Synthetic fiber treatment agent and synthetic fiber

Abstract

The present invention addresses the problem of providing a synthetic fiber treatment agent and the like capable of achieving both improvement in rubber adhesion of synthetic fibers to which the synthetic fiber treatment agent has been imparted and reduction in scum. This synthetic fiber treatment agent contains a smoothing agent and a nonionic surfactant. The smoothing agent contains a complete ester compound of a polyol and a monovalent fatty acid. The non-ionic surfactant contains a compound (A) obtained by esterifying a 2-to 5-membered polyol having a (poly) oxyalkylene group and a fatty acid (A1) containing a monovalent unsaturated fatty acid having two or more unsaturated bonds.

Description

Technical Field

[0001] The present invention relates to a synthetic fiber treating agent capable of improving rubber adhesion of synthetic fibers provided with the synthetic fiber treating agent and reducing scum, and synthetic fibers provided with the synthetic fiber treating agent. Background Art

[0002] In the spinning and stretching process of synthetic fibers, a treatment is sometimes performed to allow a synthetic fiber treatment agent to adhere to the surface of the synthetic fibers in order to improve smoothness, antistatic properties, and the like. Conventionally, there is known a synthetic fiber treatment agent disclosed in Patent Document 1. Patent Document 1 discloses a synthetic fiber treatment agent containing a sulfonic acid compound having an alkenyl group, a sulfonic acid compound having a hydroxyalkyl group, and a sulfonic acid compound having a sulfonic group-containing hydrocarbon group. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-046647 Summary of the invention Problems to be solved by the invention

[0004] However, conventional synthetic fiber treating agents have a problem that both the improvement in rubber adhesion of synthetic fibers to which the synthetic fiber treating agents are applied and the effect of reducing scum cannot be sufficiently achieved. Means for solving problems

[0005] The present inventors have conducted studies to solve the above-mentioned problems and have found that a synthetic fiber treatment agent preferably contains a predetermined smoothing agent and a nonionic surfactant. Various methods for solving the above-mentioned problems are described.

[0006] The processing agent for synthetic fibers of embodiment 1 is characterized in that it contains a smoothing agent and a nonionic surfactant, wherein the smoothing agent comprises a complete ester compound of a polyol and a monovalent fatty acid, and the nonionic surfactant comprises a compound (A), which is esterified between a polyol having a valence of more than 2 and less than 5 and having a (poly)oxyalkylene group and a fatty acid (A1) comprising a monovalent unsaturated fatty acid having more than 2 unsaturated bonds.

[0007] Regarding aspect 2, in the synthetic fiber processing agent according to aspect 1, the fatty acid (A1) contains at least one selected from a monounsaturated fatty acid having two unsaturated bonds and a monounsaturated fatty acid having three unsaturated bonds.

[0008] Regarding embodiment 3, in the synthetic fiber processing agent according to embodiment 1 or 2, the compound (A) is contained in the synthetic fiber processing agent at a ratio of 0.1 mass % to 20 mass %. Regarding mode 4, in the synthetic fiber treatment agent described in any one of modes 1 to 3, the above-mentioned nonionic surfactant further contains a compound (B), which is esterified by a polyol having a valence of more than 2 and less than 5 and having a (poly)oxyalkylene group and a fatty acid (B1) containing a monovalent unsaturated fatty acid having one unsaturated bond.

[0009] Regarding embodiment 5, in the synthetic fiber processing agent according to embodiment 4, the mass ratio of the compound (A) to the compound (B) in the synthetic fiber processing agent is compound (A) / compound (B)=40 / 60 to 5 / 95.

[0010] Regarding embodiment 6, in the synthetic fiber processing agent described in embodiment 4 or 5, the above-mentioned nonionic surfactant further comprises a compound (C), which is a polyol having a valence of more than 2 and less than 5 and having a (poly)oxyalkylene group and a fatty acid (C1) comprising a monovalent saturated fatty acid, and when the total content ratio of the above-mentioned compound (A), the above-mentioned compound (B) and the above-mentioned compound (C) is set to 100% by mass, the above-mentioned compound (A) and the above-mentioned compound (B) are contained in a total ratio of more than 70% by mass.

[0011] Regarding aspect 7, in the synthetic fiber processing agent described in any one of aspects 1 to 6, the smoothing agent further contains a sulfur-containing ester compound. In aspect 8, the synthetic fiber processing agent described in any one of aspects 1 to 7 further contains an ionic surfactant.

