Treatment agent for polyester synthetic fibers, first treatment agent for polyester synthetic fibers, second treatment agent for polyester synthetic fibers, and polyester synthetic fibers

Abstract

The present invention provides a treatment agent for polyester synthetic fibers, a first treatment agent for polyester synthetic fibers, a second treatment agent for polyester synthetic fibers, and polyester synthetic fibers, which can improve the antistatic properties and carding properties of fibers treated with a synthetic fiber treatment agent. [Solution] The present invention provides a treatment agent for polyester synthetic fibers, characterized by containing the following alkyl phosphate ester (A), nonionic surfactant (B), and nitrogen-containing polyvalent potassium carboxylate salt (C). Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof.

Description

Technical Field

[0001] The present invention relates to a treatment agent for polyester synthetic fibers, a first treatment agent for polyester synthetic fibers, a second treatment agent for polyester synthetic fibers, and polyester synthetic fibers to which the treatment agent for polyester synthetic fibers is applied.

Background Art

[0002] Generally, in the spinning process, drawing process, finishing process, etc. of synthetic fibers, a treatment for attaching a treatment agent for synthetic fibers to the surface of the synthetic fibers may be performed from the viewpoint of reducing friction and the like and improving antistatic properties and the like.

[0003] For example, conventionally, treatment agents for synthetic fibers disclosed in Patent Documents 1 to 3 are known. Patent Document 1 discloses a treatment agent for polyester synthetic fibers containing (poly)oxyalkylene derivatives (A), organic acid compounds (B), and organic phosphate ester compounds (C).

[0004] Patent Document 2 discloses a treatment agent for synthetic fibers mainly composed of an anionic surfactant, wherein the treatment agent contains a chelating agent in a proportion of 1 to 20% by weight based on the active ingredient of the treatment agent.

[0005] Patent Document 3 discloses a treatment agent for polyester synthetic fibers containing 40 to 80% by mass of an alkali metal salt of an alkyl phosphate ester having an alkyl group with 12 to 22 carbon atoms in the molecule, 20 to 59.99% by mass of a predetermined surfactant, and 0.01 to 3.0% by mass of a predetermined metal phosphate (total 100% by mass), and the acid value of the alkali metal salt of the alkyl phosphate ester is 0.1 to 90 KOHmg / g.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] However, conventional synthetic fiber treatment agents had the problem that the treated fibers had poor antistatic properties and carding properties. [Means for solving the problem]

[0008] As a result of research conducted to solve the above-mentioned problems, the inventors of the present invention have found that the composition of a synthetic fiber treatment agent containing the following alkyl phosphate ester (A), nonionic surfactant (B), and nitrogen-containing polycarboxylic acid potassium salt (C) is indeed suitable.

[0009] The following describes various methods for solving the above problems. The treatment agent for polyester synthetic fibers according to Embodiment 1 is the following alkyl phosphate ester (A) 15% by mass or more and 85% by mass or less Nonionic surfactant (B) 5% by mass or more and 80% by mass or less , and The following Nitrogen-containing polycarboxylic acid potassium salt (C) 0.1% by mass or more and 15% by mass or less, It is characterized by containing [the following].

[0010] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Nitrogen-containing polycarboxylic acid potassium salt (C): A compound in which the nitrogen-containing polycarboxylic acid constituting the nitrogen-containing polycarboxylic acid potassium salt is at least one selected from the following general formulas (1) to (4): hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, and glycol etherdiaminetetraacetic acid.

[0011] [ka] R 1 ,R 2 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0012] [Chemistry] R 3 ,R 4 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0013] [Chemistry] R 5 ,R 7 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0014] R 6 ,R 8 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. m: 1 or 2.

[0015] (R 6 If there are two, then each R 6 (They may be the same or different.)

[0016] [Chemistry] R 9 ,R 10 ,R 13 ,R 14 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0017] R 11 ,R 12 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. n: 1 or 2.

[0018] (R 11 If there are two, then each R 11 (They may be the same or different.) Aspect 2 is the aspect 1In the treatment agent for polyester synthetic fibers described above, the mass ratio of the alkyl phosphate ester (A) and the nonionic surfactant (B) is alkyl phosphate ester (A) / nonionic surfactant (B) = 20 / 80 to 80 / 20.

[0019] manner 3 This is aspect 1 or 2 In the treatment agent for polyester synthetic fibers described above, the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% to 75% by mass, the nonionic surfactant (B) in an amount of 20% to 75% by mass, and the nitrogen-containing polyvalent potassium carboxylate salt (C) in an amount of 0.2% to 5.0% by mass.

[0020] manner 4 This is in aspect 1~ 3 In the treatment agent for polyester synthetic fibers according to any one embodiment, the alkyl group constituting the alkyl phosphate ester (A) has 16 or more carbon atoms and 18 or fewer carbon atoms.

[0021] manner 5 This is in aspect 1~ 4 A treatment agent for polyester synthetic fibers according to any one embodiment further contains the following inorganic phosphoric acid (D). Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

[0022] manner 6 is, 5 In the treatment agent for polyester synthetic fibers described above, the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% to 74.99% by mass, the nonionic surfactant (B) in an amount of 20% to 74.99% by mass, the nitrogen-containing polyvalent carboxylate potassium salt (C) in an amount of 0.2% to 5.0% by mass, and the inorganic phosphate (D) in an amount of more than 0% to 5.0% by mass.

[0023] manner 7The first treatment agent for polyester synthetic fibers is a first treatment agent for polyester synthetic fibers used in combination with a second treatment agent for polyester synthetic fibers containing a nonionic surfactant (B), wherein at least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers is The following It contains a nitrogen-containing polycarboxylic acid potassium salt (C), the alkyl phosphate ester (A) listed below, and optionally the inorganic phosphate (D) listed below. Furthermore, in a mixture obtained by mixing the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers, the alkyl phosphate ester (A) is contained in an amount of 15% to 85% by mass, the nonionic surfactant (B) in an amount of 5% to 80% by mass, and the nitrogen-containing polyvalent potassium carboxylate (C) in an amount of 0.1% to 15% by mass. It is characterized by doing so.

[0024] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Nitrogen-containing polycarboxylic acid potassium salt (C): A compound in which the nitrogen-containing polycarboxylic acid constituting the nitrogen-containing polycarboxylic acid potassium salt is at least one selected from the following general formulas (1) to (4): hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, and glycol etherdiaminetetraacetic acid.

[0025] [ka] R 1 ,R 2 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0026] [ka] R 3 ,R 4 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0027] [ka] R 5 ,R 7 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0028] R 6 ,R 8 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. m: 1 or 2.

[0029] (R 6 If there are two, then each R 6 (They may be the same or different.)

[0030] [ka] R 9 ,R 10 ,R 13 ,R 14 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0031] R 11 ,R 12 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. n: 1 or 2.

