speed in recent years is 20000 rpm or more.
As the speed of the spinning process increases, the fiber-metal friction and the amount of static electricity generated increase, so the need for a fiber treatment agent for short fibers that can cope with the speedup of each spinning process is increasing. Therefore, a fiber treatment agent corresponding to high speed has been developed (Patent Document 1). The fiber treatment agent described in Patent Document 1 has been recognized to improve spinnability in the card process or the spinning process.

Japanese Unexamined Patent Publication No. 2002-30571

However, the short fiber to which the fiber processing agent for high speed described in Patent Document 1 is applied, in the drawing process, if the drawing speed exceeds 500 m / min, coiling failure occurs, and the productivity is lowered. Was.
As a result of investigating the cause of such poor coiling properties, it was found that the high-speed fiber treatment agent described in Patent Document 1 has too low friction between the strip sliver and the coiler plate.
Then, the objective of this invention is providing the fiber treatment agent for short fibers which is excellent in the coiling property in a high-speed kneading | mixing, and the short fiber to which this treatment agent was provided.

As a result of intensive studies, the present inventors have found that the above-described problems can be solved if the fiber treatment agent for short fibers contains a specific organophosphate compound and a specific polyoxyalkylene compound in a specific ratio. I found it. That is, the fiber treatment agent for short fibers of the present invention includes a compound (A) represented by the following general formula (1), a compound (B1) represented by the following general formula (2), and the following general formula (3). A compound (B) that is at least one selected from the compound (B2) represented by the formula (4), a compound (D) represented by the following general formula (4), and a compound represented by the following general formula (5) ( E) and essential
The weight ratio of the compound (A) to the whole nonvolatile content of the treating agent is 1 to 16% by weight,
The weight ratio of the compound (D) to the whole nonvolatile content of the treating agent is 25 to 50% by weight,
The weight ratio of the compound (E) to the entire nonvolatile content of the treating agent is 20 to 40% by weight,
The weight ratio (A / B) of the compound (A) and the compound (B) is 0.01 to 0.70, and the weight ratio of inorganic phosphoric acid to the whole nonvolatile content of the treatment agent is 1% by weight or less. .

(In the formula, ^{R 1} .Q ² is a straight-chain alkyl group .Q ¹ is hydrogen atom, an alkali metal salt or linear alkyl group having 16 to 18 carbon atoms having 16 to 18 carbon atoms, respectively Independently, a hydrogen atom or an alkali metal salt.)

(In the formula, R ² represents an alkyl group, alkenyl group, aryl group or acyl group having 8 to 18 carbon atoms, and may be composed of either a linear or branched structure. PO is an oxypropylene group. , EO represents an oxyethylene group, and A ¹ O represents an oxyalkylene group having 2 or 3 carbon atoms, a, b and c represent the average number of moles added, a being 0 to 10, and b being 0 to 10 , C is 1 to 20. [(PO) _a / (EO) _b ] is a polyoxyalkylene group formed by randomly adding a mole of PO and b mole of EO.)

(In the formula, A ² O is an oxyalkylene group having 2 or 3 carbon atoms, m and n are the average number of added moles of the oxyalkylene group, and m + n is a number from 2 to 20. R ³ is the number of carbon atoms. (8 to 16 alkyl groups, alkenyl groups or aryl groups, each of which may be composed of a linear or branched structure)

(In the formula, R ⁴ is a linear alkyl group having 16 to 18 carbon atoms. R ⁵ is a linear alkyl group having 16 to 18 carbon atoms. M ¹ is a hydrogen atom or an alkali metal salt. )

(Wherein R ⁶ is a linear alkyl group having 16 to 18 carbon atoms. M ² and M ³ are each independently a hydrogen atom or an alkali metal salt.)

R ² is preferably an alkyl group, alkenyl group or aryl group having 8 to 18 carbon atoms.
The compound (B) is the compound (B1), and the A ¹ O is preferably an oxyethylene group.
The moisture absorption rate of the non-volatile content of the treatment agent is preferably 1 to 15% by weight.
The a is preferably 1 to 10 and the b is 1 to 10.
It is preferable that the weight ratio of the alkyl phosphate ester potassium salt having 6 to 8 carbon atoms in the entire nonvolatile content of the treatment agent is less than 3% by weight.

The short fiber of the present invention is one in which the fiber treatment agent is applied to the fiber body.

The short fiber to which the fiber treatment agent for short fibers of the present invention is applied is excellent in coiling property at high-speed kneading. The short fiber of the present invention is excellent in productivity since it is excellent in coiling property in high-speed kneading.

The schematic diagram explaining the strip evaluation method. Schematic drawing explaining the criteria for judging the evaluation of the strips.

The fiber treatment agent for short fibers of the present invention essentially contains the compound (A), the compound (B), the compound (D) and the compound (E), and the compound (A) and the compound (B) at a specific ratio. It contains. This will be described in detail below.

[Compound (A)]
The compound (A) is an essential component for the present invention. Compound (A) has a solid dry property and is excellent in hygroscopicity. Many of the solids tend to have insufficient convergence, but the compound (A) has excellent hygroscopicity even though it is a solid, and therefore has adequate convergence.
The drawing coiling property, which is the subject of the present invention, requires low friction between the drawing sliver and the coiler plate, and moderate fiber-fiber friction for maintaining the sliver shape. When a certain amount of the compound (A) is contained in the fiber treatment agent, the fiber to which the treatment agent is applied is excellent in drawing coiling properties. When the compound (A) is not contained at all, the fiber-fiber friction is too low and the coiling property of the drawing is reduced. When the compound (A) is contained in a certain amount, the fiber-fiber friction and Due to the high fiber-metal friction, the coiling property of the drawing is reduced.

The reason why the compound (A) is excellent in hygroscopicity is not clear, but since it has a structure in which a polar group-containing compound such as water is easily coordinated, it is presumed that it is particularly easy to retain moisture.
The reason why the compound (A) is excellent in convergence is not clear, but compared with the monoalkyl phosphate phosphate salt which is the compound (E) described later and the dialkyl phosphate phosphate salt which is the compound (D) described later, the compound (A ) Is large, it is assumed that the intermolecular force for converging the fibers is large.

