Fiber treatment agent for spun yarn production, aqueous solution of fiber treatment agent for spun yarn production, and fiber

Abstract

To reduce the rate of change in friction of a synthetic fiber to which a fiber treatment agent for spun yarn production has been applied, even after the synthetic fiber has been stored for a long period of time, and to improve the wet friction characteristics of the synthetic fiber to which the fiber treatment agent for spun yarn production has been applied, the emulsion stability of the fiber treatment agent for spun yarn production, and the foam suppressing property of the fiber treatment agent for spun yarn production. [Solution] A fiber treatment agent for spun yarn production contains a phosphoric acid compound (A) and an alcohol (B). In P nuclear NMR measurement after alkali overneutralization pretreatment, when the sum of the P nuclear NMR integral ratios attributable to phosphoric acid ester P1, phosphoric acid ester P2, phosphoric acid ester P3, phosphoric acid ester P4, phosphoric acid ester P5, orthophosphoric acid and its salts is taken as 100%, the P nuclear NMR integral ratio attributable to P4 is 20% to 70% and the P nuclear NMR integral ratio attributable to P5 is 20% to 50%, the value calculated by formula (1) is 8 or less, and the acid value per nonvolatile content is 2.5 to less than 50.

Description

[Technical field]

[0001] The present invention relates to a fiber treatment agent for use in the production of spun yarn, an aqueous solution of the fiber treatment agent for use in the production of spun yarn, and fibers. [Background technology]

[0002] It is generally known that in the manufacturing process of spun yarn, a synthetic fiber spinning and drawing process, a finishing process, etc. are carried out. In addition, in the spinning and drawing process, the finishing process, etc., a treatment is sometimes carried out in which a synthetic fiber treating agent is applied to the surface of the synthetic fiber in order to reduce friction, etc. of the synthetic fiber and improve antistatic properties, etc.

[0003] Conventionally, a synthetic fiber treating agent is known, as disclosed in Patent Document 1. Patent Document 1 describes that the synthetic fiber treating agent contains a surfactant such as a specific alkyl phosphate ester, a polyoxyalkylene alkyl ether, and a monohydric aliphatic alcohol having an alkyl group with 12 to 22 carbon atoms in the molecule. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-223035 A Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, synthetic fiber treatment agents used in the production of spun yarn, i.e., fiber treatment agents for spun yarn production, are required to have a small rate of change in friction of the synthetic fibers even after the synthetic fibers to which the treatment agent is applied are stored for a long period of time.Furthermore, further performance improvements are required in terms of the wet friction characteristics of the synthetic fibers to which the fiber treatment agent for spun yarn production is applied, the emulsion stability of the fiber treatment agent for spun yarn production, and the foam suppression properties. [Means for solving the problem]

[0006] As a result of research aimed at solving the above problems, the present inventors have found that a fiber treatment agent for spun yarn production containing a specific phosphoric acid compound and an alcohol is precisely suitable. Various aspects for solving the above problems will be described below.

[0007] The fiber treatment agent for spun yarn production of Aspect 1 is a fiber treatment agent for spun yarn production that contains the following phosphoric acid compound (A) and the following alcohol (B), and in which, when the fiber treatment agent for spun yarn production is subjected to an alkali overneutralization pretreatment and P nuclear NMR measurement is performed, when the sum of the P nuclear NMR integral ratios attributable to phosphate P1, phosphate P2, phosphate P3, phosphate P4, phosphate P5, orthophosphoric acid and salts thereof is taken as 100%, the P nuclear NMR integral ratio attributable to phosphate P4 is 20% or more and 70% or less, the P nuclear NMR integral ratio attributable to phosphate P5 is 20% or more and 50% or less, and the value calculated by the following mathematical formula (1) is 8 or less, and the acid value per nonvolatile content of the fiber treatment agent for spun yarn production is 2.5 KOH-mg / g or more and less than 50 KOH-mg / g.

[0008] Phosphate compound (A): containing a phosphate ester P3 represented by the following formula (3), a phosphate ester P4 represented by the following formula (4), a phosphate ester P5 represented by the following formula (5), and orthophosphoric acid, and optionally further containing at least one selected from a phosphate ester P1 represented by the following formula (1) and a phosphate ester P2 represented by the following formula (2).

[0009] [ka]

[0010] (In Chemical Formula 1, M 1 ,M 2 ,M 3 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0011] [ka]

[0012] (In Chemical Formula 2, R 1 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 4 ,M 5 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0013] [ka]

[0014] (In Chemical Formula 3, R 2 ,R 3 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 6 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0015] [ka]

[0016] (In Chemical Formula 4, R 4 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 7 ,M 8 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0017] [ka]

[0018] (In Chemical Formula 5, R 5,R 6 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 9 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0019]

number

[0020] Alcohol (B): An aliphatic alcohol with 8 to 18 carbon atoms. A second aspect is the same as the first aspect, in which the value calculated by the formula (1) is 3.5 or less.

[0021] In a third aspect, in the fiber treatment agent for producing a spun yarn according to the first or second aspect, the P nucleus NMR integral ratio attributable to the phosphate ester P3 is 6.5% or more and 40% or less. In aspect 4, in the fiber treatment agent for producing spun yarn according to any one of aspects 1 to 3, the sum of the P nucleus NMR integral ratios attributable to the phosphate ester P2 and the phosphate ester P3 is more than 0% and less than 25%.

[0022] Aspect 5 is a fiber treatment agent for producing spun yarn according to any one of Aspects 1 to 4, in which the content of the phosphoric acid compound (A) and the content of the alcohol (B) is 100 mass%, and the content of the phosphoric acid compound (A) is 85 mass% or more and 99.5 mass% or less, and the content of the alcohol (B) is 0.5 mass% or more and 15 mass% or less.

[0023] A sixth aspect is the fiber treating agent for spun yarn production according to any one of the first to fifth aspects, which satisfies at least one of the following two conditions. Condition 1: The alcohol (B) contains two or more types of alcohols having different carbon numbers.

[0024] Condition 2: Contains a fatty acid (C) having 12 to 20 carbon atoms. A seventh aspect is the fiber treating agent for spun yarn production according to any one of the first to sixth aspects, further comprising the following nonionic surfactant (D).

[0025] Nonionic surfactant (D): At least one selected from polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkenyl esters, polyoxyethylene alkyl phenyl ethers, polyoxyalkylene alkylamines, polyoxyalkylene alkenyl amines, salts of polyoxyalkylene alkylamines and inorganic acids, and salts of polyoxyalkylene alkenyl amines and inorganic acids.