[0032] (R 11 If there are two, then each R 11 (They may be the same or different.) Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts. manner 8 The second treatment agent for polyester synthetic fibers is a second treatment agent for polyester synthetic fibers used in combination with a first treatment agent for polyester synthetic fibers containing the following alkyl phosphate ester (A) and optionally the following inorganic phosphate (D), wherein at least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers is The following It contains a nitrogen-containing polyvalent potassium carboxylate (C) and a nonionic surfactant (B). Furthermore, in a mixture obtained by mixing the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers, the alkyl phosphate ester (A) is contained in an amount of 15% to 85% by mass, the nonionic surfactant (B) in an amount of 5% to 80% by mass, and the nitrogen-containing polyvalent potassium carboxylate (C) in an amount of 0.1% to 15% by mass. It is characterized by doing so.

[0033] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Nitrogen-containing polycarboxylic acid potassium salt (C): A compound in which the nitrogen-containing polycarboxylic acid constituting the nitrogen-containing polycarboxylic acid potassium salt is at least one selected from the following general formulas (1) to (4): hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, and glycol etherdiaminetetraacetic acid.

[0034]

change

[0035]

change

[0036]

change

[0037] R 6 ,R 8 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. m: 1 or 2.

[0038] (R 6 If there are two, then each R 6 (They may be the same or different.)

[0039]

change

[0040] R 11 ,R 12 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. n: 1 or 2.

[0041] (R 11 If there are two, then each R 11 (They may be the same or different.) Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts. manner 9 The polyester synthetic fiber is as follows: Embodiments 1~ 6 The material is characterized by having a treatment agent for polyester synthetic fibers described in any one embodiment attached to it. [Effects of the Invention]

[0042] According to the present invention, the antistatic properties and carding properties can be improved for fibers treated with a polyester synthetic fiber treatment agent. [Modes for carrying out the invention]

[0043] <First Embodiment> The following describes a first embodiment of the treatment agent for polyester synthetic fibers of the present invention (hereinafter also simply referred to as the treatment agent). The treatment agent of this embodiment contains the following alkyl phosphate ester (A), nonionic surfactant (B), and nitrogen-containing polycarboxylic acid potassium salt (C). The treatment agent may further contain a predetermined inorganic phosphoric acid (D).

[0044] (Alkyl phosphate ester (A)) Alkyl phosphate ester (A) is at least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. It may also be a linear alkyl group or a branched alkyl group.

[0045] As mentioned above, the number of carbon atoms in the alkyl group is between 16 and 22. Specific examples of alkyl groups include, for example, hexadecyl group, heptadecyl group, octadecyl group, icosyl group, docosyl group, isohexadecyl group, isoheptadecyl group, isooctadyl group, isoicosyl group, and isodocosyl group. Among these, compounds having an alkyl group with 16 to 18 carbon atoms are preferred. By using such compounds, the smoothness of fibers treated with the treatment agent can be further improved.

[0046] The phosphoric acid constituting the alkyl phosphate ester is not particularly limited and may be orthophosphate or polyphosphate such as diphosphate. Specific examples of alkali metals that make up alkali metal salts include sodium, potassium, and lithium.

[0047] The acid value of alkyl phosphate ester (A) is not particularly limited, but is preferably 0.1 mg KOH / g or more and 80 mg KOH / g or less, and more preferably 5 mg KOH / g or more and 60 mg KOH / g or less.

[0048] The acid value (KOH mg / g) of the treatment agent is expressed by the following formula. A sample solution was prepared by dissolving alkyl phosphate ester (A) in deionized water. The prepared sample solution was set in a known potentiometric analyzer and titrated with a 0.1 mol / L potassium hydroxide methanol standard solution. The acid value of the treatment agent was calculated using the following formula.

[0049] Acid value (KOH-mg / g)=(R×f×56.11×0.1) / S In mathematical formulas, f: Factor of 0.1 mol / L potassium hydroxide methanol standard solution S: Sample volume (g, calculated as non-volatile content) R: Amount of 0.1 mol / L potassium hydroxide methanol standard solution used up to the inflection point (mL) The non-volatile content is determined from the mass of the oven-dried material obtained by heat-treating the object at 105°C for 2 hours to thoroughly remove volatile substances (the same applies hereafter).

[0050] Specific examples of alkyl phosphate esters (A) include, for example, stearyl phosphate potassium salt, cetyl phosphate potassium salt, eicosyl phosphate potassium salt, and behenyl phosphate potassium salt.

[0051] These alkyl phosphate esters (A) may be used individually or in combination of two or more as appropriate. The lower limit of the content of alkyl phosphate ester (A) in the treatment agent is set as appropriate, but is preferably 15% by mass or more, more preferably 20% by mass or more. When the content is 15% by mass or more, the carding properties of the treated fibers can be particularly improved. The upper limit of the content of alkyl phosphate ester (A) is set as appropriate, but is preferably 85% by mass or less, more preferably 75% by mass or less. When the content is 85% by mass or less, the carding properties of the treated fibers can be particularly improved. A range of arbitrary combinations of the above upper and lower limits is also conceivable. In the present invention, the content of alkyl phosphate ester (A) in the treatment agent is set to 15% by mass or more and 85% by mass or less.

[0052] (Nonionic surfactant (B)) Examples of nonionic surfactants (B) include compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to alcohols or carboxylic acids, ether ester compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to ester compounds of carboxylic acids and polyhydric alcohols, amine compounds such as compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to primary organic amines, partial ester compounds of carboxylic acids and polyhydric alcohols, amide compounds obtained by condensing amine compounds and carboxylic acids, compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to fatty acid amides, and compounds having a polyoxyalkylene structure such as block copolymers having polyoxyethylene chains, polyoxyethylene chains and polyoxypropylene chains.

[0053] Specific examples of alcohols used as raw materials for nonionic surfactants (B) include, for example, (1) linear alkyl alcohols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptadecanol, octacosanol, nonacosanol, triacontanol, (2) isopropanol, isobutanol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isododecanol, isotridecanol, isotetradecanol, isopentadecanol, isohex Examples include branched alkyl alcohols such as (3) tetradecenol, hexadecenol, heptadecenol, isononadecenol, isoeicosanol, isoheneicosanol, isodocosanol, isotricosanol, isotetracosanol, isopentacosanol, isohexacosanol, isoheptacosanol, isooctacosanol, isononacosanol, and isotriacontanol; (4) linear alkenyl alcohols such as tetradecenol, hexadecenol, heptadecenol, octadecenol, and nonadecenol; (5) branched alkenyl alcohols such as isohexadecenol and isooctadecenol; (6) cyclic alkyl alcohols such as cyclopentanol and cyclohexanol; and aromatic alcohols such as phenol, nonylphenol, benzyl alcohol, monostylenide, distylenide, and tristylenide.