The compound (A) is represented by the general formula (1).
In the general formula (1), R ¹ is a linear alkyl group having 16 to 18 carbon atoms. Examples of the alkyl group include a hexadecyl group, a heptadecyl group, and an octadecyl group, and an octadecyl group is preferable from the viewpoint of strip coiling properties. If R ¹ is less than 16, the friction is too low, which is unsuitable from the viewpoint of drawing coiling properties. If R ¹ is more than 18, the friction is too high, which is unsuitable from the viewpoint of drawing coiling properties.
In the general formula (1), Q ¹ is a hydrogen atom, an alkali metal salt or a linear alkyl group having 16 to 18 carbon atoms. Examples of the alkali metal salt include potassium salt and sodium salt, and potassium salt is preferable from the viewpoint of strip coiling property.
In general formula (1), Q ² is a hydrogen atom or an alkali metal salt. Examples of the alkali metal salt include potassium salt and sodium salt, and potassium salt is preferable from the viewpoint of strip coiling property.

Compound (A) can be detected as follows.
[ ₃₁ P-NMR method]
About 30 mg of the measurement sample non-volatile content was weighed into an NMR sample tube having a diameter of 5 mm, dissolved by adding about 0.5 ml of heavy water (D ₂ O) as a deuterated solvent, and ₃₁ P-NMR measurement apparatus (manufactured by BRUKER) (AVANCE 400, 162 MHz).
The peak of phosphorus element derived from the compound (A) is detected at -5 to -15 ppm.

Specific examples of the compound (A) represented by the general formula (1) include polystearyl phosphate potassium salt, polystearyl phosphate sodium salt, polycetyl phosphate potassium salt and polycetyl phosphate sodium salt. Among these, polystearyl phosphate potassium salt is preferable from the viewpoint of strip coiling property.

[Compound (B)]
The compound (B) is an essential component for the present invention. Since the compound (B) has a function of emulsifying the compound (A), the compound (B) is used in combination with the compound (A) at a specific ratio, so that the compound (A) is uniformly applied on the fiber. can do.
In addition, since compound (B) has an appropriate fiber-to-fiber friction, it is excellent in drawing coiling properties when used in combination with compound (A) at a specific ratio.

Examples of the compound (B) include a compound (B1) described later and a compound (B2) described later.
The compound (B1) is represented by the general formula (2).
In the general formula (2), R ² represents an alkyl group, alkenyl group, aryl group or acyl group having 8 to 18 carbon atoms, and may be composed of either a linear or branched structure.
In the case where R ² is an alkyl group, the number of carbon atoms is 8 to 18, preferably 10 to 16, and more preferably 11 to 15 because the fiber-to-fiber friction is moderate and the drawing coiling property is excellent. preferable.
The alkyl group may be composed of either a straight chain or branched chain structure, but is preferably a mixture of branched and straight chain from the viewpoint of strip coiling.
When R ² is an acyl group, the number of carbon atoms is 8 to 18, preferably 10 to 16, and more preferably 11 to 15 because the fiber-fiber friction is moderate and the coiling property is excellent. preferable.

In the general formula (2), PO is an oxypropylene group, and a represents the average number of moles added of the oxypropylene group. The average added mole number a of the oxypropylene group is 0 to 10, preferably 1 to 10, more preferably 1 to 9, still more preferably 1 to 7, and particularly preferably 2 to 5. When the average number of added moles of oxypropylene groups is more than 10, the fiber-metal friction becomes too high, and the coiling property of the drawing is lowered.

In the general formula (2), EO represents an oxyethylene group, and b represents the average number of added moles of the oxyethylene group. The average added mole number b of the oxyethylene group is 0 to 10, preferably 1 to 10, more preferably 1 to 8, still more preferably 2 to 7, and particularly preferably 3 to 5. If it exceeds 10 moles, the fiber-metal friction becomes too high, and the coiling property of the drawing is lowered.

In the general formula (2), A ¹ O is an oxyalkylene group having 2 or 3 carbon atoms, and the average added mole number c of the oxyalkylene group is 1 to 20, preferably 1 to 12. To 8 is more preferable, and 2 to 5 is more preferable. When the average addition mole number c of the oxyalkylene group is less than 1, the fiber-metal friction is lowered, and the coiling property of the drawing is lowered. When the average addition mole number c of the oxyalkylene group is more than 20, the fiber-metal friction becomes too high, and the coiling property of the drawing is lowered. In the general formula (2), it is preferable that the A ¹ O is an oxyethylene group from the viewpoint of easily obtaining the effect of the present application.

In the general formula (2), when R ² is an alkyl group, an alkenyl group, or an aryl group, and a = 0 and b = 0, the compound (B1) is an alkylene oxide in an alcohol represented by the general formula R ² OH. Can be obtained by adding
In the general formula (2), when R ² is an alkyl group, an alkenyl group or an aryl group, and a = 1 or more and b = 1 or more, the compound (B1) is obtained by randomly adding ethylene oxide and propylene oxide. It can be produced by adding an alkylene oxide. Random addition refers to an addition state in which oxypropylene groups and oxyethylene groups are randomly copolymerized and arranged.
In the general formula (2), when R ² is an acyl group, it is obtained by an ester reaction between a fatty acid represented by the general formula R ² OH and a corresponding polyalkylene glycol.

In the general formula (2), when R ² is an alkyl group, alkenyl group or aryl group, the R ² OH includes octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, penta Linear alcohols such as decanol, hexadecanol, heptadecanol, octadecanol; 2-ethylhexanol, 2-propylheptanol, 2-butyloctanol, 2-hexyloctanol, 1-hexylheptanol, isodecanol, iso Branched alkanols such as tridecanol, 3,5,5-trimethylhexanol; octenol, nonenol, decenol, undecenol, dodecenol, tridecenol, tetradecenol, pentadecenol, hexadecenol, heptadeceno Le, linear alkenol such octadecenol; octylphenol include nonylphenol, and the like. These alcohols may be used alone or in combination of two or more. Specific examples of alcohol products are not particularly limited. For example, higher alcohols derived from natural fats and oils such as coconut alcohol and palm alcohol, the calcoal series (made by Kao), the conol series (made by Shin Nippon Rika), oxo Examples include the Cole series (manufactured by Kyowa Hakko Chemical), the Neodoll series (manufactured by Shell Chemical), the SAFOL series (manufactured by Sasol), the ALFOL series (manufactured by Sasol), the EXXAL series (manufactured by Exxon Mobil). These higher alcohol products may be used alone or in combination of two or more.
In the general formula (2), when R ² is an acyl group, the R ² OH includes caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, myristoleic acid, pentadecanoic acid, palmitic acid. Acid, palmitoleic acid, isocetyl acid, margaric acid, stearic acid, isostearic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, linolenic acid, etc. may be mentioned, and these may be used alone or in combination of two or more Good.