[0026] In aspect 8, the fiber treatment agent for spun yarn production according to aspect 7 contains the phosphoric acid compound (A) in an amount of 25% by mass or more and 80% by mass or less, the alcohol (B) in an amount of 0.5% by mass or more and 10% by mass or less, and the nonionic surfactant (D) in an amount of 15% by mass or more and 74.5% by mass or less, assuming that the content of the phosphoric acid compound (A), the alcohol (B), and the nonionic surfactant (D) is 100% by mass.

[0027] The aqueous solution of the fiber treatment agent for producing spun yarn of aspect 9 is characterized in that the non-volatile content of the fiber treatment agent for producing spun yarn according to any one of aspects 1 to 8 is from 0.1% by mass to 10% by mass.

[0028] The fiber of the tenth aspect is characterized in that the fiber treating agent for producing a spun yarn according to any one of the first to eighth aspects is adhered to the fiber. The fiber of an eleventh embodiment is characterized in that the fiber of the tenth embodiment is a polyester staple fiber. Effect of the Invention

[0029] According to the present invention, it is possible to reduce the rate of change in friction of synthetic fibers having a fiber treatment agent for spun yarn applied thereto, even after the synthetic fibers have been stored for a long period of time, and it is also possible to improve the wet friction characteristics of the synthetic fibers having a fiber treatment agent for spun yarn applied thereto, and the emulsion stability and foam suppression properties of the fiber treatment agent for spun yarn. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] First Embodiment A first embodiment of the fiber treatment agent for spun yarn production (hereinafter, simply referred to as the treatment agent) of the present invention will be described below. The treatment agent of this embodiment contains the following phosphoric acid compound (A) and the following alcohol (B).

[0031] (Phosphate Compound (A)) The phosphoric acid compound (A) contains a phosphoric acid ester P3 represented by the following formula (3), a phosphoric acid ester P4 represented by the following formula (4), a phosphoric acid ester P5 represented by the following formula (5), and orthophosphoric acid, and optionally further contains at least one selected from a phosphoric acid ester P1 represented by the following formula (1) and a phosphoric acid ester P2 represented by the following formula (2).

[0032] [ka]

[0033] (In Chemical Formula 1, M 1 ,M 2 ,M 3 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0034] [ka]

[0035] (In Chemical Formula 2, R 1: an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 4 ,M 5 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0036] [ka]

[0037] (In Chemical Formula 3, R 2 ,R 3 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 6 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0038] [ka]

[0039] (In Chemical Formula 4, R 4 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 7 ,M 8 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium.

[0040] [ka]

[0041] (In Chemical Formula 5, R 5 ,R 6 : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M 9 : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. (alkali metals) In the phosphoric acid compound (A), M 1 ~M 9 The alkali metal constituting the above is not particularly limited, and examples thereof include sodium, potassium, and lithium.

[0042] (Alkaline Earth Metals) M 1 ~M 9 The alkaline earth metal constituting the above metal is not particularly limited, and examples thereof include calcium, magnesium, beryllium, strontium, barium, and the like.

[0043] In addition, the above "alkaline earth metal (1 / 2)" is M because alkaline earth metals are divalent. 1 ~M 9 This means that 1 / 2 mol is added. (Organic amine) M 1 ~M 9 The organic amine constituting the compound is not particularly limited, and examples thereof include primary amines such as methylamine, ethylamine, butylamine, octylamine, laurylamine, octadecylamine (also called stearylamine), octadecenylamine, and coconut amine.

[0044] (Phosphonium) M 1 ~M 9 The phosphonium constituting the formula (I) is not particularly limited, and examples thereof include quaternary phosphoniums such as tetramethylphosphonium, tetraethylphosphonium, tetrabutylphosphonium, tetraoctylphosphonium, dibutyldihexylphosphonium, trihexyltetradecylphosphonium, triethyloctylphosphonium, trioctylmethylphosphonium, and triphenylmethylphosphonium.

[0045] The above M 1 ~M 9 The alkali metals, alkaline earth metals, organic amines, ammonium, and phosphonium constituting the compound may each be used alone or in appropriate combination of two or more kinds.

[0046] (Alkyl group having 16 to 20 carbon atoms) R 1 ~R 6 The alkyl group having 16 to 20 carbon atoms constituting the formula (I) is not particularly limited, and may be a straight-chain alkyl group or a branched-chain alkyl group.

[0047] Specific examples of the straight-chain alkyl group include a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, and an icosyl group. Specific examples of the branched alkyl group include an isohexadecyl group, an isoheptadecyl group, an isooctadecyl group, an isononadecyl group, and an isoicosyl group.

[0048] (Alkenyl group having 16 to 20 carbon atoms) R 1 ~R 6 The alkenyl group having 16 to 20 carbon atoms constituting the formula (I) is not particularly limited, and may be a straight-chain alkenyl group or a branched-chain alkenyl group.

[0049] Specific examples of the straight-chain alkenyl group include a hexadecenyl group, a heptadecenyl group, an octadecenyl group, a nonadecenyl group, and an icosenyl group. Specific examples of the alkenyl group having a branched chain include an isohexadecenyl group, an isoheptadecenyl group, an isooctadecenyl group, an isononadecenyl group, and an isoicosenyl group.

[0050] Above R 1 ~R 6 The alkyl group and alkenyl group each having 16 to 20 carbon atoms may be used alone or in appropriate combination of two or more kinds.

[0051] The orthophosphoric acid contained in the phosphoric acid compound (A) may form a salt. Examples of the salt of orthophosphoric acid include salts with the above-mentioned alkali metals and alkaline earth metals.

[0052] (Method for producing phosphoric acid compound (A)) The method for producing the phosphoric acid compound (A) is not particularly limited, and a known method can be adopted. The phosphoric acid compound (A) can be produced, for example, by reacting an aliphatic alcohol as a raw material with phosphoric anhydride such as diphosphorus pentaoxide to obtain a phosphoric acid oxide (hereinafter also referred to as a phosphorylation reaction), and then neutralizing the obtained phosphoric acid oxide.

[0053] The aliphatic alcohol is R 1 ~R 6 An alcohol having an alkyl or alkenyl group having 16 to 20 carbon atoms can be used. The aliphatic alcohol is preferably dehydrated in advance, since this makes it easier to suppress decomposition of phosphoric anhydride due to moisture in the raw material.

[0054] The reaction atmosphere between the aliphatic alcohol and phosphoric anhydride is not particularly limited, and a nitrogen atmosphere, an air atmosphere, or the like can be adopted. A nitrogen atmosphere is preferred because it makes it easier to suppress decomposition of phosphoric anhydride due to moisture in the reaction atmosphere.