[0054] Specific examples of carboxylic acids used as raw materials for nonionic surfactants (B) include, for example, (1) linear alkyl carboxylic acids such as octic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, eicosanoic acid, heneicosanoic acid, and docosanoic acid; (2) branched alkyl carboxylic acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, and isooctadecanoic acid; (3) linear alkenyl carboxylic acids such as octadecenoic acid, octadecadienoic acid, and octadecatrienoic acid; (4) aromatic carboxylic acids such as benzoic acid; (5) hydroxycarboxylic acids such as lactic acid, citric acid, and ricinoleic acid; and (6) polycarboxylic acids such as adipic acid, sebacic acid, and tricarbaryl.

[0055] As the alkylene oxide used as a raw material to form the (poly)oxyalkylene structure of the nonionic surfactant (B), alkylene oxides having 2 to 4 carbon atoms are preferred. Specific examples of alkylene oxides include ethylene oxide, propylene oxide, and butylene oxide. The number of moles of alkylene oxide to be added is set as appropriate, but is preferably 0.1 moles to 60 moles, more preferably 1 mole to 40 moles, and even more preferably 2 moles to 30 moles. Ranges arbitrarily combining the above upper and lower limits are also conceivable. The number of moles of alkylene oxide to be added indicates the number of moles of alkylene oxide per mole of the compound to be added in the raw materials. One type of alkylene oxide may be used alone, or two or more types of alkylene oxides may be used in appropriate combinations. When two or more types of alkylene oxide are applied, their addition methods may be block addition, random addition, or a combination of block addition and random addition, and are not particularly limited.

[0056] Specific examples of polyhydric alcohols used as raw materials for nonionic surfactants (B) include, for example, ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 2-methyl-2,4-pentanediol, 2,3-dimethyl-2,3-butanediol, glycerin, 2-methyl-2-hydroxymethyl-1,3-propanediol, trimethylolpropane, sorbitan, pentaerythritol, sorbitol, and the like.

[0057] Specific examples of aliphatic amines used as raw materials for nonionic surfactants (B) include methylamine, ethylamine, butylamine, octylamine, laurylamine, octadecylamine, octadecenylamine, and coconutamine.

[0058] Specific examples of fatty acid amides used as raw materials for nonionic surfactants (B) include, for example, octylic acid amide, lauric acid amide, palmitic acid amide, stearic acid amide, oleic acid amide, behenic acid amide, lignoceric acid amide, amide of fatty acid and diethanolamine, and amide of fatty acid and ethyleneamine.

[0059] Compounds having a polyoxyalkylene structure are not particularly limited as long as they have surfactant properties. The number of polyoxyethylene chains and / or polyoxypropylene chains in the molecule is not particularly limited. The number of moles of ethylene oxide added to form the polyoxyethylene chain is not particularly limited, for example, 3 moles to 200 moles. The number of moles of propylene oxide added to form the polyoxypropylene chain is not particularly limited, for example, 3 moles to 100 moles.

[0060] Specific examples of nonionic surfactants (B) include, for example, compounds obtained by adding alkylene oxide to laurylamine, compounds obtained by adding alkylene oxide to decyl alcohol, compounds obtained by adding alkylene oxide to lauryl alcohol, compounds obtained by adding alkylene oxide to sorbitan monostearate, compounds obtained by adding alkylene oxide to stearylamine, polyethylene glycol, compounds obtained by adding 25 moles of ethylene oxide to 1 mole of propylene glycol followed by the addition of 25 moles of propylene oxide, and compounds obtained by adding alkylene oxide to nonylphenol.

[0061] These nonionic surfactants (B) may be used individually or in combination of two or more as appropriate. The lower limit of the content of nonionic surfactant (B) in the treatment agent is set as appropriate, but is preferably 5% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more. When the content is 5% by mass or more, the carding properties of the fibers to which the treatment agent is applied can be particularly improved. The upper limit of the content of nonionic surfactant (B) is set as appropriate, but is preferably 80% by mass or less, more preferably 75% by mass or less. When the content is 80% by mass or less, the carding properties of the fibers to which the treatment agent is applied can be particularly improved. It should be noted that a range of arbitrary combinations of the above upper and lower limits is also conceivable. In the present invention, the content ratio of the nonionic surfactant (B) in the treatment agent is set to 5% by mass or more and 80% by mass or less.

[0062] The mass ratio of alkyl phosphate ester (A) and nonionic surfactant (B) in the treatment agent is set as appropriate, but it is preferable that alkyl phosphate ester (A) / nonionic surfactant (B) = 20 / 80 to 80 / 20. Defining it within this range can further improve curing properties.

[0063] (Potassium nitrogen-containing polycarboxylic acid salt (C)) The number of nitrogen atoms in one molecule of the nitrogen-containing polycarboxylic acid potassium salt (C) is not particularly limited, but is preferably 1 to 3. Furthermore, it may have an acyclic structure or a cyclic structure such as a cyclocyclic structure, but an acyclic compound is preferred. More preferably, the nitrogen-containing polycarboxylic acid potassium salt (C) is an acyclic compound with 1 to 3 nitrogen atoms per molecule. Using such a compound can further improve the antistatic properties. Examples of nitrogen-containing polycarboxylic acids constituting the nitrogen-containing polycarboxylic acid potassium salt (C) include amino polycarboxylic acids and imino polycarboxylic acids.

[0064] Potassium carboxylate salts (C) containing nitrogen, having 1 to 3 nitrogen atoms per molecule and being acyclic, specifically include those shown in the following general formulas (1) to (4).

[0065] [ka] R 1 ,R 2 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0066] [ka] R 3 ,R 4 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0067] [ka] R 5 ,R 7 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0068] R 6 ,R 8Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. m: 1 or 2.

[0069] (R 6 If there are two, then each R 6 (They may be the same or different.)

[0070] [ka] R 9 ,R 10 ,R 13 ,R 14 : Each of these is an independent residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having between 1 and 3 carbon atoms.

[0071] R 11 ,R 12 Each of these is independently a hydrogen atom, or a residue obtained by removing one hydrogen atom bonded to a carbon atom from a carboxylic acid having 1 to 3 carbon atoms. n: 1 or 2.

[0072] (R 11 If there are two, then each R 11 (They may be the same or different.) Specific examples of nitrogen-containing polycarboxylic acid potassium salts (C) include potassium salts of ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxyethylethylenediaminediacetic acid (DHEDDA), 1,3-propanediaminetetraacetic acid (1,3PDTA), diethylenetriaminepentaacetic acid (DTPA), triethylenetetraminehexaacetic acid (TTHA), nitrilotriacetic acid (NTA), iminodiacetic acid, hydroxyethyliminodiacetic acid (HIMDA), glutamic acid, glutamic acid diacetic acid, aspartic acid, aspartic acid diacetic acid (ASDA), ethylenediaminedisuccinic acid, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, 1,2-cyclohexanediaminetetraacetic acid, glycol etherdiaminetetraacetic acid, and others.