Specific examples of the compound (B1) include PO (1) / EO (2) -EO (4) -octyl ether, PO (1) / EO (2) -EO (5) -decyl ether, PO (2) / EO (3) -EO (6) -dodecyl ether, PO (2) / EO (3) -EO (7) -tetradecyl ether, PO (3) / EO (4) -EO (8) -hexadecyl Ether, PO (3) / EO (4) -EO (9) -octadecyl ether, PO (1) / EO (2) -EO (4) -2-ethylhexyl ether, PO (1) / EO (2)- EO (4) -3,5,5-trimethylhexyl ether, PO (1) / EO (2) -EO (5) -2-propylheptyl ether, PO (2) / EO (3) -EO (6) -2-butyloctyl ether, PO (2) / EO (3) -EO ( ) -2-hexyloctyl ether, PO (2) / EO (4) -EO (2) -isododecyl ether, PO (2) / EO (4) -EO (2) -isotridecyl ether, PO (3 ) / EO (3) -EO (6) -isocetyl ether, PO (3) / EO (3) -EO (6) -isostearyl ether, PO (10) / EO (10) -EO (20)- Octyl ether, PO (10) / EO (10) -EO (20) -dodecyl ether, PO (10) / EO (10) -EO (20) -hexadecyl ether, EO (5) -octyl ether, EO ( 7) -decyl ether, EO (10) -dodecyl ether, EO (15) -tetradecyl ether, EO (20) -hexadecyl ether, EO (10) -nonylphenyl ether, EO (10) Rail ether, EO (8) stearyl ether, PEG (400) monolaurate, PEG (600) monolaurate, PEG (600) monooleate and the like, may be used alone or one or two. Among them, PO (2) / EO (3) -EO (7) -tetradecyl ether, PO (2) / EO is preferable because the fiber-fiber friction is moderate and the coiling property is excellent. (3) -EO (6) -dodecyl ether, PO (2) / EO (4) -EO (2) -isododecyl ether, PO (2) / EO (4) -EO (2) -isotridecyl ether Is preferred.
The EO (10) means polyoxyethylene (10 mol), the PO (2) means polyoxypropylene (2 mol), and the PO (2) / EO (3) means Mean random addition of polyoxyethylene (3 mol) and polyoxypropylene (2 mol).
The PEG (400) means polyethylene glycol (molecular weight 400).

[Polyoxyalkylene alkylamino ether (B2)]
The fiber treatment agent of the present invention may contain a compound (B2) (hereinafter sometimes referred to as compound (B2)) which is a polyoxyalkylene alkylamino ether represented by the following general formula (3). . The compound (B2) has a function of emulsifying the compound (A) and an antistatic property. It is estimated that the reason why the compound (B2) has an excellent function of emulsifying the compound (A) is that the unshared electron pair of the amino group is coordinated to the hydroxyl group or alkali metal salt of the compound (A). .

In general formula (3), examples of R ³ include octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, and hexadecyl group. One type or two or more types are used in combination. May be.

In the general formula (3), the average added mole number (m + n) of the oxyalkylene group is preferably 2 to 20, more preferably 3 to 18, still more preferably 5 to 15, and particularly preferably 7 to 12. If it exceeds 20, the friction between the fiber and the metal becomes too high, so that the coiling property may be lowered. If it is less than 2, it is difficult to dissolve in water, and the effects of the present application may not be obtained.

In the general formula (3), A ² O is an oxyalkylene group having 2 or 3 carbon atoms. Random addition of oxyethylene / oxypropylene or block addition may be used. A ² O is preferably an oxyethylene group from the viewpoint of more exerting the effect of the present application.

[Compound (D)]
Compound (D) is a dialkyl phosphate ester and / or a dialkyl phosphate ester salt.
The compound (D) has a high fiber-fiber friction, and when the compound (D) is contained in a certain amount in the fiber treatment agent, the treatment agent can impart an appropriate fiber-fiber friction to the fiber. , It will have excellent coiling properties.

In the general formula (4), R ⁴ and R ⁵ are each independently a linear alkyl group having 16 to 18 carbon atoms. Examples of the alkyl group include a hexadecyl group, a heptadecyl group, and an octadecyl group, and an octadecyl group is preferable from the viewpoint of strip coiling properties.
In General Formula (4), M ¹ is a hydrogen atom or an alkali metal salt. Examples of the alkali metal salt include potassium salt and sodium salt, and potassium salt is preferable from the viewpoint of strip coiling property.

Compound (D) can be detected by the ₃₁ P-NMR method in the same manner as compound (A).
The peak of phosphorus element derived from the compound (D) is detected at +4 to -1 ppm. The peak of phosphorus element derived from compound (D), compound (E) and inorganic phosphoric acid is detected at +4 to −1 ppm, but from the low magnetic field side, inorganic phosphoric acid, compound (E), compound (D ) Is determined in the order.

Specific examples of the compound (D) represented by the general formula (4) include distearyl phosphate potassium salt, distearyl phosphate sodium salt, dicetyl phosphate potassium salt and dicetyl phosphate sodium salt. Of these, distearyl phosphate ester potassium salt is preferable from the viewpoint of strip coiling properties.

[Compound (E)]
Compound (E) is a monoalkyl phosphate ester salt and / or a monoalkyl phosphate ester. Compound (E) has a moderately low fiber-fiber friction and is contained in a certain amount in the fiber treatment agent, so that the treatment agent can impart an appropriate fiber-fiber friction to the fiber. As a result, the drawing coiling property is excellent.