[0055] The conditions for the phosphorylation reaction are not particularly limited, but it is preferable to carry out the reaction at a temperature of 65° C. to 85° C. for 1 hour to 6 hours. It is also preferable to prevent the synthesized phosphoric acid oxide from coming into contact with moisture, since if the phosphoric acid oxide comes into contact with moisture, the phosphoric acid ester P2 and the phosphoric acid ester P3 are likely to decompose.

[0056] The conditions for the neutralization are not particularly limited, but it is preferable to perform the neutralization for 3 to 9 hours at a temperature of 85° C. to 95° C. If the neutralization temperature is less than 85° C., the content of the phosphoric ester P2 tends to be high.

[0057] (Alcohol (B)) The alcohol (B) is an aliphatic alcohol having 8 to 18 carbon atoms. Specific examples of the alcohol (B) include octanol, nonanol, decanol, undecanol, dodecanol (lauryl alcohol), tridecanol, tetradecanol, pentadecanol, hexadecanol (cetyl alcohol), heptadecanol, and octadecanol (stearyl alcohol).

[0058] The alcohol (B) may be a straight-chain aliphatic alcohol or a branched-chain aliphatic alcohol. The alcohol (B) may be used alone as one type of alcohol (B) or in appropriate combination of two or more types of alcohol (B).

[0059] The alcohol (B) preferably contains two or more types of alcohol (B) having different carbon numbers. When two or more types of alcohol (B) having different carbon numbers are contained, the foam suppressing property of the treatment agent can be further improved.

[0060] (Ratio of phosphoric acid compound (A) and alcohol (B)) The content ratio of the phosphoric acid compound (A) and the alcohol (B) in the treatment agent is not particularly limited. When the content ratio of the phosphoric acid compound (A) and the alcohol (B) is 100 mass%, it is preferable that the phosphoric acid compound (A) is contained in a ratio of 85 mass% to 99.5 mass% and the alcohol (B) is contained in a ratio of 0.5 mass% to 15 mass%.

[0061] When the content ratio of the phosphoric acid compound (A) and the alcohol (B) in the treatment agent is within the above numerical range, the foam suppressing property and emulsion stability of the treatment agent can be further improved. (P nucleus NMR integral ratio) In P nuclear NMR measurement after the treatment agent has been pretreated by alkaline overneutralization, when the sum of the P nuclear NMR integral ratios attributable to phosphate P1, phosphate P2, phosphate P3, phosphate P4, phosphate P5, orthophosphoric acid and its salts is taken as 100%, the P nuclear NMR integral ratio attributable to phosphate P4 is 20% or more and 70% or less, and the P nuclear NMR integral ratio attributable to phosphate P5 is 20% or more and 50% or less.

[0062] Moreover, the value obtained from the following formula (1) is not more than 8. The value obtained from the following formula (1) is preferably not more than 3.5.

[0063]

number

[0064] When the value obtained from the formula (1) is 8 or less, the rate of change in friction of the synthetic fiber can be reduced even after the synthetic fiber with the treatment applied thereto is stored for a long period of time. Furthermore, when the value obtained from the formula (1) is 3.5 or less, the rate of change in friction can be further reduced.

[0065] It is believed that the frictional properties of synthetic fibers with a treatment applied to them are largely affected by an increase in orthophosphoric acid due to the decomposition over time of phosphate ester P1 and phosphate ester P2. 2 moles of orthophosphoric acid are generated by decomposition from 1 mole of phosphate ester P1. Also, 1 mole of orthophosphoric acid is generated by decomposition from 1 mole of phosphate ester P2. Therefore, the rate of change in friction of synthetic fibers can be evaluated using the above formula (1), taking into account the effect of the generation of orthophosphoric acid.

[0066] Here, the above-mentioned "alkali overneutralization pretreatment" means a pretreatment in which an excess amount of alkali is added to the phosphate ester or orthophosphoric acid contained in the phosphoric acid compound (A). Specific examples of the alkali include alkali metal hydroxides. The alkali may be the same as or different from the alkali used in synthesizing the salt of the phosphate ester. Specific examples of the alkali metal hydroxide include sodium hydroxide and potassium hydroxide. In the P nuclear NMR measurement, by performing the alkali overneutralization pretreatment, the peaks belonging to the phosphate esters P1 to P5, orthophosphoric acid and its salts can be clearly separated. The method for measuring the P nuclear NMR integral ratio will be described later.

[0067] The P NMR integral ratio attributable to the phosphate ester P3 is preferably 6.5% or more and 40% or less. In addition, the sum of the P nucleus NMR integral ratios assigned to the phosphate esters P2 and P3 is preferably more than 0% and less than 25%.

[0068] When the P nucleus NMR integral ratio assigned to the phosphate ester P3 is 6.5% or more and 40% or less, the emulsion stability can be further improved. In addition, when the total of the P nucleus NMR integral ratios attributable to the phosphate esters P2 and P3 is more than 0% and less than 25%, the friction between the synthetic fiber to which the treatment agent is applied and the metal when wet can be further reduced, in other words, the friction characteristics when wet can be further improved.

[0069] (Acid value of treatment agent) The acid value per non-volatile content of the treatment agent is 2.5 KOH-mg / g or more and less than 50 KOH-mg / g. When the acid value per non-volatile content of the treatment agent is in the above numerical range, the emulsion stability of the treatment agent can be improved.

[0070] The acid value per unit of non-volatile content of the treatment agent is calculated by dissolving the non-volatile content of the treatment agent in a mixed solvent of ethanol / xylene = 1 / 2 (volume ratio), setting it in a potentiometric titrator, and titrating it with a 0.1 mol / L standard solution of potassium hydroxide in methanol using the following formula.

[0071] Acid value (KOH-mg / g)=(R×f×56.11×0.1) / S In the formula, f: Factor of 0.1 mol / L potassium hydroxide methanol standard solution S: Sample amount (g, solid content equivalent) R: Amount of 0.1 mol / L potassium hydroxide methanol standard solution used up to the inflection point (mL) The non-volatile content of the treatment agent refers to the mass of the absolutely dry matter obtained by heat-treating the treatment agent at 105°C until it reaches a constant weight and thoroughly removing volatile substances.

[0072] (Fatty acids with 12 to 20 carbon atoms (C)) The treatment agent may contain a fatty acid (C) having 12 or more and 20 or less carbon atoms. Specific examples of fatty acids (C) include dodecanoic acid (lauric acid), tridecanoic acid, tetradecanoic acid (myristic acid), pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), nonadecanoic acid, and icosanoic acid.