[0073] In the present invention, a compound selected from the above general formulas (1) to (4), hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, 1,3-propanediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethyliminodiacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, and glycol etherdiaminetetraacetic acid is applied.

[0074] These nitrogen-containing potassium polycarboxylate salts (C) may be used individually or in appropriate combinations of two or more types. The lower limit of the content of nitrogen-containing polycarboxylic acid potassium salt (C) in the treatment agent is set as appropriate, but is preferably 0.1% by mass or more, more preferably 0.2% by mass or more. When the content is 0.1% by mass or more, the carding and antistatic properties of the treated fibers can be particularly improved. The upper limit of the content of nitrogen-containing polycarboxylic acid potassium salt (C) is set as appropriate, but is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less. When the content is 15% by mass or less, the carding properties of the treated fibers can be particularly improved. A range of arbitrary combinations of the above upper and lower limits is also conceivable. In the present invention, the content of nitrogen-containing polycarboxylic acid potassium salt (C) in the treatment agent is set to 0.1% by mass or more and 15% by mass or less.

[0075] In the nonvolatile content of the treatment agent, it is preferable that the alkyl phosphate ester (A) is contained in an amount of 20% to 75% by mass, the nonionic surfactant (B) in an amount of 20% to 75% by mass, and the nitrogen-containing polycarboxylic acid potassium salt (C) in an amount of 0.2% to 5.0% by mass. It is also possible to consider ranges that are arbitrary combinations of the above upper and lower limits. By specifying the content ratio of each component within these ranges, the effects of the present invention can be further improved.

[0076] (Inorganic phosphoric acid (D)) The treatment agent may further contain the following inorganic phosphoric acid (D) to further improve the antistatic properties of the treated fibers. Inorganic phosphoric acid (D) is at least one selected from inorganic phosphoric acid and its metal salts.

[0077] Inorganic phosphoric acid may be orthophosphoric acid or polyphosphoric acid such as diphosphoric acid. Examples of metal salts include alkali metal salts and alkaline earth metal salts. Specific examples of alkali metals that make up alkali metal salts include sodium, potassium, and lithium. Examples of alkaline earth metals that make up alkaline earth metal salts include metals belonging to Group 2 elements, such as calcium, magnesium, beryllium, strontium, and barium. Specific examples of inorganic phosphoric acid (D) include dipotassium hydrogen phosphate and tripotassium phosphate.

[0078] These inorganic phosphoric acids (D) may be used individually or in combination of two or more as appropriate. The lower limit of the inorganic phosphoric acid (D) content in the treatment agent is set as appropriate, but is preferably greater than 0% by mass, preferably 0.1% by mass or more, and more preferably 0.5% by mass or more. When the content exceeds 0% by mass, the antistatic properties of the treated fibers can be further improved. The upper limit of the inorganic phosphoric acid (D) content is set as appropriate, but is preferably 10% by mass or less, and more preferably 5% by mass or less. When the content is 10% by mass or less, the scum accumulation after the treated fibers pass through each device can be improved. It should be noted that a range of arbitrary combinations of the above upper and lower limits is also conceivable.

[0079] In the nonvolatile content of the treatment agent, it is preferable that the alkyl phosphate ester (A) is contained in a proportion of 20% to 74.99% by mass, the nonionic surfactant (B) in a proportion of 20% to 74.99% by mass, the nitrogen-containing polycarboxylic acid potassium salt (C) in a proportion of 0.2% to 5.0% by mass, and the inorganic phosphoric acid (D) in a proportion of more than 0% to 5.0% by mass. A range arbitrarily combining the above upper and lower limits is also conceivable. By specifying the content proportion of each component within this range, the effects of the present invention can be further improved.

[0080] (Preservation form) The treatment agent may be composed of a single dosage form containing the alkyl phosphate ester (A), nonionic surfactant (B), nitrogen-containing polycarboxylic acid potassium salt (C), and inorganic phosphoric acid (D) as described above. Furthermore, from the viewpoint of improving formulation stability, it may be composed of a two-dosage form treatment agent as shown below.

[0081] The two-part treatment agent consists of a set comprising a first treatment agent for polyester synthetic fibers (hereinafter referred to as the "first treatment agent") containing an alkyl phosphate ester (A) and optionally inorganic phosphate (D), and a second treatment agent for polyester synthetic fibers (hereinafter referred to as the "second treatment agent") containing a nonionic surfactant (B). A nitrogen-containing polyvalent potassium carboxylate salt (C) is contained in at least one selected from the first and second treatment agents.

[0082] A two-part treatment agent consists of a first treatment agent and a second treatment agent, which is a separate agent from the first treatment agent, during storage or distribution. When using the two-part treatment agent, a mixture of the first and second treatment agents is prepared.

[0083] (solvent) The treatment agent of this embodiment may be compounded with a solvent as needed to prepare a treatment agent-containing composition or a diluted treatment agent. Examples of solvents include water and organic solvents. Specific examples of organic solvents include lower alcohols such as ethanol and propanol, and low-polarity solvents such as hexane and n-paraffin. These solvents may be used individually or in appropriate combinations of two or more. Among these, water is preferred from the viewpoint of excellent dispersibility or solubility of each component and excellent handling properties.

[0084] (Effects of the first embodiment) The effects of the treatment agent according to the first embodiment will be described. (1-1) The treatment agent of the first embodiment is configured to contain an alkyl phosphate ester (A) having an alkyl group having 16 to 22 C1 in its molecule, and at least one selected from alkali metal salts thereof, a nonionic surfactant (B), and a nitrogen-containing polyvalent potassium carboxylate salt (C). Therefore, the antistatic properties of synthetic fibers treated with the treatment agent can be improved, as can the curing properties. In addition, the smoothness of such synthetic fibers can be improved, and the scum deposition after passing through each device can be improved.

[0085] <Second Embodiment> Next, a second embodiment of the first treatment agent of the present invention will be described. The following description will focus on the differences from the above embodiment.

[0086] The first treatment agent of this embodiment contains the alkyl phosphate ester (A) and optionally the inorganic phosphate (D). The first treatment agent is used in combination with the second treatment agent, which contains the nonionic surfactant (B), at the time of use. At least one selected from the first and second treatment agents contains the nitrogen-containing polycarboxylic acid potassium salt (C). A mixture of the first and second treatment agents is prepared at the time of use.

[0087] The alkyl phosphate ester (A), nonionic surfactant (B), nitrogen-containing polyvalent potassium carboxylate (C), and inorganic phosphoric acid (D) are the same components as those described in the first embodiment.