In general formula (5), R ⁶ is a linear alkyl group having 16 to 18 carbon atoms. Examples of the alkyl group include a hexadecyl group, a heptadecyl group, and an octadecyl group, and an octadecyl group is preferable from the viewpoint of strip coiling properties.
In General Formula (5), M ² and M ³ are each independently a hydrogen atom or an alkali metal salt. Examples of the alkali metal salt include potassium salt and sodium salt, and potassium salt is preferable from the viewpoint of strip coiling property.

Specific examples of the compound (E) represented by the general formula (5) include monostearyl phosphate potassium salt, monostearyl phosphate sodium salt, monocetyl phosphate potassium salt and monocetyl phosphate sodium salt. Among these, monostearyl phosphate potassium salt is preferable from the viewpoint of strip coiling property.

Compound (E) can be detected by the ₃₁ P-NMR method in the same manner as compound (A).
The peak of phosphorus element derived from the compound (E) is detected at +4 to -1 ppm. The peak of phosphorus element derived from compound (D), compound (E) and inorganic phosphoric acid is detected at +4 to −1 ppm, but from the low magnetic field side, inorganic phosphoric acid, compound (E), compound (D ) Is determined in the order.

[Other ingredients]
The fiber treatment agent of the present invention may contain other components in addition to the compound (A), the compound (B), the compound (D), and the compound (E) described above.
Other components include, for example, water; other surfactants; antifoaming agents; preservatives; fatty acid alkyl esters, paraffin wax, smoothing agents such as dimethylsilicone components, etc., as long as the effects of the present invention are not impaired. Can do. In particular, when used in a finishing process for producing synthetic fibers, the fiber treatment agent of the present invention may further contain a smoothing agent.
Examples of other surfactants include nonionic surfactants other than the compound (B).
Nonionic surfactants other than compound (B) include polyhydric alcohol partial ester type nonionic surfactants such as sorbitan trioleate and glycerol monolaurate, polyoxyalkylene sorbitan trioleate, polyoxyalkylene castor oil, polyoxyalkylene Polyoxyalkylene polyhydric alcohol fatty acid ester type nonionic surfactant such as hydrogenated castor oil trioctanoate, alkylamide type nonionic surfactant such as ethanolamine monolauramide, and polyoxyalkylene such as polyoxyethylenediethanolamine monooleylamide Examples include fatty acid amide type nonionic surfactants. The fiber treatment agent of the present invention is preferably an aqueous liquid (emulsion) further containing water in terms of appearance stability and fluidity.

When the fiber treatment agent of the present invention is an aqueous liquid, the blending ratio of the total amount of the compound (A), the compound (B), the compound (D) and the compound (E) in the entire fiber treatment agent is not particularly limited. However, it is preferably 0.01 to 20% by weight, more preferably 0.02 to 10% by weight, and still more preferably 0.1 to 5% by weight.

When the blending ratio of the total amount of the compound (A), the compound (B), the compound (D) and the compound (E) in the entire fiber treatment agent is less than 0.01% by weight, desired performance cannot be obtained. In some cases, since a higher liquid content (ratio of the weight of the fiber treatment agent to be fed to the fiber weight) is required in the fiber treatment agent refueling step, dripping may increase. On the other hand, if it exceeds 20% by weight, the stability of the fiber treatment agent becomes poor, precipitation of the compound (A) is likely to occur, and the solution may be thickened.

[Fiber treatment agent for short fibers]
The fiber treatment agent for short fibers of the present invention is a fiber treatment agent for imparting to raw material short fibers to which no treatment agent is imparted.
The fiber length of the raw material short fibers is preferably 9 to 64 mm, more preferably 13 to 51 mm, still more preferably 20 to 44 mm, and particularly preferably 31 to 38 mm. If the fiber length is less than 9 mm and more than 64 mm, the high-speed drawing coiling property may be lowered.
The thickness of the raw short fiber is generally expressed in units of decitex (hereinafter expressed as dtex), preferably 0.7 to 4.0 dtex, more preferably 0.8 to 3.0 dtex, and 0.0. 9 to 2.0 dtex is more preferable, and 1.0 to 1.5 dtex is particularly preferable. If it is less than 0.7 dtex, the card passing property is lowered, so that the high-speed drawing coiling property may be lowered. If it exceeds 4.0 dtex, the focusing property is lowered, so that the high-speed drawing coiling property may be lowered.

In the fiber treatment agent for short fibers of the present invention, the weight ratio of the compound (A) to the whole nonvolatile content of the treatment agent is 1 to 16% by weight, preferably 3 to 15% by weight, and preferably 5 to 14% by weight. More preferably, it is 7 to 13% by weight, further preferably 9 to 12% by weight. If it is less than 1% by weight, the effect of the compound (A) is not exhibited, and the strip coiling property is lowered. If it exceeds 16% by weight, the friction between the coiler plate and the fiber becomes high, so that the coiling property of the drawing is lowered.
The non-volatile content in the present invention refers to an absolutely dry component when the treatment agent is heat treated at 105 ° C. to remove the solvent and the like and reach a constant weight.

The weight ratio (A / B) of the compound (A) and the compound (B) is 0.01 to 0.7, preferably 0.01 to 0.6, more preferably 0.03 to 0.6. 0.07 to 0.6 is more preferable, 0.1 to 0.5 is particularly preferable, and 0.2 to 0.4 is most preferable. If it is less than 0.01, since the weight of the compound (A) is small, the effect of improving the strip coiling property cannot be obtained. If it exceeds 0.7, emulsification of the compound (A) by the compound (B) becomes insufficient, and the effect of strip coiling property cannot be obtained.

In the fiber treatment agent for short fibers of the present invention, the weight ratio of inorganic phosphoric acid to the entire nonvolatile content of the treatment agent is 1% by weight or less, preferably 0.8% by weight or less, and more preferably 0.5% by weight or less. , Less than 0.3% by weight is particularly preferred. A preferred lower limit is 0% by weight. If the inorganic phosphoric acid content exceeds 1% by weight, the affinity with rubber and metal is strong, so that in the drawing process, it adheres to and accumulates on the drawing coiler plate, and the friction between fiber and metal increases rapidly. Coiling performance decreases.