[0073] Regarding the fatty acid (C), one type of fatty acid (C) may be used alone, or two or more types of fatty acids (C) may be used in appropriate combination. When the treatment agent contains a fatty acid (C) having 12 or more and 20 or less carbon atoms, the foam suppressing properties of the treatment agent can be further improved.

[0074] The content of the fatty acid (C) is not particularly limited, but it is preferably contained in an amount of 0% by mass or more and 2% by mass or less in the non-volatile content of the treatment agent. It is preferable that the treatment agent satisfies at least one of the following two conditions.

[0075] Condition 1: Contains two or more types of alcohol (B) having different carbon numbers. Condition 2: Contains a fatty acid (C) having 12 to 20 carbon atoms. When the treatment agent satisfies at least one of the above conditions 1 and 2, the foam suppressing properties of the treatment agent can be further improved.

[0076] (Nonionic surfactant (D)) The treatment agent preferably further contains at least one selected from the following nonionic surfactants (D).

[0077] Specific examples of the nonionic surfactant (D) include polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkenyl esters, polyoxyethylene alkyl phenyl ethers, polyoxyalkylene alkyl amines, polyoxyalkylene alkenyl amines, salts of polyoxyalkylene alkyl amines and inorganic acids, and salts of polyoxyalkylene alkenyl amines and inorganic acids.

[0078] When the treatment agent contains the above-mentioned nonionic surfactant (D), the carding properties of the synthetic fibers to which the treatment agent is attached can be further improved. (Content of phosphoric acid compound (A), alcohol (B), and nonionic surfactant (D)) The content ratios of the phosphoric acid compound (A), the alcohol (B), and the nonionic surfactant (D) in the treatment agent are not particularly limited. When the content ratios of the phosphoric acid compound (A), the alcohol (B), and the nonionic surfactant (D) are taken as 100 mass%, it is preferable that the phosphoric acid compound (A) is contained in an amount of 25 mass% to 80 mass%, the alcohol (B) is contained in an amount of 0.5 mass% to 10 mass%, and the nonionic surfactant (D) is contained in an amount of 15 mass% to 74.5 mass%.

[0079] When the content ratios of the phosphoric acid compound (A), the alcohol (B), and the nonionic surfactant (D) in the treatment agent are within the above numerical ranges, it becomes easy to adjust the acid value of the treatment agent and the value calculated by formula (1) to be within the above numerical ranges.

[0080] (Other ingredients (E)) The treatment agent may contain other components (E) such as stabilizers, antistatic agents, binders, antioxidants, UV absorbers, surfactants other than the nonionic surfactant (D), pH adjusters, and alcohols other than the alcohol (B), which are generally used in treatment agents.

[0081] Specific examples of the other component (E) include polydimethylsiloxane, amino-modified polydimethylsiloxane, and the like. In the non-volatile content of the treatment agent, the content of the other component (E) is preferably 15 mass % or less, more preferably 10 mass % or less, and further preferably 5 mass % or less. The content of the other component (E) may be 0 mass %.

[0082] (Preservation form) The treatment agent may be configured as a one-component type containing the above-mentioned components (A) to (E), or from the viewpoint of improving the formulation stability, it may be configured as a two-component type treatment agent or a three-component type treatment agent.

[0083] (solvent) The treatment agent of this embodiment is mixed with a solvent as necessary to prepare a fiber treatment agent-containing composition for spun yarn production (hereinafter also referred to as a "treatment agent-containing composition"), and the treatment agent may be stored or distributed in the form of a treatment agent-containing composition.

[0084] The solvent has a boiling point of 105° C. or less at 1 atmospheric pressure. Examples of the solvent include water and organic solvents. Specific examples of water include ion-exchanged water, distilled water, hard water, soft water, etc. Among these, it is preferable to use ion-exchanged water or distilled water.

[0085] Specific examples of the organic solvent include lower alcohols such as ethanol and propanol, and low polarity solvents such as hexane. These solvents may be used alone or in combination of two or more. Among these, polar solvents such as water and lower alcohols are preferred from the viewpoint of excellent dispersibility or solubility of each component, and water is more preferred from the viewpoint of excellent handling.

[0086] <Actions and Effects of the First Embodiment> (1-1) The treatment agent of the first embodiment contains the above-mentioned phosphoric acid compound (A) and alcohol (B). In addition, the P nuclear NMR integral ratio attributable to phosphoric acid ester P4 is 20% or more and 70% or less, the P nuclear NMR integral ratio attributable to phosphoric acid ester P5 is 20% or more and 50% or less, the value calculated by the mathematical formula (1) is 8 or less, and the acid value per non-volatile content of the treatment agent is 2.5 KOH-mg / g or more and less than 50 KOH-mg / g. Therefore, even after the synthetic fiber to which the treatment agent is attached is stored for a long period of time, the change rate of friction of the synthetic fiber can be reduced. In addition, the wet friction characteristics of the synthetic fiber to which the treatment agent is attached, the emulsion stability of the treatment agent, and the foam suppression property can be improved.

[0087] (1-2) Furthermore, by containing the above-mentioned nonionic surfactant (D), the carding properties of the synthetic fibers to which the treatment agent is applied can be further improved. (1-3) By using the treatment agent of the first embodiment, it is possible to produce spun yarn that can be suitably used in final products such as clothing.

[0088] <Second embodiment> Next, a second embodiment of the aqueous solution of the fiber treatment agent for spun yarn production (hereinafter, simply referred to as the aqueous solution) of the present invention will be described. The following description will focus on the differences from the first embodiment.

[0089] The aqueous liquid of the present embodiment contains the treatment agent and water. The aqueous liquid is used as an emulsion by mixing the treatment agent and water. Specific examples of water that can be used are the same as the water used as the solvent.

[0090] The method for preparing the aqueous liquid is not particularly limited, and for example, a method of adding a predetermined amount of the treatment agent to a previously measured amount of water can be used. Furthermore, the aqueous liquid can be prepared by a known mechanical emulsification method using a known homomixer, homogenizer, or the like.

[0091] The concentration of the treatment agent in the aqueous liquid is not particularly limited, but the concentration of the treatment agent is preferably, for example, 0.1% by mass or more and 10% by mass or less in terms of the non-volatile content of the treatment agent. When the concentration of the treatment agent in the aqueous liquid is within the above numerical range, emulsion stability is easily improved.

[0092] <Actions and Effects of the Second Embodiment> In addition to the actions and effects of the first embodiment, the second embodiment has the following actions and effects.

[0093] (2-1) The aqueous liquid of the second embodiment contains the treatment agent and water. Therefore, the treatment agent can be applied in the form of an emulsion to synthetic fibers for spun yarn production. In addition, the aqueous liquid is easy to handle by containing water as a solvent.