[0088] Furthermore, the content of each component in the treatment agent—alkyl phosphate ester (A), nonionic surfactant (B), nitrogen-containing polycarboxylic acid potassium salt (C), and inorganic phosphate (D)—is the same as described in the first embodiment.

[0089] Furthermore, the first treatment agent may be composed of a first treatment agent-containing composition or a first treatment agent dilution by incorporating the solvent described in the first embodiment section. (Effects of the second embodiment) The effects of the first treatment agent in the second embodiment will now be described. In addition to the effects of the above embodiment, the second embodiment has the following effects.

[0090] (2-1) In the second embodiment, the first treatment agent contains an alkyl phosphate ester (A) and optionally an inorganic phosphate (D), and is used in combination with a second treatment agent containing a nonionic surfactant (B) at the time of use. Therefore, the formulation stability, especially the storage stability, of the first treatment agent can be improved. Furthermore, the components of the resulting treatment agent can be adjusted by adjusting the mixing ratio with the second treatment agent. In addition, the first treatment agent alone can be distributed as a separate product from the second treatment agent.

[0091] <Third Embodiment> Next, a third embodiment embodying the second treatment agent of the present invention will be described. The following description will focus on the differences from the above embodiment.

[0092] The second treatment agent of this embodiment contains the nonionic surfactant (B). The second treatment agent is used in combination with the first treatment agent, which contains the alkyl phosphate ester (A) and optionally the inorganic phosphate (D), at the time of use. At least one selected from the first and second treatment agents contains the nitrogen-containing polycarboxylic acid potassium salt (C). A mixture of the first and second treatment agents is prepared at the time of use.

[0093] The alkyl phosphate ester (A), nonionic surfactant (B), nitrogen-containing polyvalent potassium carboxylate (C), and inorganic phosphoric acid (D) are the same components as those described in the first embodiment.

[0094] Furthermore, the content of each component in the treatment agent—alkyl phosphate ester (A), nonionic surfactant (B), nitrogen-containing polycarboxylic acid potassium salt (C), and inorganic phosphate (D)—is the same as described in the first embodiment.

[0095] Furthermore, the second treatment agent may be composed of a second treatment agent-containing composition or a diluted second treatment agent solution by incorporating the solvent described in the section on the first embodiment. (Effects of the third embodiment) The effects of the second treatment agent in the third embodiment will now be described. In addition to the effects of the above embodiment, the third embodiment has the following effects.

[0096] (3-1) In the third embodiment, the second treatment agent contains a nonionic surfactant (B) and is used in combination with the first treatment agent, which contains an alkyl phosphate ester (A) and optionally an inorganic phosphate (D) at the time of use. Therefore, the formulation stability, especially the storage stability, of the second treatment agent can be improved. Furthermore, the components of the resulting treatment agent can be adjusted by adjusting the mixing ratio with the first treatment agent. In addition, the second treatment agent can be distributed separately from the first treatment agent.

[0097] <Fourth Embodiment> Next, a fourth embodiment of the polyester-based synthetic fiber (hereinafter referred to as "synthetic fiber") of the present invention will be described.

[0098] The synthetic fibers of this embodiment have the treatment agent of the first embodiment attached to them. In the method for producing the synthetic fibers of this embodiment, in the case of a one-component treatment agent, the method includes a step of applying a diluted solution containing a solvent and the treatment agent of the first embodiment to the polyester synthetic fibers. A method for preparing the diluted solution is, for example, to add the treatment agent of the first embodiment or a treatment agent-containing composition to a solvent. Preferably, the diluted solution is prepared by adding the treatment agent of the first embodiment to water.

[0099] In the case of a two-part treatment agent, the treatment agent is characterized by applying a diluted solution containing a solvent, the first treatment agent of the second embodiment, and the second treatment agent of the third embodiment to a polyester synthetic fiber. The ratio of the content of the first treatment agent to the second treatment agent is preferably 95 / 5 to 5 / 95 as the mass ratio of nonvolatile content. By defining it within this range, operability can be improved.

[0100] Examples of solvents used in the preparation of the diluent include those exemplified in the first embodiment. From the viewpoint of ease of handling, the concentration of the treatment agent in the diluent is preferably 0.1% by mass or more and 10% by mass or less.

[0101] In the configuration using both the first and second treatment agents, the mixing ratio of each agent can be arbitrarily changed. Therefore, even under different manufacturing conditions such as differences in manufacturing equipment or climate (temperature, humidity, etc.), it becomes easy to fine-tune the mixing ratio to prepare a treatment agent or diluent that always imparts the optimal fiber characteristics or fiber manufacturing characteristics.

[0102] The method for treating synthetic fibers involves applying the diluted solution obtained as described above to the synthetic fibers in at least one of the processes, such as the spinning process, drawing process, and finishing process, for polyester-based synthetic fibers.

[0103] Examples of synthetic fibers to which the treatment agent is applied include polyester synthetic fibers. Specific examples of polyester synthetic fibers include polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polylactic acid, and composite fibers containing these polyester resins.

[0104] The uses of synthetic fibers are not particularly limited and include, for example, spinning, manufacturing spun yarn, short fibers, long fibers, nonwoven fabrics, and stuffing. Short fibers generally refer to what are called staples and do not include long fibers, which are generally called filaments. The length of the short fibers is not particularly limited as long as they qualify as short fibers in this art, but for example, it is 100 mm or less. Among these, the treatment agent of the present invention is preferably applied to polyester short fibers and polyester-based synthetic fibers for manufacturing spun yarn.

[0105] There are no particular restrictions on the proportion of the diluted solution that should be applied to the synthetic fiber, but the diluted solution should be applied to the synthetic fiber such that the final non-volatile content is preferably 0.01% to 10% by mass, more preferably 0.1% to 3% by mass. With this configuration, the effects of each component can be effectively exerted. Furthermore, there are no particular restrictions on the method of applying the diluted solution, and known methods such as roller lubrication, guide lubrication using a metering pump, immersion lubrication, and spray lubrication can be used depending on the type, form, and application of the synthetic fiber. When immersion lubrication is used, the immersion time is preferably 1 minute to 5 minutes.

[0106] The synthetic fibers to which the diluent has been applied may be dried or heat-treated using a known method. By drying or heat-treating, the solvent such as water is evaporated, and synthetic fibers to which the treatment agent, or the components contained in the first and second treatment agents, are attached are obtained.

[0107] (Effects of the fourth embodiment) The effects of the synthetic fiber of the fourth embodiment will now be described. In addition to the effects of the above embodiments, the fourth embodiment has the following effects.

[0108] (4-1) In the synthetic fiber of the fourth embodiment, the treatment agent of the first embodiment is attached. Therefore, the antistatic properties of the synthetic fiber can be improved, as can the carding properties. In addition, the smoothness of the synthetic fiber can be improved, and the scum accumulation after passing through each device can be improved.