[0012] The synthetic fiber of aspect 9 is characterized in that the synthetic fiber treatment agent described in any one of aspects 1 to 8 is adhered thereto. Effects of the Invention

[0013] According to the present invention, it is possible to achieve both an improvement in rubber adhesion of synthetic fibers to which the synthetic fiber treating agent is applied and an effect of reducing scum. DETAILED DESCRIPTION

[0014] <First Embodiment> The first embodiment of the synthetic fiber treatment agent (hereinafter also referred to as the treatment agent) of the present invention will be described below. The treatment agent of this embodiment contains a predetermined smoothing agent and a nonionic surfactant. The treatment agent may further contain an ionic surfactant.

[0015] (Smoothing Agent) The smoothing agent provided in the treatment agent of this embodiment comprises a complete ester compound of a polyol and a monovalent fatty acid. The complete ester compound is preferably a complete ester compound of a polyol having a chain structure of 3 to 6 carbon atoms and a monovalent fatty acid having 8 to 24 carbon atoms.

[0016] The polyol preferably has a chain structure, and the chain structure may be linear or branched. Specific examples of the polyol include ethylene glycol, propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2-methyl-1,2-propylene glycol, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 2-methyl-2,4-pentanediol, 2,3-dimethyl-2,3-butylene glycol, glycerol, diglycerol, 2-methyl-2-hydroxymethyl-1,3-propylene glycol, trimethylolpropane, pentaerythritol, sorbitol, etc. Among these, glycerol and trimethylolpropane are preferred.

[0017] As the monovalent fatty acid, a known monovalent fatty acid can be appropriately adopted, and it may be a saturated fatty acid or an unsaturated fatty acid. In addition, it may be a straight-chain fatty acid or a fatty acid having a branched structure.

[0018] Specific examples of monovalent fatty acids include: (1) straight-chain saturated fatty acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid (caprylic acid), caprylic acid (caprylic acid), nonanoic acid, capric acid (capric acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), docosanoic acid (behenic acid), and tetradecanoic acid; (2) branched-chain saturated fatty acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, and isooctadecanoic acid; (3) straight-chain unsaturated fatty acids such as crotonic acid, myristic acid, palmitoleic acid, oleic acid, vaccenic acid, eicosenoic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidonic acid; (4) hydroxy fatty acids such as ricinoleic acid; and the like.

[0019] Specific examples of complete ester compounds include triesters of trimethylolpropane and fatty acids, such as triesters of trimethylolpropane and mixed acids (palm kernel fatty acids and vegetable oleic acid); triesters of glycerol and fatty acids, such as triesters of glycerol and mixed acids (palm kernel fatty acids and vegetable oleic acid); and natural oils and fats such as coconut oil, rapeseed oil, rapeseed refined oil, sunflower oil, soybean oil, castor oil, sesame oil, palm oil, and fish oil; and the like.

[0020] These complete ester compounds may be used alone or in combination of two or more. In the treating agent, the lower limit of the ratio of the complete ester compound of polyol and monobasic fatty acid is preferably 15 mass % or more, more preferably 20 mass % or more, and can also be 26 mass % or more, 30 mass % or more, 40 mass % or more, 50 mass % or more, or 55 mass % or more. The upper limit of the ratio of the complete ester compound of polyol and monobasic fatty acid is preferably 70 mass % or less, more preferably 60 mass % or less, and can also be 55 mass % or less, 50 mass % or less, 40 mass % or less, or 30 mass % or less. By being defined as the scope of this ratio, the effect of the present invention can be further improved. It should be noted that the scope of any combination of the above-mentioned upper and lower limits can also be envisioned.

[0021] The smoothing agent in the treatment agent of the present embodiment preferably further contains a sulfur-containing ester compound. When the smoothing agent further contains a sulfur-containing ester compound, scum generated on a yarn guide or the like can be further reduced for the synthetic fiber to which the treatment agent is applied.

[0022] Specific examples of the sulfur-containing ester compound include dioctyl thiodipropionate, diisolauryl thiodipropionate, dilauryl thiodipropionate, diisocetyl thiodipropionate, diisopalmityl thiodipropionate, diisocosyl thiodipropionate, diisostearyl thiodipropionate, dioleyl thiodipropionate, octyl thiodipropionate, isolauryl thiodipropionate, lauryl thiodipropionate, isocetyl thiodipropionate, isostearyl thiodipropionate, oleyl thiodipropionate, octyl mercaptopropionate, stearyl mercaptopropionate, trimethylolpropane tris(mercaptopropionate), etc. Among these, ester compounds of thiodipropionic acid and an alcohol having a branched structure or an alcohol having an unsaturated bond are preferred from the viewpoint of compatibility in the treatment agent.