[0094] <Third embodiment> Next, a third embodiment of the fiber of the present invention will be described. The fiber of this embodiment is a treated fiber having the treatment agent of the first embodiment adhered to its surface. By adhering the treatment agent to the fiber surface, a fiber exhibiting the effects of the present invention is obtained.

[0095] The type of fiber is not particularly limited, and examples thereof include (1) polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-isophthalate, polyether polyester, polylactic acid, and composite fibers containing these polyester resins, (2) polyamide fibers such as nylon 6 and nylon 66, (3) polyacrylic fibers such as polyacrylic and modacrylic, and (4) polyolefin fibers such as polyethylene and polypropylene. Among these, polyester fibers are preferable.

[0096] The length of the fiber is not particularly limited, but is preferably applied to short fibers, that is, the fiber of the present embodiment is preferably a polyester short fiber. The length of the short fibers is not particularly limited as long as it corresponds to short fibers in the present technical field, but is, for example, 100 mm or less.

[0097] (Treatment agent attachment treatment) There is no particular limit to the ratio at which the treatment agent of the first embodiment is applied to the fiber. The treatment agent is applied so that the non-volatile content of the treatment agent is preferably 0.01% by mass to 10% by mass, more preferably 0.1% by mass to 3% by mass, relative to the fiber. With this configuration, the efficacy of each component can be effectively exerted. There is no particular limit to the method of applying the aqueous liquid, and known methods such as roller oiling, guide oiling using a metering pump, immersion oiling, and spray oiling can be used depending on the type, form, and use of the fiber. When the immersion oiling method is used, the immersion time is preferably 1 minute to 5 minutes.

[0098] The fibers to which the aqueous liquid has been applied may be dried or heated using a known method. The solvent such as water is evaporated by the drying or heating treatment, and a fiber to which the components contained in the treatment agent are attached is obtained. The fiber to which the components in the treatment agent are attached can effectively exert its efficacy for spun yarn production.

[0099] <Actions and Effects of the Third Embodiment> (3-1) The polyester staple fiber is coated with the treatment agent of the first embodiment. Therefore, even after long-term storage, the rate of change in friction is small. In addition, the wet friction properties of the polyester staple fiber are improved. EXAMPLES

[0100] In the following, examples will be given in order to more specifically describe the configuration and effects of the present invention, but the present invention is not limited to these examples. In the following examples and comparative examples, parts means parts by mass.

[0101] Test Category 1 (Preparation of fiber treatment agents for spun yarn production) Example 1 As shown in Table 1, 52.18 parts (mass%) of the phosphoric acid compound (A-4) shown in Table 2 as the phosphoric acid compound (A), 1.34 parts (mass%) of stearyl alcohol (B-1) as the alcohol (B), and 1.29 parts (mass%) of lauryl alcohol (B-3) as the alcohol (B), 0.39 parts (mass%) of stearic acid (C-2) as the fatty acid (C), and 44.8 parts (mass%) of the nonionic surfactant (D-1) shown in Table 3 as the nonionic surfactant (D) were diluted in a beaker with 900 parts of hot water at 70 ° C. The mixture was stirred until uniform, and a 10% by mass aqueous solution of the fiber treatment agent for spun yarn production of Example 1 was prepared.

[0102] (Examples 2 to 2 2 , Comparative Examples 1 to 7) Example 2 to Example 2 2 The treatment agents of Comparative Examples 1 to 7 were prepared in the same manner as the treatment agent of Example 1, so as to contain the phosphoric acid compound (A), alcohol (B), fatty acid (C), nonionic surfactant (D), and other components (E) in the proportions shown in Table 1.

[0103] The type and content of the phosphoric acid compound (A), the type and content of the alcohol (B), the type and content of the fatty acid (C), the type and content of the nonionic surfactant (D), and the type and content of the other component (E) are shown in the "Phosphate compound (A)", "Alcohol (B)", "Fatty acid (C)", "Nonionic surfactant (D)", and "Other (E)" columns of Table 1. In addition, the value calculated by formula (1) and the acid value per nonvolatile content of the treatment agent are shown in the "Value of formula 1" and "Acid value of treatment agent" columns of Table 1.

[0104] [Table 1]

[0105] Details of the phosphoric acid compound (A) shown in Table 1 are as follows. <Phosphate compound (A)> The phosphate compounds (A) used were A-1 to A-16 listed in Table 2. The type of phosphate compound (A) is shown in the "Type of phosphate compound (A)" column of Table 2. The production conditions, acid value, and P nucleus NMR integral ratio of phosphate compound (A) are shown in the "Production conditions (A / B / C / D)" column, "Acid value of phosphate compound (A)" column, and "P nucleus NMR integral ratio (%)" column of Table 2, respectively.

[0106] [Table 2]

[0107] Table 3 shows details of the production conditions A to D for the phosphoric acid compound (A) shown in Table 2. In Table 3, the "alcohol dehydration" column indicates whether or not the raw material alcohol was dehydrated. The "synthetic environment" column indicates the atmosphere of the phosphorylation reaction. The "phosphorylation conditions" column indicates the temperature and time of the phosphorylation reaction. The "water added after phosphorylation" column indicates whether or not water was added after the phosphorylation reaction. The "neutralization conditions" column indicates the temperature and time of neutralization of the phosphoric acid.

[0108] [Table 3]

[0109] The production conditions A to D of the phosphoric acid compound (A) are described in further detail below. (Manufacturing condition A) In manufacturing condition A, the raw material alcohol used was one that had been dehydrated under reduced pressure at 105°C. The raw material alcohol was charged into a four-neck flask, and diphosphorus pentoxide was gradually added to it under a nitrogen atmosphere, and the phosphorylation reaction was carried out by stirring at 80±3°C for 3 hours. The phosphoric acid obtained in the phosphorylation reaction was gradually added to an aqueous potassium hydroxide solution, and the phosphoric acid was neutralized by stirring at 90±3°C for 6 hours, synthesizing a phosphoric acid ester compound.

[0110] (Manufacturing condition B) In manufacturing condition B, the raw material alcohol was used as it was after opening the reagent bottle. The phosphorylation reaction was carried out in the atmosphere. After opening the reagent bottle, diphosphorus pentoxide was left in the atmosphere (room temperature: approximately 27°C, relative humidity: approximately 80%) until the entire amount was added. It took approximately 30 minutes from the start to the end of adding diphosphorus pentoxide. The phosphate ester compound was synthesized under other conditions similar to those of manufacturing condition A.