[0109] Furthermore, in the case of a multi-component formulation, the first and second treatment agents are added to the solvent immediately before use, allowing the treatment agents to be applied to the fibers in a state of good emulsification stability. Therefore, the efficacy of each component for spinning, yarn manufacturing, short fibers, long fibers, nonwoven fabrics, stuffing, etc., can be effectively exerted.

[0110] (Example of change) The above embodiment may be modified as follows. The above embodiment and the following modifications can be combined and implemented to the extent that they do not contradict each other technically.

[0111] The processing agents, processing agent-containing compositions, or diluents of the above embodiments may further contain other components used in conventional processing agents, such as other solvents, stabilizers, antistatic agents, binders, antioxidants, ultraviolet absorbers, organic acids, and surfactants other than those mentioned above, in order to maintain the quality of each processing agent, to the extent that they do not impede the effects of the present invention. The other components used in conventional processing agents, other than solvents, are preferably present in 40% by mass or less, and more preferably 10% by mass or less, in each processing agent from the viewpoint of efficiently exhibiting the efficacy of the present invention. Furthermore, these other components may be stored as separate agents from the processing agents described above. [Examples]

[0112] The following examples illustrate the structure and effects of the present invention in more detail, but the present invention is not limited to these examples. In the following examples and comparative examples, "parts" refers to parts by mass, and "%" refers to mass percent.

[0113] Test category 1 (Preparation of treatment agent) (Example 1-1) As shown in Example 1-1 of Table 1, 40 parts (%) of stearyl phosphate potassium salt (acid value 5 mg KOH / g) (A-1a) was used as the alkyl phosphate ester (A), 27.9 parts (%) of a compound (B-1) obtained by adding 15 moles of ethylene oxide to 1 mole of laurylamine as the nonionic surfactant (B), 18.6 parts (%) of a compound (B-2) obtained by adding 4 moles of ethylene oxide to 1 mole of decyl alcohol, followed by the addition of 3 moles of propylene oxide, and 6 moles of ethylene oxide to 1 mole of lauryl alcohol, propylene oxide The treatment agent for Example 1-1 was prepared, containing 3.4 parts (%) of a compound (B-3) to which 2 moles of pyrene oxide were randomly added, 5.9 parts of a compound (B-4) to which 9 moles of ethylene oxide were added to 1 mole of lauryl alcohol, 0.9 parts (%) of tetrapotassium ethylenediaminetetraacetate (C-1) as a nitrogen-containing polycarboxylic acid potassium salt (C), 0.6 parts (%) of dipotassium hydrogen phosphate (D-1) as an inorganic phosphoric acid (D), 0.7 parts (%) of potassium oleate (F-1) as other components (F), and 2.0 parts (%) of ethylene glycol (F-2).

[0114] (Examples 1-2 to 1-26, Comparative Examples 1 to 9) Each of the treatment agents in Examples 1-2 to 1-26 and Comparative Examples 1 to 9 was prepared using the components shown in Table 1, in the same manner as in Example 1.

[0115] The types and content of alkyl phosphate esters (A), nonionic surfactants (B), nitrogen-containing polycarboxylic acid potassium salts (C), inorganic phosphoric acid (D), and other components (F) in the treatment agent for each example are shown in the "Alkyl Phosphate Esters (A)" column, "Nonionic Surfactants (B)" column, "Nitrogen-containing Polycarboxylic Acid Potassium Salts (C)" column, "Inorganic Phosphate (D)" column, and "Other Components (F)" column of Table 1, respectively.

[0116] [Table 1] The details of the alkyl phosphate esters (A), nonionic surfactants (B), nitrogen-containing polycarboxylic acid potassium salts (C), inorganic phosphates (D), and other components (F) listed in Table 1 are as follows.

[0117] <Alkyl phosphate salt (A)> A-1a: Stearyl phosphate potassium salt (acid value 5 mg KOH / g) A-1b: Stearyl phosphate potassium salt (acid value 10 mg KOH / g) A-1c: Stearyl phosphate potassium salt (acid value 2.5 mg KOH / g) A-1d: Stearyl phosphate potassium salt (acid value 90 mg KOH / g) A-2: Cetyl phosphate potassium salt (acid value 15 mg KOH / g) A-3: Eicosyl phosphate potassium salt (acid value 10 mg KOH / g) A-4: Behenyl phosphate potassium salt (acid value 15 mg KOH / g) ra-1: Octyl phosphate potassium salt (acid value 10 mg KOH / g) ra-2a: Lauryl phosphate potassium salt (acid value 10 mg KOH / g) ra-2b: Lauryl phosphate potassium salt (acid value 0 mg KOH / g) <Nonionic surfactant (B)> B-1: A compound obtained by adding 15 moles of ethylene oxide to 1 mole of laurylamine. B-2: A compound obtained by adding 4 moles of ethylene oxide to 1 mole of decyl alcohol, followed by the addition of 3 moles of propylene oxide. B-3: A compound obtained by randomly adding 6 moles of ethylene oxide and 2 moles of propylene oxide to 1 mole of lauryl alcohol. B-4: A compound obtained by adding 9 moles of ethylene oxide to 1 mole of lauryl alcohol. B-5: A compound obtained by adding 5 moles of ethylene oxide to 1 mole of lauryl alcohol. B-6: A compound obtained by adding 9 moles of ethylene oxide to 1 mole of lauryl alcohol. B-7: A compound obtained by adding 10 moles of ethylene oxide to 1 mole of laurylamine. B-8: A compound obtained by adding 20 moles of ethylene oxide to 1 mole of sorbitan monostearate. B-9: A compound obtained by adding 1 mole of ethylene oxide to 1 mole of stearylamine, followed by the addition of 5 moles of propylene oxide. B-10: Polyethylene glycol (mass-average molecular weight 220) B-11: A compound obtained by adding 25 moles of ethylene oxide to 1 mole of propylene glycol, followed by the addition of another 25 moles of propylene oxide. B-12: A compound obtained by adding 10 moles of ethylene oxide to 1 mole of nonylphenol. <Potassium nitrogen-containing polycarboxylic acid salt (C)> C-1: Tetrapotassium ethylenediaminetetraacetate C-2: Dipotassium ethylenediaminetetraacetate C-3: Pentapotassium diethylenetriaminepentaacetate C-4: Tripotassium ethylenediamine disuccinate C-5: Dipotassium iminodiacetate C-6: Monopotassium glutamate C-7:1,4,7,10-Tetraazacyclododecane-1,4,7,10-Tetrapotassium tetraacetate C-8:1,4,7,10-Tetraazacyclododecane-1,4,7,10-Dipotassium tetraacetate rc-1: Disodium ethylenediaminetetraacetate rc-2: Ethylenediamine disuccinate trisodium <Inorganic phosphoric acid (D)> D-1: Dipotassium hydrogen phosphate salt D-2: Tripotassium phosphate (Other ingredients) F-1: Potassium oleate F-2: Ethylene glycol F-3: Dimethyl Silicone F-4: Succinic acid F-5: Sodium lauryl sulfate F-6: Propylene glycol Test category 2 (Adhesion of treatment agent to polyester fibers) Each treatment agent prepared in test category 1 was diluted with deionized water to prepare a 0.15% diluted solution of the treatment agent. This diluted solution of the treatment agent was then processed using a fineness of 1.3 × 10⁶ particles. -4 The treatment agent was applied to 38mm long polyester fibers at a weight of g / m by spray application to achieve a 0.15% adhesion rate. The fibers were then dried in an 80°C hot air dryer for 2 hours, and conditioned overnight in a 25°C × 40%RH atmosphere to obtain polyester fibers with the treatment agent applied.