[0023] These sulfur-containing ester compounds may be used alone or in combination of two or more. In the treatment agent, the lower limit of the content ratio of the sulfur-containing ester compound is preferably 0.5% by mass or more, more preferably 1% by mass or more, and may be 2% by mass or more, 3% by mass or more, 5% by mass or more, 10% by mass or more, or 15% by mass or more. The upper limit of the content ratio of the sulfur-containing ester compound is preferably 30% by mass or less, more preferably 25% by mass or less, and may be 20% by mass or less, 15% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. By specifying the range of the content ratio, the effect of the present invention can be obtained, especially for synthetic fibers to which the treatment agent is applied, the scum generated on the yarn guide and the like can be further reduced. It should be noted that the range formed by arbitrarily combining the above upper and lower limits can also be envisioned.

[0024] The smoothing agent provided in the treatment agent of the present embodiment may contain other ester compounds other than those mentioned above. Specific examples of other ester compounds include: (1) ester compounds of aliphatic monohydric alcohols such as octyl palmitate, oleyl laurate, oleyl oleate, isotridecyl stearate, isocosanyl oleate, isostearyl erucate and aliphatic monocarboxylic acids; (2) complete ester compounds of aliphatic monohydric alcohols such as diisostearyl adipate, dioleyl adipate, dioleyl azelate and aliphatic polycarboxylic acids; (3) ester compounds of aromatic monohydric alcohols such as benzyl oleate and benzyl laurate and aliphatic monocarboxylic acids; (4) complete ester compounds of aromatic polyhydric alcohols such as bisphenol A dilaurate and aliphatic monocarboxylic acids; (5) complete ester compounds of aliphatic monohydric alcohols such as bis(2-ethylhexyl) phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polycarboxylic acids; and the like.

[0025] These other ester compounds may be used alone or in combination of two or more. As a lubricant, in addition to the above-mentioned ester compounds, mineral oil (with a kinematic viscosity of 5 mm at 40° C.) can be used. 2 / s or more) etc. As mineral oil, for example, aromatic hydrocarbons, paraffin hydrocarbons, cycloparaffin hydrocarbons etc. can be cited. More specifically, for example, spindle oil, liquid paraffin etc. can be cited. These mineral oils can be appropriately commercially available.

[0026] These mineral oils may be used alone or in combination of two or more. In the treatment agent, the lower limit of the content ratio of the smoothing agent is preferably 20% by mass or more, more preferably 30% by mass or more, and can also be 35% by mass or more, 40% by mass or more, 45% by mass or more, 52% by mass or more, 53% by mass or more, 60% by mass or more, or 65% by mass or more. The upper limit of the content ratio of the smoothing agent is preferably 80% by mass or less, more preferably 75% by mass or less, and can also be 70% by mass or less, 65% by mass or less, 60% by mass or less, 53% by mass or less, 52% by mass or less, 45% by mass or less, 40% by mass or less, or 35% by mass or less. By being defined as the range of the content ratio, it is possible to impart smoothness to the fiber and to further improve the effect of the present invention. It should be noted that it is also possible to imagine the range formed by any combination of the above upper and lower limits.

[0027] (Nonionic surfactant) The nonionic surfactant used in the treatment agent of the present embodiment includes a compound (A) obtained by esterifying a divalent or higher and a pentavalent or lower polyol having a (poly)oxyalkylene group and a fatty acid (A1) including a monovalent unsaturated fatty acid having two or more unsaturated bonds.

[0028] Specific examples of the polyhydric alcohol having a valence of at least 2 and at most 5 include 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, glycerol, diglycerol, triglycerol, 2-methyl-2-hydroxymethyl-1,3-propanediol, trimethylolpropane, pentaerythritol, sorbitan, isosorbide, etc. Among these, glycerol, sorbitan, polyethylene glycol, and isosorbide are preferred from the viewpoint of the stability of the treatment agent.

[0029] As the alkylene oxide used as the raw material for forming the (poly)oxyalkylene, the alkylene oxide having a carbon number of 2 or more and 4 or less is preferred. As specific examples of alkylene oxide, for example, ethylene oxide, propylene oxide, butylene oxide, etc. can be cited. The number of moles of alkylene oxide added can be appropriately set, preferably 0.1 mole or more and 250 moles or less, more preferably 1 mole or more and 200 moles or less, further preferably 2 moles or more and 150 moles or less, and particularly preferably 3 moles or more and 40 moles or less. It is also possible to imagine a range in which the above upper and lower limits are arbitrarily combined. It should be noted that the number of moles of alkylene oxide added represents the number of moles of alkylene oxide relative to 1 mole of the addition object compound put into the raw material. Alkylene oxide can use one alkylene oxide alone, or two or more alkylene oxides can be used in appropriate combination. In the case of applying two or more alkylene oxides, their addition mode can be any one of block addition, random addition, and a combination of block addition and random addition, without special restrictions.