[0111] (Manufacturing condition C) In manufacturing condition C, the raw material alcohol was used as it was after opening the reagent bottle. The phosphorylation reaction was carried out in the atmosphere. After opening the reagent bottle, diphosphorus pentoxide was placed in the atmosphere (room temperature: approximately 27°C, relative humidity: approximately 80%) until the entire amount was added. It took approximately 30 minutes from the start of adding diphosphorus pentoxide to its completion. The phosphorylation reaction was carried out by stirring at 80±3°C for 3 hours. The phosphoric acid obtained in the phosphorylation reaction was gradually added to an aqueous potassium hydroxide solution, and the phosphoric acid was neutralized by stirring at 80±3°C for 3 hours. The phosphate ester compound was synthesized under other conditions similar to those of manufacturing condition A.

[0112] (Manufacturing condition D) In manufacturing condition D, the raw material alcohol was used as it was after the reagent bottle was opened. The phosphorylation reaction was carried out under the atmosphere. After the reagent bottle was opened, diphosphorus pentoxide was placed under the atmosphere (room temperature: about 27°C, relative humidity: about 80%) until the entire amount was added. It took about 30 minutes from the start of adding diphosphorus pentoxide to the end of adding it. The phosphorylation reaction was carried out by stirring at 80±3°C for 3 hours. After the phosphorylation reaction was completed, water was added in an amount of 1.5% by mass of the total amount of the raw material alcohol and diphosphorus pentoxide, and the mixture was stirred at 80±3°C for 1 hour to obtain a phosphoric acid oxide. The obtained phosphoric acid oxide was gradually added to an aqueous potassium hydroxide solution, and the phosphoric acid oxide was neutralized by stirring at 80±3°C for 3 hours. A phosphoric acid ester compound was synthesized under the same conditions as manufacturing condition A.

[0113] In addition, in each of the production conditions A to D, the compounding ratio of the raw material alcohol and diphosphorus pentoxide, the conditions for neutralizing the phosphoric acid oxide, etc. may be appropriately adjusted within the scope of common general technical knowledge. By adjusting these conditions, the composition of the phosphate ester compound synthesized can be adjusted even under the same production conditions. That is, the ratio of the phosphate esters P1 to P5 and orthophosphoric acid contained in the phosphoric acid compound (A) can be adjusted.

[0114] The P NMR integral ratio of the phosphate compound (A) shown in Table 2 was measured by the following method. (Method for measuring P NMR integral ratio) The P NMR integral ratio of the phosphoric acid compound (A) was pretreated by first adding an excess of KOH to the phosphoric acid compound (A) to adjust the pH to 12 or higher. This pretreatment allows the peaks attributable to phosphate ester P1, phosphate ester P2, phosphate ester P3, phosphate ester P4, phosphate ester P5, orthophosphoric acid, and its salts to be clearly separated in the 31P-NMR measurement.

[0115] The P nucleus NMR integral ratio was measured using 31P-NMR (Mercury Plus NMR Spectrometer System, 300 MHz, manufactured by Valian Corporation, the same applies below).

[0116] The solvent used was a mixed solvent of heavy water / tetrahydrofuran=8 / 2 (volume ratio). Among the obtained signals, the integral value of the single signal appearing between -3 ppm and -7 ppm corresponds to the P atom in P1.

[0117] The sum of the integrals of the doublet signals appearing between -3 and -7 ppm and -7 and -11 ppm corresponds to the P atoms in P2. The integral of the single signal appearing between -7 ppm and -14 ppm corresponds to the P atom in P3.

[0118] The integral value of the single signal appearing between 3 ppm and 7 ppm corresponds to the P atom in P4. The integral value of the single signal appearing between -1 ppm and 4 ppm corresponds to the P atom in P5.

[0119] The integral value of the signal appearing between 4 ppm and 10 ppm corresponds to the P atoms in orthophosphoric acid and its salts. However, if signals are detected in overlapping ranges of the above values, signals derived from P atoms corresponding to orthophosphoric acid and its salts, phosphate esters P4, P5, P2 (-3 ppm to -7 ppm), P1, P2 (-7 ppm to -11 ppm), and P3 will be detected, in order from the low magnetic field side.

[0120] The total of the P nucleus NMR integral ratios assigned to phosphate P1, phosphate P2, phosphate P3, phosphate P4, phosphate P5, orthophosphoric acid and salts thereof is taken as 100%, and the value can be calculated by the above-mentioned formula (1).

[0121] The acid value of the phosphoric acid compound (A) shown in Table 2 was measured by the following method. (Method of measuring acid value) The phosphoric acid compound (A) was dissolved in a mixed solvent of ethanol / xylene = 1 / 2 (volume ratio), set in a potentiometric titrator, and titrated with a 0.1 mol / L standard solution of potassium hydroxide in methanol. The acid value was calculated using the same formula as that used to measure the acid value of the treatment agent described above.

[0122] Details of the alcohol (B) shown in Table 1 are as follows. <Alcohol (B)> B-1: Stearyl alcohol B-2: Cetyl alcohol B-3: Lauryl alcohol B-4: A mixed alcohol of linear and branched chains with carbon numbers 12 and 13 Details of the fatty acids (C) shown in Table 1 are as follows.

[0123] <Fatty acid (C)> C-1: Lauric acid C-2: Stearic acid Details of the nonionic surfactant (D) shown in Table 1 are as follows.

[0124] <Nonionic surfactant (D)> As the nonionic surfactant (D), D-1 to D-6 shown in Table 4 were used.

[0125] [Table 4]

[0126] In Table 4, D-1 to D-6 are compositions prepared by mixing one or more selected from the multiple types of nonionic surfactants (D) represented by components 1 to 9. Details of components 1 to 9 are as follows.

[0127] Component 1: A compound in which 15 moles of ethylene oxide (hereinafter also referred to as EO) are added to 1 mole of lauryl alcohol. Component 2: A compound in which 6 moles of propylene oxide (hereinafter also referred to as PO) and 2 moles of EO are randomly added to 1 mole of a mixed alcohol of linear / branched chains with 12 and 13 carbon atoms. Component 3: A compound in which 4 moles of PO are added to 1 mole of a mixed alcohol of straight chain / branched alcohol with carbon numbers of 12 and 13, and then 4 moles of EO are added in blocks. Component 4: A compound in which 10 moles of EO are added to 1 mole of a mixed alcohol of linear / branched alcohols with carbon numbers of 12 and 13. Component 5: A compound in which 2 moles of PO and 4 moles of EO are randomly added to 1 mole of nonylphenol, and then 2 moles of EO are added. Component 6: A compound in which 10 moles of EO are added to 1 mole of nonylphenol Component 7: A compound in which 15 moles of EO are added to 1 mole of laurylamine Component 8: A compound in which 10 moles of EO are added to 1 mole of lauric acid Component 9: A compound in which 10 moles of EO are added to 1 mole of laurylamine Details of the other components (E) shown in Table 1 are as follows.