Inorganic phosphoric acid can be detected by the ₃₁ P-NMR method as in the case of the compound (A).
The peak of phosphorus element derived from inorganic phosphoric acid is detected at +4 to -1 ppm. The peak of phosphorus element derived from compound (D), compound (E) and inorganic phosphoric acid is detected at +4 to −1 ppm, but from the low magnetic field side, inorganic phosphoric acid, compound (E), compound (D ) Is determined in the order.

In the fiber treatment agent for short fibers of the present invention, the moisture absorption rate of the nonvolatile component of the treatment agent is preferably 1 to 15% by weight, more preferably 2 to 13% by weight, and more preferably 3 to 11% by weight. Further preferred is 4 to 9% by weight. In this order, the fiber-to-fiber friction of the spinning treatment agent becomes appropriate, and thus the coiling coiling property is excellent. If the moisture absorption rate is less than 1% by weight, the fiber-to-fiber friction is too low and the effects of the present application may not be exhibited. If it exceeds 15% by weight, the fiber-fiber friction is so high that the effects of the present application may not be exhibited.
The moisture absorption rate of the non-volatile content of the treating agent here is measured as follows.
(A) Prepare an absolutely dry glass petri dish with a diameter of 6 cm and measure the weight (W1)
(Ii) 20 g of an aqueous solution of a fiber treatment agent having a nonvolatile content of 5% by weight is put in the petri dish, and then air-dried for 3 days, and then absolutely dried at 105 ° C. for 2 hours to obtain an absolutely-dried treatment agent. This weight (absolutely dried treatment agent + glass petri dish) is measured (W2).
(C) The completely dried treatment agent is allowed to stand for 3 days in an environment of 20 ° C. and 65% RH to obtain a moisture-absorbing treatment agent. This weight (moisture absorbing treatment agent + glass petri dish) is measured (W3).
The moisture absorption rate is calculated as the following formula (1).
Moisture absorption rate (% by weight) = (W3-W2) / (W2-W1) × 100 (1)

The treatment agent occupies the entire nonvolatile content of the treatment agent from the viewpoint that the treatment agent can impart an appropriate fiber-fiber friction to the fiber by being contained in a certain amount in the fiber treatment agent for short fibers of the present invention. The weight ratio of the compound (D) is 25 to 50% by weight, preferably 25 to 45% by weight, and more preferably 30 to 45% by weight.

The treatment agent occupies the entire nonvolatile content of the treatment agent from the viewpoint that the treatment agent can impart an appropriate fiber-fiber friction to the fiber by being contained in a certain amount in the fiber treatment agent for short fibers of the present invention. The weight ratio of the compound (E) is 20 to 40% by weight, preferably 25 to 40% by weight, and more preferably 25 to 35% by weight.

The weight of each compound in the total weight of the compound (A), the compound (D), the compound (E) and the inorganic phosphoric acid is such that the friction between the fiber and the metal becomes an appropriate value, and from the viewpoint of the preferred strip coiling property, As shown.
The weight ratio of the compound (A) is preferably 1 to 25% by weight, more preferably 2 to 25% by weight, based on the total weight of the compound (A), the compound (D), the compound (E) and the inorganic phosphoric acid. It is more preferably 3 to 20% by weight, particularly preferably 4 to 15% by weight, and most preferably 5 to 13% by weight.

The weight ratio of the compound (D) is preferably 20 to 60% by weight, more preferably 25 to 55% by weight, based on the total weight of the compound (A), the compound (D), the compound (E) and the inorganic phosphoric acid. It is more preferably 25 to 50% by weight, and further preferably 25 to 45% by weight.
The weight ratio of the compound (E) is preferably 10 to 50% by weight, more preferably 15 to 45% by weight, based on the total weight of the compound (A), the compound (D), the compound (E) and the inorganic phosphoric acid. More preferably, it is 20 to 40% by weight.
The weight ratio of the inorganic phosphoric acid is preferably 1.0% by weight or less, more preferably 0.5% by weight, based on the total weight of the compound (A), the compound (D), the compound (E) and the inorganic phosphoric acid. More preferably, it is 2% by weight, particularly preferably 0.1% by weight or less.

The fiber treatment agent for short fibers of the present invention is used in at least one step selected from a spinning step, a drawing step and a finishing step for producing a synthetic fiber for short fibers.
The fiber treatment agent for short fibers of the present invention is preferably used for spinning because the effect of the present invention is easily exhibited.

In the fiber treatment agent for short fibers of the present invention, the weight ratio of the alkyl phosphate potassium salt having 6 to 8 carbon atoms in the entire nonvolatile content of the treatment agent is less than 10% by weight from the viewpoint of reducing the coiling property of the drawing. 3 wt% or less is more preferable, 2 wt% or less is more preferable, and 1 wt% or less is particularly preferable. A preferred lower limit is 0% by weight.

[Method for producing fiber treatment agent for short fibers]
The fiber treatment agent for short fibers of the present invention is characterized by containing the compound (A) in a specific ratio, and the method for producing the fiber treatment agent for short fibers of the present invention includes a compound at the time of producing the organic phosphate compound. A method of adjusting the content ratio of (A) and then blending the compound (B) and the like can be mentioned.
Specifically, an organic phosphoric acid compound performs the process (I) which makes an organic hydroxyl compound and phosphoric anhydride react, and obtains a reaction material. Then, the ratio of the compound (A) contained in the organic phosphoric acid compound can be adjusted by performing the step (II) of adding water to the reaction product and hydrolyzing it.
The amount of water added to the reaction product is preferably 0.01 to 1 mol, more preferably 0.03 to 0.8 mol, and even more preferably 0.05 to 0.5 mol with respect to the organic hydroxyl compound. Preferably, 0.07 to 0.3 mol is more preferable. If it is less than 0.01 mol and more than 1 mol, it may be difficult to adjust the amount of the compound (A).

The fiber treatment agent for short fibers of the present invention comprises a liquid mixture obtained by previously mixing an aqueous liquid containing the compound (A), the compound (D), and the compound (E) with the compound (B) and other components, Manufactured by mixing with other components as required.