[0030] Specific examples of monounsaturated fatty acids having two or more unsaturated bonds include: (1) monounsaturated fatty acids having two unsaturated bonds, such as linoleic acid, eicosadienoic acid, and docosadienoic acid; (2) monounsaturated fatty acids having three unsaturated bonds, such as α-linolenic acid, γ-linolenic acid, and eicosatrienoic acid; (3) monounsaturated fatty acids having four unsaturated bonds, such as octadecatetraenoic acid, arachidonic acid, and eicosatetraenoic acid; (4) monounsaturated fatty acids having five unsaturated bonds, such as eicosapentaenoic acid and tetracosapentaenoic acid; (5) monounsaturated fatty acids having six unsaturated bonds, such as docosahexaenoic acid; and the like. Among these, monounsaturated fatty acids having 12 or more and 22 or less carbon atoms are preferred.

[0031] The fatty acid (A1) preferably contains at least one selected from a monounsaturated fatty acid having two unsaturated bonds and a monounsaturated fatty acid having three unsaturated bonds. By using the monounsaturated fatty acid, the effect of the present invention can be further enhanced.

[0032] Compound (A) is obtained by mixing a divalent or more and a pentavalent or less polyol having a (poly)oxyalkylene group and a fatty acid (A1) at a predetermined charge ratio and esterifying under heating or the like. Alternatively, it can be obtained by reacting an ester compound of a divalent or more and a pentavalent polyol and a fatty acid (A1) with an alkylene oxide and inserting a (poly)oxyalkylene group into the ester bond. The charge ratio (molar ratio) of the divalent or more and a pentavalent polyol having a (poly)oxyalkylene group and the fatty acid (A1) in the esterification reaction can be appropriately set.

[0033] Specific examples of compound (A) include esters of mixed fatty acids (a mixture of linoleic acid and oleic acid) and polyethylene glycol, esters of linoleic acid and polyethylene glycol, esters of linoleic acid and glycerol alkylene oxide adducts, esters of linoleic acid and sorbitan alkylene oxide adducts, esters of linoleic acid and isosorbide alkylene oxide adducts, esters of linolenic acid and polyethylene glycol, and esters of linolenic acid and sorbitan alkylene oxide adducts.

[0034] These compounds (A) may be used alone or in combination of two or more. In the treatment agent, the lower limit of the content ratio of compound (A) is preferably 0.1% by mass or more, more preferably 1% by mass or more, further preferably 2% by mass or more, and may be 3% by mass or more, 5% by mass or more, 10% by mass or more, or 12% by mass or more. When the content ratio of compound (A) is 0.1% by mass or more, the rubber adhesion of the synthetic fiber to which the treatment agent is applied can be further improved. The upper limit of the content ratio of the compound (A) is preferably 20% by mass or less, more preferably 15% by mass or less, and may be 22% by mass or less, 12% by mass or less, 10% by mass or less, 5% by mass or less, or 3% by mass or less. When the content ratio of compound (A) is 20% by mass or less, the scum generated in the yarn guide, etc., can be further reduced for the synthetic fiber to which the treatment agent is applied. It should be noted that the range formed by any combination of the above upper and lower limits can also be envisioned.

[0035] The nonionic surfactant provided in the treatment agent of the present embodiment preferably further comprises a compound (B) which is formed by esterification of a polyol having a valence of 2 or more and a valence of 5 or less and a fatty acid (B1) comprising a monounsaturated fatty acid having one unsaturated bond. By making the nonionic surfactant further comprise a compound (B), it is possible to achieve both an improvement in the rubber adhesion of the synthetic fiber to which the treatment agent is applied and an effect of reducing scum.

[0036] Specific examples of the divalent or higher and pentavalent polyol having a (poly)oxyalkylene group are the same as those described above as the raw material of compound (A). Preferred polyols are also the same as those of compound (A).

[0037] Specific examples of the alkylene oxide used as a raw material for forming the (poly)oxyalkylene group are the same as the specific examples of the alkylene oxide explained as the raw material of the above-mentioned compound (A).

[0038] As a specific example of a monounsaturated fatty acid having one unsaturated bond, for example, crotonic acid, myristic acid, palmitoleic acid, oleic acid, vaccenic acid, eicosenoic acid, erucic acid, etc. can be cited. Among these, monounsaturated fatty acids having a carbon number of 12 or more and 22 or less are preferred. It should be noted that the fatty acid (B1) does not include a monounsaturated fatty acid having two or more unsaturated bonds.

[0039] Compound (B) is obtained by mixing a divalent or higher and a pentavalent or lower polyol having a (poly)oxyalkylene group with a fatty acid (B1) at a predetermined charge ratio and esterifying under heating or the like. Alternatively, it can be obtained by reacting an ester compound of a divalent or higher and a pentavalent polyol and a fatty acid (B1) with an alkylene oxide and inserting a (poly)oxyalkylene group into the ester bond. The charge ratio (molar ratio) of the divalent or higher and a pentavalent polyol having a (poly)oxyalkylene group and the fatty acid (B1) in the esterification reaction can be appropriately set.