[0128] <Other ingredients (E)> E-1: Polydimethylsiloxane E-2: Amino-modified polydimethylsiloxane Test category 2 (adhesion of fiber treatment agents used in spun yarn production to polyester staple fibers) Fineness 1.3×10 -4 A semi-dull polyester composite fiber (polyester staple fiber) with a fiber length of 38 mm and a density of 1.2 g / m (denier) was prepared. A 10% by mass aqueous solution of each treatment agent prepared in Test Section 1 was further diluted with water to obtain a 0.30% by mass aqueous solution, and this was applied to 100 g of this fiber by a spray method so that the amount of the treatment agent applied was 0.15% as non-volatile matter. After drying for 2 hours in a hot air dryer at 80°C, the fiber was conditioned overnight in an atmosphere at 20°C and 65% RH to obtain a treatment agent-applied polyester composite fiber (hereinafter also referred to as treatment agent-applied fiber).

[0129] Test category 3 (card passability) The fibers with the treatment agent attached were conditioned for 24 hours in a thermostatic chamber at 20°C and 65% RH. After conditioning, 30 g of the fibers with the treatment agent attached were passed through a miniature carding machine (manufactured by Takeuchi Seisakusho Co., Ltd.) to produce a fiber web. Evaluation was based on the amount of spinning 20 seconds after all the raw cotton had entered the carding machine and evaluated according to the following criteria. The results are shown in the "Carding passability" column in Table 1.

[0130] ·Card passability evaluation criteria 4 (Excellent): Card passing rate is 95% or more 3 (Good): Card passing rate is between 90% and 95% 2 (OK): Card passing volume is between 80% and 90% 1 (Not acceptable): Card swiping rate is less than 80% Test category 4 (high temperature and humidity treatment) The fiber with the treatment agent attached was aged for 48 hours in a thermostatic chamber at 70°C x 90% RH to obtain a polyester composite fiber with the treatment agent attached and treated at high temperature and high humidity (hereinafter, also referred to as high temperature and high humidity treated fiber) simulating long-term storage. In the present invention, long-term storage means storage for 48 hours or more.

[0131] Test category 5 (friction change rate after long-term storage) 20g of fiber that had been subjected to high temperature and humidity treatment and 20g of fiber with treatment agent attached that had not been subjected to high temperature and humidity treatment were each conditioned for 24 hours in a thermostatic chamber at 20℃ × 65% RH, and then fed into a miniature carding machine to produce a carded web. The produced carded web was fed into a miniature drawing machine to obtain a sliver with a grain of 3g / m. For the slivers under the above two conditions, the draft force was measured when the sliver was drafted at a sliver speed of 1m / min and a draft ratio of 1.5 times, and the friction change rate with and without high temperature and humidity treatment was calculated using the following formula and evaluated according to the following evaluation criteria. The results are shown in the "Friction Change Rate" column in Table 1.

[0132] [Friction change rate] = [Draft force of fiber with treatment agent attached that has not been treated with high temperature and humidity] / [Draft force of fiber with high temperature and humidity treatment] x 100 Evaluation criteria for friction change rate 3 (Good): Friction change rate is less than 5% 2 (Acceptable): When the friction change rate is 5% or more and less than 10% 1 (Not acceptable): When the friction change rate is 10% or more Test category 6 (emulsion stability) Hard water with a hardness of 300 was prepared by dissolving 300 mg of calcium carbonate in 1 L of distilled water. Using the hardness of 300, an aqueous solution of hard water with a concentration of the treatment agent of each example of 10% by mass was prepared. The aqueous solution was further diluted with hard water to prepare an aqueous solution with a non-volatile content concentration of 0.3% by mass. The aqueous solution was kept at a constant temperature of 20°C for 24 hours, after which the state of the aqueous solution was visually observed and evaluated according to the following evaluation criteria. The results are shown in the "emulsion stability" column of Table 1.

[0133] ·Evaluation criteria for emulsion stability 3 (Good): No precipitate or particles 2 (Acceptable): No precipitate but particles present 1 (Not acceptable): If there is sediment Test category 7 (wet friction characteristics) The 10% by mass aqueous solution of the treatment agent prepared in Test Section 1 was diluted with ion-exchanged water to prepare a 0.35% by mass aqueous solution. 80 mL of the prepared 0.35% by mass aqueous solution was placed in a metal tray measuring 60 mm in length, 230 mm in width, and 20 mm in height.

[0134] A rectangular plate-shaped weight measuring 30 mm in length, 90 mm in width, and 45 mm in height, and weighing 1 kg, was prepared. A polyester spunbond nonwoven fabric of the same size as the bottom of the weight was attached to the bottom surface of the weight using double-sided tape. The weight was placed in the pad containing the 0.35% by mass aqueous liquid, with the bottom surface with the polyester spunbond nonwoven fabric attached facing down.

[0135] A tensile test was performed using a tensile testing machine (Shimadzu Corporation, Autograph Model AGS-X) equipped with a load cell with a maximum load capacity of 50 N, in an atmosphere of 20°C x 60% RH, at a horizontal speed of 100 mm / min.

[0136] The frictional properties between the fiber and metal when wet were evaluated by the above method. Specifically, the frictional properties between the fiber and metal rollers in the spinning process and drawing process were evaluated by the above method. The evaluation of the frictional properties was carried out within 12 hours after the preparation of the 0.35 mass% aqueous solution. When the treatment agent of Comparative Example 1 was used, the friction between the fiber and metal when wet became relatively large, so the evaluation was carried out based on Comparative Example 1 and on the following evaluation criteria. The results are shown in the "Wet Friction" column of Table 1.

[0137] Evaluation criteria for wet friction properties 3 (Good): The M / N ratio, which is the ratio of the friction N measured using the 0.35% by mass aqueous solution of Comparative Example 1 to the friction M measured using the 0.35% by mass aqueous solution of each example, is 0.98 or less. 2 (Acceptable): The above M / N ratio is greater than 0.98 and less than or equal to 0.99. 1 (Not acceptable): If the M / N ratio is greater than 0.99 Test category 8 (anti-foaming) The 10% by mass aqueous solution of the treatment agent prepared in Test Category 1 was diluted with ion-exchanged water to prepare a 0.25% by mass aqueous solution. 25g of the prepared aqueous solution was placed in a 100mL measuring cylinder with a stopper and vigorously shaken 30 times over 30 seconds, allowed to stand for 30 seconds, and then vigorously shaken again 30 times over 30 seconds. After allowing to stand for 5 minutes, the height H1 from the water surface to the top of the foam was measured. Evaluation was based on the following evaluation criteria. The results are shown in the "Foam suppression" column in Table 1.