When the raw material for producing the fiber treatment agent for short fibers of the present invention is handled, stored, transported, etc., the compound (A) is composed of other components (specifically, the compound (B) and as necessary. It is preferable not to coexist with at least one selected from other used components to be used. When a component other than this is coexisted with the compound (A), the product stability of the resulting fiber treating agent of the present invention is deteriorated, and appearance defects such as separation and aggregation may occur over time. In addition, even if a compound (D) and a compound (E) coexist, the product stability of the fiber treatment agent of this invention obtained is favorable, and there is no problem.

[Short fiber]
The short fiber of the present invention is obtained by adding the fiber treatment agent for short fiber of the present invention to the raw short fiber.

The application amount of the fiber treatment agent for short fibers is 0.05 to 2.0% by weight, preferably 0.06 to 1.5% by weight, and 0.07 to 1.0% by weight based on the raw short fibers. % Is more preferable, and 0.08 to 0.7% by weight is most preferable. If it is less than 0.05% and more than 2.0% by weight, the card passing property in the spinning process may be inferior.

The fiber treatment agent for short fibers of the present invention may be adhered to the raw material short fiber main body without being diluted as it is, and diluted with water to a concentration such that the weight ratio of the entire nonvolatile content becomes 0.01 to 10% by weight. And you may make it adhere to the raw material short fiber main body as an emulsion. The step of adhering the fiber treatment agent for short fibers to the raw material short fiber body may be any of the spinning process, drawing process, crimping process, cutting process and the like of the raw material short fiber body. The means for attaching the fiber treatment agent for short fibers of the present invention to the raw short fiber body is not particularly limited, and means such as roller oil supply, nozzle spray oil supply, and dip oil supply may be used. A method for obtaining the desired adhesion rate more uniformly and efficiently may be adopted in accordance with the short fiber manufacturing process and its characteristics. Moreover, as a drying method, you may use the method of drying with a hot air and infrared rays, the method of making it contact with a heat source, and drying.

The raw material short fibers of the present invention include cotton fibers, natural fibers such as bleached cotton fibers, regenerated fibers such as rayon fibers, cupra fibers, acetate fibers, polyolefin fibers, polyester fibers, polyamide fibers, acrylic fibers, polychlorinated fibers. Examples thereof include synthetic fibers such as vinyl fibers and composite fibers composed of two or more kinds of thermoplastic resins. Examples of the polyamide fiber include 6-nylon fiber, 6,6-nylon fiber, and aromatic polyamide fiber.

Examples of the rayon fiber include viscose rayon fiber, strong rayon fiber, high strength rayon fiber, high wet elastic rayon fiber, solvent-spun rayon fiber, and polynosic fiber.
As the combination of the composite fibers, in the case of polyolefin resin / polyolefin resin, for example, high density polyethylene / polypropylene, linear high density polyethylene / polypropylene, low density polyethylene / polypropylene, two types of propylene and other α-olefins are used. Examples thereof include an original copolymer or a terpolymer / polypropylene, linear high-density polyethylene / high-density polyethylene, and low-density polyethylene / high-density polyethylene. In the case of polyolefin resin / polyester resin, for example, polypropylene / polyethylene terephthalate, high-density polyethylene / polyethylene terephthalate, linear high-density polyethylene / polyethylene terephthalate, and low-density polyethylene / polyethylene terephthalate. Moreover, in the case of polyester-type resin / polyester-type resin, copolymer polyester / polyethylene terephthalate etc. are mentioned, for example. Furthermore, the fiber which consists of polyamide-type resin / polyester-type resin, polyolefin-type resin / polyamide-type resin, etc. is mentioned.
Among these, if the raw material fiber is a polyester fiber, if the amount of titanium oxide internally added as a matting agent is not suitable, the raw material fiber tends to be deteriorated, particularly, the coiling property tends to be reduced. A fiber is preferable.
The weight ratio of the titanium oxide contained in the polyester fiber is preferably 1500 to 4000 ppm, more preferably 1700 to 3500 ppm, and still more preferably 2000 to 3000 ppm from the viewpoint that the effect of the present application is more easily exhibited.

The cross-sectional shape of the fiber can be circular or irregular. In the case of an irregular shape, for example, a flat shape, a polygonal shape such as a triangle to an octagon, a T shape, a hollow shape, a multileaf shape, and the like can be used. The cross-sectional structure of the fiber can be exemplified by a sheath core type, a parallel core type, an eccentric sheath core type, a multilayer type, a radiation type, or a sea island type. Or a parallel type is preferable.

The fiber length of the short fiber of the present invention is preferably 9 to 64 mm, more preferably 13 to 51 mm, still more preferably 20 to 44 mm, and particularly preferably 31 to 38 mm. If the fiber length is less than 9 mm and more than 64 mm, the high-speed drawing coiling property may be lowered.
The thickness of the short fiber of the present invention is generally expressed in units of decitex (hereinafter expressed as dtex), preferably 0.7 to 4.0 dtex, more preferably 0.8 to 3.0 dtex, 0 Is more preferably 0.9 to 2.0 dtex, and particularly preferably 1.0 to 1.5 dtex. If it is less than 0.7 dtex, the card passing property is lowered, so that the high-speed drawing coiling property may be lowered. If it exceeds 4.0 dtex, the focusing property is lowered, so that the high-speed drawing coiling property may be lowered.
The short fiber of the present invention is preferably used for spinning from the viewpoint of easily exerting the effect of the present application.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto. In addition, the evaluation items and the evaluation method in each example and comparative example are as follows. In addition, Table 3 summarizes the details and evaluation results of the treatment agents in each Example and Comparative Example. In the description of the treatment agent, the blending ratios all represent weight percent.