[0118] Test category 3 (evaluation of antistatic properties) 20g of polyester fiber obtained in test category 2 was used to make miniature cards under an atmosphere of 25°C × 40% RH. The static electricity of the spun card web was measured using a digital electrostatic potential meter at a distance of 1 cm from the card web, and the antistatic properties were judged according to the following criteria. The results are shown in the "Antistatic Properties" column of Table 1.

[0119] • Evaluation criteria for antistatic properties 5 (Excellent): Static electricity generation is less than 0.1kV 4 (Excellent): Static electricity generation is between 0.1kV and 0.2kV. 3 (Good): Static electricity generation is 0.2kV or more and less than 0.3kV. 2 (OK): Static electricity generation is 0.3kV or more and less than 0.6kV 1 (Not allowed): Static electricity generation is 0.6kV or higher Test category 4 (Evaluation of scum accumulation) Three kilograms of polyester fiber obtained in test category 2 were subjected to a flat carding process to obtain card sliver. The obtained card sliver was subjected to a mixing machine at 25°C in a 65% RH atmosphere, and passed through five times at a spinning speed of 250 m / min. The degree of scum in each part of the mixing machine's trumpet was visually assessed according to the following criteria. The results are shown in the "Scum Accumulation" column of Table 1.

[0120] • Criteria for evaluating scum accumulation 3 (Good): Scum is less than 5% of the trumpet's surface area. 2 (OK): Scum is between 5% and 10% of the trumpet's surface area. 1 (Not acceptable): Scum covers more than 10% of the trumpet's surface area. Test category 5 (evaluation of smoothness) Using 10 kg of polyester fiber obtained in test category 2, card sliver was obtained by passing it through a flat card (manufactured by Howa Kogyo Co., Ltd.) under a 25°C × 40% RH atmosphere. The obtained card sliver was examined using a scanning electron microscope (manufactured by JEOL Ltd.). Ten or more polyester fibers constituting the card sliver were examined, and the smoothness was evaluated based on the number of friction damages on the fiber surface according to the following criteria. The results are shown in the "Smoothness" column of Table 1.

[0121] • Evaluation criteria for smoothness 3 (Good): Fewer than 2 scratches per fiber on the surface. 2 (Acceptable): On average, there are 2 or more scratches on the fiber surface per fiber, but less than 3. 1 (Unacceptable): An average of 3 or more scratches on the fiber surface per fiber. Examination Category 6 (Evaluation of Card-Based Skills) 20g of polyester fiber coated with each treatment agent prepared in Test Category 2 was conditioned for 24 hours in a constant temperature room at 20°C and 65% RH, and then subjected to a miniature carding machine. The ratio of discharged material to input material was calculated as the carding rate (%) using the following formula (1), and the carding properties were evaluated according to the following evaluation criteria. The results are shown in the "Carding Properties" column of Table 1.

[0122]

number

[0123] Test Category 7 (Preparation of a composition containing the first treatment agent of a two-part treatment agent) (Compositions containing the first treatment agent (I-1) to (I-26)) Each component was weighed to achieve the proportions shown in Table 2, and these were stirred and mixed to prepare the first treatment agent-containing compositions (I-1) to (I-26).

[0124] The types and content of alkyl phosphate esters (A), nitrogen-containing polycarboxylic acid potassium salts (C), inorganic phosphoric acid (D), other components (F), and the content of water as a solvent in compositions (I-1) to (I-26) of the first treatment agent are shown in the "Alkyl phosphate ester (A)" column, the "Nitrogen-containing polycarboxylic acid potassium salt (C)" column, the "Inorganic phosphoric acid (D)" column, the "Other components (F)" column, and the "Solvent" column, respectively, in Table 2.

[0125] [Table 2] Test category 8 (Preparation of a composition containing the second treatment agent for a two-part treatment agent) Each component was weighed to achieve the proportions shown in Table 3, and these were stirred and mixed to prepare the second treatment agent-containing compositions (II-1) to (II-26).

[0126] The types and content of nonionic surfactants (B), nitrogen-containing polycarboxylic acid potassium salts (C), other components (F), and the content of water as a solvent in compositions (II-1) to (II-26) containing the second treatment agent are shown in the "Nonionic Surfactants (B)" column, the "Nitrogen-containing Polycarboxylic Acid Potassium Salts (C)" column, the "Other Components (F)" column, and the "Solvent" column, respectively, in Table 3.

[0127] [Table 3] Test Category 9 (Evaluation of formulation stability of the composition containing the first treatment agent and the composition containing the second treatment agent) Ten mL of each prepared example of the composition containing the first and second treatment agents was placed in a test tube, and its stability was determined by visual observation according to the following criteria. The results are shown in the "Formulation Stability" column of Tables 2 and 3.

[0128] • Criteria for evaluating the stability of pharmaceutical formulations 2 (OK): No separation or precipitate present immediately after preparation. 1 (Not acceptable): If separation or precipitation is observed immediately after preparation. Test Category 10 (Preparation of treatment agent-containing compositions and treatment agent dilutions from the first treatment agent-containing composition and the second treatment agent-containing composition) (Example 2-1) A treatment agent-containing composition was obtained by mixing 64% (parts) of the first treatment agent-containing composition (I-1) shown in Table 2 and 36% (parts) of the second treatment agent-containing composition (II-1) shown in Table 3. This mixture was then combined with deionized water to prepare a diluted solution of the 0.15% treatment agent of Example 2-1.

[0129] (Examples 2-2 to 2-26) In the same manner as in Example 2-1, the first treatment agent-containing composition shown in Table 2, the second treatment agent-containing composition shown in Table 3, and deionized water were mixed to prepare the treatment agent dilutions for each example.

[0130] The types and content of the first treatment agent-containing compositions and the types and content of the second treatment agent-containing compositions are shown in the "First Treatment Agent-Containing Composition" column and the "Second Treatment Agent-Containing Composition" column of Table 4, respectively.