[0040] Specific examples of the compound (B) include esters of oleic acid and polyethylene glycol, esters of oleic acid and an alkylene oxide adduct of sorbitan, esters of palmitoleic acid and polyethylene glycol, and esters of erucic acid and polyethylene glycol.

[0041] These compounds (B) may be used alone or in combination of two or more. In the treatment agent, the lower limit of the proportion of compound (B) is preferably 3% by mass or more, more preferably 5% by mass or more, and can also be 8% by mass or more, 12% by mass or more, 15% by mass or more, 16% by mass or more, or 20% by mass or more. The upper limit of the proportion of compound (B) is preferably 40% by mass or less, more preferably 35% by mass or less, and can also be 34% by mass or less, 20% by mass or less, 16% by mass or less, 15% by mass or less, 12% by mass or less, or 8% by mass or less. By being defined as the scope of the proportion, the effect of the present invention can be obtained, particularly the improvement of the rubber adhesion of the synthetic fiber to which the treatment agent is given and the reduction effect of the scum can be taken into account. It should be noted that the scope of any combination of the above upper and lower limits can also be envisioned.

[0042] In the treatment agent, the mass ratio of the above-mentioned compound (A) to the compound (B) is preferably compound (A) / compound (B) = 50 / 50 to 5 / 95, and more preferably 40 / 60 to 5 / 95. By setting it to this range, the effects of the present invention can be obtained, especially the improvement of the rubber adhesion of the synthetic fiber to which the treatment agent is applied and the reduction of scum can be taken into account. In addition, the mass ratio of the compound (A) to the compound (B) can be 9 / 91 or more, 13 / 87 or more, 17 / 83 or more, 25 / 75 or more, 29 / 71 or more, 33 / 67 or more, 38 / 62 or more, or 39 / 61 or more, or 50 / 50 or less, 39 / 61 or less, 38 / 62 or less, 33 / 67 or less, 29 / 71 or less, 25 / 75 or less, 17 / 83 or less, or 13 / 87 or less.

[0043] In the treatment agent, the total content of the compound (A) and the compound (B) is preferably 10% by mass or more and 40% by mass or less. By setting it to this range, the effects of the present invention can be obtained, especially the improvement of the rubber adhesion of the synthetic fiber given the treatment agent and the reduction of scum can be taken into account.

[0044] The nonionic surfactant used in the treatment agent of the present embodiment may further include a compound (C) obtained by esterifying a divalent to pentavalent polyol having a (poly)oxyalkylene group and a fatty acid (C1) including a monovalent saturated fatty acid.

[0045] Specific examples of the divalent or higher and pentavalent polyol having a (poly)oxyalkylene group are the same as those described above as the raw material of compound (A). Preferred polyols are also the same as those of compound (A).

[0046] Specific examples of the alkylene oxide used as a raw material for forming the (poly)oxyalkylene group are the same as the specific examples of the alkylene oxide explained as the raw material of the above-mentioned compound (A).

[0047] As the specific example of monobasic saturated fatty acid, for example, formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid (caprylic acid), caprylic acid (2-ethylhexanoic acid), octanoic acid (caprylic acid), nonanoic acid, capric acid (caprylic acid), dodecanoic acid (lauric acid), tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), eicosanoic acid (arachidic acid), behenic acid (behenic acid), tetracosanoic acid etc. can be enumerated. Among these, preferably the monobasic saturated fatty acid with more than 12 and less than 22 carbon atoms. It should be noted that monobasic unsaturated fatty acids are not included in fatty acid (C1).

[0048] Compound (C) is obtained by mixing a divalent or higher and a pentavalent or lower polyol having a (poly)oxyalkylene group with a fatty acid (C1) at a predetermined charge ratio and esterifying under heating or the like. Alternatively, it can be obtained by reacting an ester compound of a divalent or higher and a pentavalent polyol and a fatty acid (C1) with an alkylene oxide and inserting a (poly)oxyalkylene group into the ester bond. The charge ratio (molar ratio) of the divalent or higher and a pentavalent polyol having a (poly)oxyalkylene group and the fatty acid (C1) in the esterification reaction can be appropriately set.

[0049] Specific examples of the compound (C) include esters of mixed fatty acids (a mixture of palmitic acid and stearic acid) and polyethylene glycol, and esters of mixed fatty acids (a mixture of lauric acid, myristic acid and palmitic acid) and polyethylene glycol.