[0138] ·Evaluation criteria for foam suppression 4 (Excellent): H1≦8.0cm 3(Good):8.0cm 2 (possible): 10.0cm 1 (not allowed): 13.0cm Test category 9 (acid value of treatment agent) The acid value of the treatment agent was measured by JIS K 0070-1992 "3.2 Potentiometric titration method". The solvent used was a mixed solvent of ethanol / xylene. The results are shown in the "Acid value of treatment agent" column in Table 1.

[0139] ​​​As shown in Table 1, the treatment agent of Comparative Example 1 did not contain alcohol (B) and had an acid value outside the lower limit of the numerical range of the present invention, confirming that it had poor foam-suppressing properties. The treatment agent of Comparative Example 2 did not contain the alcohol (B) and the phosphoric acid compound (A) did not contain the phosphoric acid ester P3, and it was confirmed that the treatment agent had poor foam-inhibiting properties and emulsion stability.

[0140] It was confirmed that the treatment agent of Comparative Example 3 had an acid value outside the lower limit of the numerical range of the present invention, and had inferior wet friction characteristics. It was confirmed that the treatment agent of Comparative Example 4 had an acid value outside the upper limit of the numerical range of the present invention, and thus had poor emulsion stability.

[0141] It was confirmed that the treating agent of Comparative Example 5 had a value calculated by the formula (1) outside the range of the present invention, and was inferior in the rate of change in friction. It was confirmed that the treatment agent of Comparative Example 6 had poor emulsion stability because the phosphoric acid compound (A) did not contain the phosphoric acid ester P3.

[0142] The treatment agent of Comparative Example 7 did not contain the alcohol (B) and was confirmed to have poor foam-suppressing properties. On the other hand, the treatment agent of the present invention can improve the friction change rate after long-term storage, emulsion stability, wet friction characteristics, and foam suppression properties. It can also improve card passability.

Claims

1. A fiber treatment agent for spun yarn production, comprising the following phosphoric acid compound (A) and the following alcohol (B), In a P-nuclear NMR measurement of the fiber treatment agent for spun yarn production after alkali overneutralization pretreatment, when the total of the P-nuclear NMR integral ratios attributable to phosphate P1, phosphate P2, phosphate P3, phosphate P4, phosphate P5, orthophosphoric acid and salts thereof is taken as 100%, the P-nuclear NMR integral ratio attributable to phosphate P4 is 20% or more and 70% or less, the P-nuclear NMR integral ratio attributable to phosphate P5 is 20% or more and 50% or less, and the value calculated by the following mathematical formula (1) is 8 or less, The fiber treating agent for use in the production of spun yarn is characterized in that the acid value per non-volatile content of the fiber treating agent for use in the production of spun yarn is 2.5 KOH-mg / g or more and less than 50 KOH-mg / g. Phosphate compound (A): containing a phosphate ester P3 represented by the following formula (3), a phosphate ester P4 represented by the following formula (4), a phosphate ester P5 represented by the following formula (5), and orthophosphoric acid, and optionally further containing at least one selected from a phosphate ester P1 represented by the following formula (1) and a phosphate ester P2 represented by the following formula (2). 【number】 (In Chemical Formula 1, M １ , M ２ , M ３ : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. 【number】 (In Chemical Formula 2, R １ : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M ４ , M ５ : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. 【number】 (In Chemical Formula 3, R ２ , R ３ : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M ６ : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. 【number】 (In Chemical Formula 4, R ４ : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M ７ , M ８ : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. 【number】 (In Chemical Formula 5, R ５ , R ６ : an alkyl or alkenyl group having 16 or more and 20 or less carbon atoms. M ９ : Hydrogen atom, alkali metal, alkaline earth metal (1 / 2), organic amine, ammonium, or phosphonium. [0010] Alcohol (B): an aliphatic alcohol having 8 to 18 carbon atoms.

2. The fiber treating agent for producing spun yarn according to claim 1, wherein the value obtained by the formula (1) is 3.5 or less.

3. The fiber treatment agent for producing spun yarn according to claim 1, wherein the P NMR integral ratio attributable to the phosphate ester P3 is 6.5% or more and 40% or less.

4. The fiber treatment agent for producing spun yarn according to claim 1, wherein the sum of the P nuclear NMR integral ratios attributable to the phosphate ester P2 and the phosphate ester P3 is more than 0% and less than 25%.

5. 2. The fiber treatment agent for producing spun yarn according to claim 1, wherein the content of the phosphoric acid compound (A) is 85% by mass or more and 99.5% by mass or less, and the content of the alcohol (B) is 0.5% by mass or more and 15% by mass or less, assuming that the content of the phosphoric acid compound (A) and the content of the alcohol (B) are 100% by mass.

6. The fiber treating agent for spun yarn production according to claim 1, which satisfies at least one of the following two conditions: Condition 1: The alcohol (B) contains two or more kinds of alcohols having different carbon numbers. Condition 2: Contains a fatty acid (C) having 12 to 20 carbon atoms.

7. 2. The fiber treatment agent for producing spun yarn according to claim 1, further comprising the following nonionic surfactant (D): Nonionic surfactant (D): At least one selected from polyoxyethylene alkyl ethers, polyoxyethylene alkenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkenyl esters, polyoxyethylene alkyl phenyl ethers, polyoxyalkylene alkyl amines, polyoxyalkylene alkenyl amines, salts of polyoxyalkylene alkyl amines and inorganic acids, and salts of polyoxyalkylene alkenyl amines and inorganic acids.

8. 8. The fiber treatment agent for producing spun yarn according to claim 7, wherein the content of the phosphoric acid compound (A), the alcohol (B), and the nonionic surfactant (D) is 100% by mass, and the fiber treatment agent contains the phosphoric acid compound (A) in an amount of 25% by mass or more and 80% by mass or less, the alcohol (B) in an amount of 0.5% by mass or more and 10% by mass or less, and the nonionic surfactant (D) in an amount of 15% by mass or more and 74.5% by mass or less.

9. 9. An aqueous solution of a fiber treatment agent for producing spun yarn, comprising the fiber treatment agent for producing spun yarn according to claim 1, having a non-volatile content of 0.1% by mass or more and 10% by mass or less.

10. A fiber having the fiber treating agent for producing spun yarn according to any one of claims 1 to 8 adhered thereto.

11. The fiber of claim 10, wherein the fiber is a polyester staple fiber.

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