_[31 P-NMR measurement method]
The ratio of compound (A), compound (D), compound (E) and inorganic phosphoric acid in the phosphoric acid compound was measured by a ₃₁ P-NMR measurement method.
About 30 mg of the measurement sample non-volatile content was weighed into an NMR sample tube having a diameter of 5 mm, dissolved by adding about 0.5 ml of heavy water (D ₂ O) as a deuterated solvent, and ₃₁ P-NMR measurement apparatus (manufactured by BRUKER) (AVANCE 400, 162 MHz).
The peak of phosphorus element derived from the compound (A) is detected at -5 to -15 ppm.
The peak of phosphorus element derived from compound (D), compound (E) and inorganic phosphoric acid is detected at +4 to −1 ppm, but from the low magnetic field side, inorganic phosphoric acid, compound (E), compound (D ) Is determined in the order.
After the assignment, the ratio of compound (A), inorganic phosphoric acid, compound (E) and compound (D) was calculated from the integral ratio.

[Production Examples 1 to 8]
First, an organic phosphoric acid compound, which is a mixture of compound (A), compound (D), compound (E) and inorganic phosphoric acid, was produced as follows.

(Production Example 1)
Stearyl alcohol 250 g was charged into a 1 liter flask, and while stirring, 52.6 g of phosphoric anhydride (corresponding to 0.40 mol as P ₂ O _{5 with} respect to 1 mol of stearyl alcohol) was gradually added and kept at 80 ° C. Stir for 3 hours. Thereafter, 1.7 g of ion-exchanged water (1) (corresponding to 0.1 mol per 1 mol of stearyl alcohol) was added and stirred at 80 ° C. for 30 minutes to 1 hour. A slightly brown transparent unneutralized product was obtained.
Charge 441.7 g of ion-exchanged water (2) and 106.5 g of 50% weight-concentrated KOH solution into another 1 liter flask, gradually add the unneutralized product while stirring, and add white paste (non-volatile content 40% , Moisture 60%).
When the composition of the white paste was confirmed by ₃₁ P-NMR, the compound (A) was 3% by weight with respect to the total nonvolatile content of the white paste, and the compound (D) was based on the total nonvolatile content of the white paste. It was confirmed that 54.9% by weight, compound (E) was 42% by weight with respect to the entire nonvolatile content of the white paste, and inorganic phosphoric acid was 0.1% by weight with respect to the entire nonvolatile content of the white paste. It was done.

(Production Examples 2 and 3)
The phosphoric acid compounds of Production Example 2 and Production Example 3 were obtained in the same manner as in Production Example 1 except that the amount of ion-exchanged water (1) was changed to the amount shown in Table 1. The ratio of the obtained compound (A), compound (D), compound (E) and inorganic phosphoric acid was as shown in Table 1.

(Production Examples 4 to 6)
The phosphoric acid compounds of Production Examples 4 to 6 were obtained in the same manner as in Production Example 1 except that stearyl alcohol was changed to cetyl alcohol and the amount of ion-exchanged water (1) was changed to the amount shown in Table 1. The ratio of the obtained compound (A), compound (D), compound (E) and inorganic phosphoric acid was as shown in Table 1.

(Production Example 7)
Stearyl alcohol (purity 99% or more) 250 g was charged into a 1 liter flask, and 65.7 g of phosphoric anhydride (corresponding to 0.50 mol as P ₂ O _{5 with} respect to 1 mol of stearyl alcohol) was gradually added while stirring. The mixture was stirred for 3 hours while maintaining 80 ° C. Thereafter, 4 g of ion-exchanged water (1) (corresponding to 0.25 mol with respect to 1 mol of stearyl alcohol) was added and stirred at 80 ° C. for 30 minutes to 1 hour. A slightly brown transparent unneutralized product was obtained.
Charge 457.4 g of ion-exchanged water (2) and 171 g of 50% weight-concentrated KOH solution into another 1 liter flask, gradually add the unneutralized product while stirring, and add white paste (non-volatile content 40%, moisture content) 60%). When the composition of the white paste was confirmed by ₃₁ P-NMR, the ratio of compound (A), compound (D), compound (E) and inorganic phosphoric acid was as shown in Table 1.
(Production Example 8)
Stearyl alcohol (purity 99% or more) 250 g was charged into a 1 liter flask, and 59.3 g of phosphoric anhydride (corresponding to 0.45 mol as P ₂ O _{5 with} respect to 1 mol of stearyl alcohol) was gradually added while stirring. A colorless and transparent unneutralized product was obtained.
Charge 444.4 g of ion-exchanged water (2) and 129.6 g of 50% weight-concentrated KOH solution into another 1 liter flask, gradually add the unneutralized product while stirring, and add white paste (non-volatile content: 40% , Moisture 60%). When the composition of the white paste was confirmed by ₃₁ P-NMR, the ratio of compound (A), compound (D), compound (E) and inorganic phosphoric acid was as shown in Table 1.

The phosphoric acid compounds [compound (A), compound (D), and compound (E)] of the above production example described in Table 1, the compound (B1) described in Table 2, the following compound (B2), and compound (F) and the compound (X) were mixed at the ratios shown in Table 3 and stirred to prepare nonvolatile components of the fiber treatment agents for short fibers of each Example and Comparative Example. The non-volatile component was diluted with ion-exchanged water to obtain a 0.5% concentration emulsion.

A-1 Polystearyl phosphate potassium salt A-2 Polycetyl phosphate potassium salt B2-1 POE (10) alkyl (C _12-13 ) amino ether B2-2 POE (7) alkyl (C _12-13 ) amino ether B2 -3 POE (12) alkyl (C ₁₂ ) amino ether D-1 Distearyl phosphate potassium salt D-2 Dicetyl phosphate potassium salt E-1 Monostearyl phosphate potassium salt E-2 Monocetyl phosphate potassium salt F-1 Paraffin WAX emulsion (melting point 125 ° F.)
F-2 Dimethyl silicone emulsion (Emulsified dimethyl silicone with a viscosity of 350 cSt)
X-1 Polyhexyl phosphate potassium salt X-2 Dihexyl phosphate potassium salt X-3 Monohexyl phosphate potassium salt

Next, 10 kg of raw material polyester short fibers (containing 2000 ppm of TiO ₂ ) of 1.3 dtex × 38 mm that have been degreased in advance and the treatment agent is not attached is used, and the non-volatile content of the treatment agent to the raw material short fibers is 0 The emulsion of the treatment agent was fed so as to be 15% by weight, and the raw cotton was dried at 80 ° C. for 2 hours. The obtained treatment agent-added cotton was subjected to the following evaluations.