[0050] These compounds (C) may be used alone or in combination of two or more. In the treatment agent, the lower limit of the content ratio of the compound (C) is preferably 0.1 mass % or more, more preferably 1 mass % or more, and can also be 2 mass % or more or 5 mass % or more. The upper limit of the content ratio of the compound (C) is preferably 20 mass % or less, more preferably 15 mass % or less, and can also be 14 mass % or less or 5 mass % or less. By defining the content ratio of the compound (C) in the range, the effect of the present invention can be further improved. It should be noted that the scope formed by any combination of the above upper and lower limits can also be envisioned.

[0051] In addition, in the treatment agent, when the total content ratio of the above-mentioned compound (A), the above-mentioned compound (B) and the above-mentioned compound (C) is set to 100 mass%, the above-mentioned compound (A) and the above-mentioned compound (B) are contained in a total ratio of preferably 50 mass% or more, more preferably 70 mass% or more. By setting it to this range, it is possible to take into account both the improvement of the rubber adhesion of the synthetic fiber to which the treatment agent is given and the reduction effect of scum. When the total content of compound (A), compound (B) and compound (C) is set to 100 mass%, the total content of compound (A) and compound (B) can be 65 mass% or more, 81 mass% or more, 82 mass% or more, 86 mass% or more, or 90 mass% or more.

[0052] The treatment agent of the present embodiment may further contain other nonionic surfactants other than the above-mentioned compounds (A) to (C). Examples of other nonionic surfactants 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 polyols, compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to amine compounds such as organic primary amines, partial ester compounds of carboxylic acids and polyols, amide compounds obtained by condensing amine compounds with carboxylic acids, and compounds having a (poly)oxyalkylene structure obtained by adding alkylene oxide to fatty amides.

[0053] Specific examples of alcohols used as raw materials for nonionic surfactants include: (1) straight-chain 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, heptacosanol, octacosanol, nonacosanol, and triacontanol; (2) isopropyl alcohol, isobutyl alcohol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isododecanol, isotridecanol, isotetradecanol, isopentadecanol, isopentadecanol, and isotricontanol. (i) branched alkyl alcohols such as hexadecanol, isoheptadecanol, isooctadecanol, isonadecanol, isoeicosanol, isoheneicosanol, isodocosanol, isotricosanol, isotetracosanol, isopentacosanol, isohexacosanol, isohexacosanol, isohexacosanol, isoctacosanol, isonoctacosanol and isotriacontanol; (2) straight-chain alkenyl alcohols such as tetradecenol, hexadecanol, heptadecanol, octadecenol and nonadecanol; (3) branched alkenyl alcohols such as isohexadecanol and isooctadecanol; (4) branched alkenyl alcohols such as isohexadecanol and isooctadecanol; (5) cyclic alkyl alcohols such as cyclopentanol and cyclohexanol; (6) aromatic alcohols such as phenol, nonylphenol, benzyl alcohol, monostyrenated phenol, distyrenated phenol and tristyrenated phenol; etc.

[0054] Specific examples of carboxylic acids used as raw materials for nonionic surfactants include: (1) straight-chain alkyl carboxylic acids such as octanoic 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-chain alkyl carboxylic acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, and isooctadecanoic acid; (3) straight-chain 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; (6) polycarboxylic acids such as adipic acid, sebacic acid, and tricarballylic acid; and the like.

[0055] Specific examples of the alkylene oxide used as a raw material for forming the (poly)oxyalkylene structure of the nonionic surfactant are the same as the specific examples of the alkylene oxide explained as the raw material of the compound (A) above.

[0056] Specific examples of the polyol used as a raw material of the nonionic surfactant include, in addition to the polyols described as the raw material of the compound (A), sucrose, sorbitol, polyglycerol, and the like.

[0057] Specific examples of the amine compound used as a raw material of the nonionic surfactant include methylamine, ethylamine, butylamine, octylamine, laurylamine, octadecylamine (stearylamine), octadecenylamine, coconut amine, vinylamine, and the like.

[0058] Specific examples of fatty amides used as raw materials for nonionic surfactants include caprylic amide, lauryl amide, palmitamide, stearic amide, oleyl amide, behenyl amide, lignoceramide, amides of fatty acids and diethanolamine, and amides of fatty acids and vinylamine.