[0131] [Table 4] Test Category 11 (Evaluation of two-part treatment agent-containing compositions) The treatment agent-containing compositions obtained in each example, such as Example 2-1, were evaluated for antistatic properties, smoothness, curdling properties, and scum deposition properties using the same method as for the treatment agent in Example 1-1. The results are shown in the "Antistatic Properties," "Smoothness," "Cardling Properties," and "Scum Deposition Properties" columns of Table 4, respectively.

[0132] From the results in the table above, the present invention can improve the antistatic properties, smoothness, and carding properties of synthetic fibers treated with a two-part treatment agent. Furthermore, it can improve the scum accumulation of fibers treated with the treatment agent after they pass through various equipment.

[0133] Next, the technical concepts that can be understood from the above embodiments and alternative examples are described below. The treatment agent for polyester synthetic fibers according to embodiment 11 is characterized by containing the following alkyl phosphate ester (A), nonionic surfactant (B), and nitrogen-containing polyvalent potassium carboxylate salt (C).

[0134] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Embodiment 12 is a treatment agent for polyester synthetic fibers described in Embodiment 11, wherein the nitrogen-containing polyvalent potassium carboxylate (C) has 1 to 3 nitrogen atoms per molecule and is acyclic.

[0135] Embodiment 13 is a treatment agent for polyester synthetic fibers according to Embodiment 11 or 12, wherein the mass ratio of the alkyl phosphate ester (A) and the nonionic surfactant (B) in the treatment agent for polyester synthetic fibers is alkyl phosphate ester (A) / nonionic surfactant (B) = 20 / 80 to 80 / 20.

[0136] Embodiment 14 is a treatment agent for polyester synthetic fibers according to any one embodiment of Embodiments 11 to 13, wherein the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% to 75% by mass, the nonionic surfactant (B) in an amount of 20% to 75% by mass, and the nitrogen-containing polyvalent potassium carboxylate (C) in an amount of 0.2% to 5.0% by mass.

[0137] Embodiment 15 is a treatment agent for polyester synthetic fibers according to any one embodiment of Embodiments 11 to 14, wherein the alkyl group constituting the alkyl phosphate ester (A) has 16 or more carbon atoms and 18 or fewer carbon atoms.

[0138] Embodiment 16 is a treatment agent for polyester synthetic fibers according to any one embodiment of Embodiments 11 to 15, further containing the following inorganic phosphoric acid (D). Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

[0139] Embodiment 17 is a treatment agent for polyester synthetic fibers described in Embodiment 16, wherein the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% to 74.99% by mass, the nonionic surfactant (B) in an amount of 20% to 74.99% by mass, the nitrogen-containing polyvalent potassium carboxylate (C) in an amount of 0.2% to 5.0% by mass, and the inorganic phosphoric acid (D) in an amount of more than 0% to 5.0% by mass.

[0140] The first treatment agent for polyester synthetic fibers according to embodiment 18 is a first treatment agent for polyester synthetic fibers used in combination with a second treatment agent for polyester synthetic fibers containing a nonionic surfactant (B), characterized in that at least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contains a nitrogen-containing polyvalent potassium carboxylate (C), and contains the following alkyl phosphate ester (A) and optionally the following inorganic phosphate (D).

[0141] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

[0142] The second treatment agent for polyester synthetic fibers according to embodiment 19 is a second treatment agent for polyester synthetic fibers used in combination with a first treatment agent for polyester synthetic fibers containing the following alkyl phosphate ester (A) and optionally the following inorganic phosphate (D), characterized in that at least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contains a nitrogen-containing polyvalent potassium carboxylate (C) and contains a nonionic surfactant (B).

[0143] Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

[0144] The polyester synthetic fiber of embodiment 20 is characterized in that it has the treatment agent for polyester synthetic fibers described in any one embodiment of embodiments 11 to 17 attached to it.

Claims

1. A treatment agent for polyester synthetic fibers, characterized by containing the following alkyl phosphate ester (A), nonionic surfactant (B), and nitrogen-containing polyvalent potassium carboxylate salt (C). Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof.

2. The treatment agent for polyester synthetic fibers according to claim 1, wherein the nitrogen-containing polycarboxylic acid potassium salt (C) has 1 to 3 nitrogen atoms per molecule and is acyclic.

3. The treatment agent for polyester synthetic fibers according to claim 1, wherein the mass ratio of the alkyl phosphate ester (A) and the nonionic surfactant (B) is alkyl phosphate ester (A) / nonionic surfactant (B) = 20 / 80 to 80 / 20.

4. The treatment agent for polyester synthetic fibers according to claim 1, wherein the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% to 75% by mass, the nonionic surfactant (B) in an amount of 20% to 75% by mass, and the nitrogen-containing polyvalent potassium carboxylate salt (C) in an amount of 0.2% to 5.0% by mass.

5. The treatment agent for polyester synthetic fibers according to claim 1, wherein the alkyl group constituting the alkyl phosphate ester (A) has 16 or more carbon atoms and 18 or fewer carbon atoms.

6. Furthermore, the treatment agent for polyester synthetic fibers according to claim 1, further containing the inorganic phosphoric acid (D) described below. Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

7. The treatment agent for polyester synthetic fibers according to claim 6, wherein the nonvolatile content of the treatment agent for polyester synthetic fibers contains the alkyl phosphate ester (A) in an amount of 20% by mass or more and 74.99% by mass or less, the nonionic surfactant (B) in an amount of 20% by mass or more and 74.99% by mass or less, the nitrogen-containing polyvalent potassium carboxylate salt (C) in an amount of 0% by mass or more and 5.0% by mass or less, and the inorganic phosphoric acid (D) in an amount of more than 0% by mass and 5.0% by mass or less.

8. A first treatment agent for polyester synthetic fibers, which is used in combination with a second treatment agent for polyester synthetic fibers containing a nonionic surfactant (B), At least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contains a nitrogen-containing polyvalent potassium salt (C), A first treatment agent for polyester synthetic fibers, characterized by containing the following alkyl phosphate ester (A) and optionally the following inorganic phosphate (D). Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

9. A second treatment agent for polyester synthetic fibers, which is used in combination with a first treatment agent for polyester synthetic fibers containing the alkyl phosphate ester (A) and optionally the inorganic phosphate (D) described below, At least one selected from the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contains a nitrogen-containing polyvalent potassium salt (C), A second treatment agent for polyester synthetic fibers, characterized by containing a nonionic surfactant (B). Alkyl phosphate ester (A): At least one selected from alkyl phosphate esters having an alkyl group with 16 to 22 carbon atoms in the molecule, and alkali metal salts thereof. Inorganic phosphoric acid (D): At least one selected from inorganic phosphoric acid and its metal salts.

10. A polyester synthetic fiber characterized by having a treatment agent for polyester synthetic fibers described in any one of claims 1 to 7 attached to it.

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