[High speed drawing coiling evaluation method]
The treatment-applied cotton was opened with an opener and carded with a card machine to obtain a card sliver.
Under an atmosphere of 30 ° C. × 80% RH, the card sliver was supplied to a drawing machine (Hara Weaving Machine Works) and passed 5 times under the condition of spinning speed = 700 m / min. The coiling property of the obtained strip sliver was visually determined. Judgment criteria are as follows.
A: Appearance is very good A: Disturbances in 1 to 3 places are observed in the coiling foam.
X: Disturbance of four or more places is seen in coiling foam.

[Antistatic evaluation method]
The static electricity amount of the traveling sliver is measured with a Kasuga-type potentiometer at a distance of 1 cm from the traveling sliver 3 cm away from the rubber roller 4 in FIG.
Moreover, the above evaluation criteria set ○ or more as acceptable.
A: Less than 2.0 (kv) (very good)
○: 2.0 or more and less than 10.0 (kv) (good)
×: Over 10 (kv) (defect)

As can be seen from Table 3, in the fiber treatment agents for short fibers of Examples 1 to 13, the weight ratio of the compound (A) in the entire nonvolatile content of the treatment agent is 1 to 16% by weight, The weight ratio of the compound (D) in the total amount is 25 to 50% by weight, the weight ratio of the compound (E) in the non-volatile content of the treatment agent is 20 to 40% by weight, and the compound (A ) And the compound (B) in a weight ratio (A / B) of 0.01 to 0.70 and the amount of inorganic phosphoric acid is 1% by weight or less, the high-speed kneading coiling property was good.
On the other hand, in Comparative Examples 1 to 5, when the compound (D) and the compound (E) which are phosphoric acid compounds are included but the compound (A) is not included (Comparative Example 1), the compound (A) is the whole non-volatile content of the treating agent. When the amount exceeds 30% by weight (Comparative Example 2), when the amount of inorganic phosphoric acid exceeds 1% by weight with respect to the entire nonvolatile content of the treating agent (Comparative Example 3), the compound (A) is If it is contained but the weight ratio (A / B) of the compound (A) and the previous compound (B) is not in the range of 0.01 to 0.70 (Comparative Example 4), the compound (A) is not contained. When only compound (B) was contained (Comparative Example 5), the high-speed kneading coiling property was inferior.

1 Card Kens 2 Card Sliver 3 Guide 4 Nip Roller 5 Coiler Plate 6 Kenjo Ken 7 Rib Sliver 8 Sliver without disturbing coiling foam 9 Sliver with disturbing coiling foam

Since the treatment agent for short fibers of the present invention can impart high-speed drawing coiling properties to short fibers, the short fibers to which the fiber treatment agent for short fibers of the present invention has been imparted rapidly worldwide. Even if it is spun by a high-speed spinning machine, it is finished into a fine spun yarn with excellent yarn quality.

Claims

A fiber treatment agent for short fibers,
At least 1 selected from the compound (A) represented by the following general formula (1), the compound (B1) represented by the following general formula (2), and the compound (B2) represented by the following general formula (3) Containing essentially the compound (B) as a seed, the compound (D) represented by the following general formula (4), and the compound (E) represented by the following general formula (5),
The weight ratio of the compound (A) to the whole nonvolatile content of the treating agent is 1 to 16% by weight,
The weight ratio of the compound (D) to the whole nonvolatile content of the treating agent is 25 to 50% by weight,
The weight ratio of the compound (E) to the entire nonvolatile content of the treating agent is 20 to 40% by weight,
The weight ratio (A / B) of the compound (A) and the compound (B) is 0.01 to 0.70,
The weight ratio of inorganic phosphoric acid in the entire nonvolatile content of the treatment agent is 1% by weight or less,
Fiber treatment agent.

(In the formula, R 1 .Q 2 is a straight-chain alkyl group .Q 1 is hydrogen atom, an alkali metal salt or linear alkyl group having 16 to 18 carbon atoms having 16 to 18 carbon atoms, respectively Independently, a hydrogen atom or an alkali metal salt.)

(In the formula, R 2 represents an alkyl group, alkenyl group, aryl group or acyl group having 8 to 18 carbon atoms, and may be composed of either a linear or branched structure. PO is an oxypropylene group. , EO represents an oxyethylene group, and A 1 O represents an oxyalkylene group having 2 or 3 carbon atoms, a, b and c represent the average number of moles added, a being 0 to 10, and b being 0 to 10 , C is 1 to 20. [(PO) a / (EO) b ] is a polyoxyalkylene group formed by randomly adding a mole of PO and b mole of EO.)

(In the formula, A 2 O is an oxyalkylene group having 2 or 3 carbon atoms, m and n are the average number of added moles of the oxyalkylene group, and m + n is a number from 2 to 20. R 3 is the number of carbon atoms. (8 to 16 alkyl groups, alkenyl groups or aryl groups, each of which may be composed of a linear or branched structure)

(In the formula, R 4 is a linear alkyl group having 16 to 18 carbon atoms. R 5 is a linear alkyl group having 16 to 18 carbon atoms. M 1 is a hydrogen atom or an alkali metal salt. )

(Wherein R 6 is a linear alkyl group having 16 to 18 carbon atoms. M 2 and M 3 are each independently a hydrogen atom or an alkali metal salt.)
2. The fiber treatment agent according to claim 1, wherein R 2 is an alkyl group, alkenyl group or aryl group having 8 to 18 carbon atoms.
The fiber treatment agent according to claim 1, wherein the compound (B) is the compound (B1), and the A 1 O is an oxyethylene group.
The fiber treatment agent according to any one of claims 1 to 3, wherein the moisture content of the non-volatile component of the treatment agent is 1 to 15% by weight.
The fiber treating agent according to any one of claims 1 to 4, wherein the a is 1 to 10 and the b is 1 to 10.
The fiber treatment agent according to any one of claims 1 to 5, wherein a weight ratio of the alkyl phosphate ester potassium salt having 6 to 8 carbon atoms to the entire nonvolatile content of the treatment agent is less than 3% by weight.
A short fiber obtained by applying the fiber treatment agent according to any one of claims 1 to 6 to a fiber main body.