[0059] Specific examples of the nonionic surfactant include alkylene oxide adducts of monohydric alcohols, alkylene oxide adducts of castor oil and its derivatives, esters of alkylene oxide adducts of castor oil and its derivatives with fatty acids, partial esters of polyhydric alcohols having 3 to 6 carbon atoms and carboxylic acids, alkylene oxide adducts of fatty acid amides, and alkylene oxides of primary alkyl amines. More specifically, there can be mentioned substances obtained by adding alkylene oxide to isododecanol, substances obtained by adding alkylene oxide to oleyl alcohol, substances obtained by adding alkylene oxide to isotetradecanol, substances obtained by adding alkylene oxide to hydrogenated castor oil, compounds obtained by esterifying substances obtained by adding alkylene oxide to hydrogenated castor oil with oleic acid, compounds obtained by cross-linking substances obtained by adding alkylene oxide to hydrogenated castor oil with adipic acid and further esterifying with stearic acid, glycerol dioleate, a diester of trimethylolpropane and isostearic acid, a compound obtained by esterifying sorbitol with mixed fatty acids (palmitic acid, oleic acid and linoleic acid), alkylene oxide adducts of oleyl diethanolamide, alkylene oxide adducts of laurylamine, alkylene oxide adducts of stearylamine, and the like.

[0060] These other nonionic surfactants may be used alone or in appropriate combination of two or more. In the treatment agent, the lower limit of the proportion of all nonionic surfactants is preferably 20 mass %, more preferably 25 mass %, or more, and can be 33 mass %, 35 mass %, 37 mass %, 43 mass %, 44 mass %, 45 mass %, 46 mass %, 53 mass %, 56 mass %, 62 mass %, or 66 mass %. The upper limit of the proportion of the nonionic surfactant is preferably 75 mass %, more preferably 70 mass %, or 67 mass %, 66 mass %, 62 mass %, 56 mass %, 53 mass %, 46 mass %, 45 mass %, 44 mass %, 43 mass %, 37 mass %, 35 mass %, or 33 mass %. By being defined as the scope of the proportion, the effect of the present invention can be further improved. It should be noted that the scope of any combination of the above-mentioned upper and lower limits can also be envisioned.

[0061] (Ionic surfactant) The treatment agent of the present embodiment may further contain an ionic surfactant. Examples of the ionic surfactant include anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0062] As the anionic surfactant, known substances can be appropriately used. Specific examples of the anionic surfactant include: (1) phosphate esters of fatty alcohols such as lauryl phosphate, cetyl phosphate, isocetyl phosphate, octyl phosphate, oleyl phosphate, and stearyl phosphate; (2) substances obtained by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to aliphatic alcohols such as polyoxyethylene lauryl ether phosphate, polyoxyethylene oleyl ether phosphate, and polyoxyethylene stearyl ether phosphate; Phosphate salts; (3) aliphatic sulfonates or aromatic sulfonates such as lauryl sulfonate, myristyl sulfonate, cetyl sulfonate, oleyl sulfonate, stearyl sulfonate, tetradecane sulfonate, dodecylbenzene sulfonate, secondary alkane sulfonate (carbon number 13-15), secondary alkane sulfonate (carbon number 11-14), α-olefin sulfonate; (4) sulfate esters of aliphatic alcohols such as lauryl sulfate esters, oleyl sulfate esters, stearyl sulfate esters; (5) polyols such as propylene glycol sulfonate, ... Sulfate salts of substances obtained by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to aliphatic alcohols, such as oxyethylene lauryl ether sulfate salts, polyoxyalkylene (polyoxyethylene, polyoxypropylene) lauryl ether sulfate salts, and polyoxyethylene oleyl ether sulfate salts; (6) fatty acid sulfate salts of castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, and palm oil; (7) sulfates of fats and oils such as castor oil sulfates, sesame oil sulfates, tall oil sulfates, soybean oil sulfates, rapeseed oil sulfates, and palm oil sulfates; (8) fatty acid salts such as laurate, oleate, stearate, and 2-ethylhexanoate; (9) sulfosuccinates of fatty alcohols such as di(2-ethylhexyl)sulfosuccinate; (10) N-acyl sarcosinates such as oleoyl sarcosinate; and the like.

[0063] Examples of the salt constituting the anionic surfactant include metal salts, ammonium salts, phosphonium salts, and organic amine salts. As metal salts, for example, alkali metal salts and alkaline earth metal salts can be cited. As specific examples of alkali metals constituting alkali metal salts, for example, sodium, potassium, lithium, etc. can be cited. As alkaline earth metals constituting alkaline earth metal salts, metals belonging to Group 2 elements, such as calcium, magnesium, beryllium, strontium, barium, etc. can be cited.

[0064] Specific examples of the phosphonium constituting the phosphonium salt include quaternary phosphonium such as tetramethylphosphonium, tetraethylphosphonium, tetrabutylphosphonium, tetraoctylphosphonium, dibutyldihexylphosphonium, trihexyltetradecylphosphonium, triethyloctylphosphonium, trioctylmethylphosphonium and triphenylmethylphosphonium.

[0065] The amine constituting the organic amine salt may be any of a primary amine, a secondary amine and a tertiary amine. Specific examples of the amine constituting the amine salt include: (1) aliphatic amines such as methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, NN-diisopropylethylamine, butylamine, dibutylamine, 2-methylbutylamine, tributylamine, octylamine and dimethyllaurylamine; (2) aromatic amines or heterocyclic amines such as aniline, N-methylbenzylamine, pyridine, morpholine, piperazine and their derivatives; (3) alkanolamines such as monoethanolamine, N-methylethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, dibutylethanolamine, butyldiethanolamine, octyldiethanolamine and lauryldiethanolamine; (4) arylamines such as N-methylamine; (5) polyoxyalkylene alkylaminoethers such as polyoxyethylene laurylaminoether and polyoxyethylene stearylaminoether; and the like.

[0066] As the cationic surfactant, a known substance can be appropriately adopted. Specific examples of the cationic surfactant include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, didecyldimethylammonium chloride, and 1,2-dimethylimidazole.

[0067] As the amphoteric surfactant, a known one can be appropriately adopted. Specific examples of the amphoteric surfactant include betaine-type amphoteric surfactants. Regarding these ionic surfactants, one type of ionic surfactant may be used alone, or two or more types of ionic surfactants may be used in appropriate combination.

[0068] In the treatment agent, the lower limit of the proportion of the ionic surfactant is preferably 1% by mass or more, more preferably 2% by mass or more, and may be 3% by mass or more or 4% by mass or more. The upper limit of the proportion of the ionic surfactant is preferably 10% by mass or less, more preferably 5% by mass or less, and may be 4% by mass or less or 3% by mass or less. By specifying the range of the proportion, the effect of the present invention can be further improved. It should be noted that the range formed by any combination of the above upper and lower limits can also be envisioned.

[0069] <Second Embodiment> Next, a second embodiment of the synthetic fiber based on the present invention will be described. The treatment agent of the first embodiment is attached to the synthetic fiber of this embodiment. According to this embodiment, a treated synthetic fiber having a synthetic fiber and a treatment agent attached thereto is provided. The form of the treatment agent when the treatment agent is attached to the synthetic fiber can be a diluent diluted with a diluent solvent, such as an organic solvent solution, an aqueous liquid, etc. From the perspective of the adhesion and economy of the treatment agent to the fiber, hydrocarbons with a carbon number of 10 or more and 15 or less and / or water are preferably used in the diluent solvent. The mixing ratio of the treatment agent and the diluent solvent is preferably the mass of the treatment agent: the mass of the diluent solvent = 99:1 to 10:90. The diluent such as an aqueous liquid is attached to the synthetic fiber in, for example, a spinning or stretching process. The diluent attached to the synthetic fiber can evaporate the diluent solvent through a stretching process and a drying process. By using it in a manufacturing equipment or process having a process of passing a roller above 150°C in a stretching or heat treatment process, the effect of the invention can be expected to be more.

[0070] There are no particular restrictions on the specific examples of synthetic fibers to which the treatment agent of the present embodiment is applied, and examples thereof include: (1) polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polylactic acid, and composite fibers containing these polyester resins; (2) polyamide fibers such as nylon 6 and nylon 66; (3) polyacrylic acid fibers such as polyacrylic acid and modified acrylic acid; (4) polyolefin fibers such as polyethylene and polypropylene; and the like. Among these, polyester fibers and polyamide fibers are preferably used. There is no particular restriction on the fineness of the synthetic fibers to be manufactured, but it is preferably 150 dtex or more, more preferably 500 dtex or more, and further preferably 1000 dtex or more. In addition, there is no particular restriction on the strength of the synthetic fibers to be manufactured, but it is preferably 5.0 cN / dtex or more, more preferably 6.0 cN / dtex or more, and further preferably 7.0 cN / dtex or more.

[0071] The proportion of the treatment agent attached to the synthetic fiber is not particularly limited, but the treatment agent is preferably attached in a manner that the proportion relative to the synthetic fiber is 0.1% by mass or more and 5% by mass or less (excluding the proportion of solvents such as water). This configuration can further enhance the effect of the present invention. In addition, the method for attaching the treatment agent is not particularly limited, and for example, a known method such as a roller oiling method, a guide oiling method using a metering pump, an immersion oiling method, and a spray oiling method can be used.

[0072] In the present invention, the use of the synthetic fiber is not particularly limited, but synthetic fibers used for industrial materials are preferred. For example, synthetic fibers used in the fields of automobiles, construction, commerce, agriculture, aquaculture, civil engineering, etc., such as fibers for air bags, fibers for seat belts, fibers for tire cords, fibers for carpets, fibers for tents, fibers for advertising cloths, fibers for fishing nets, fibers for conveyor belts, and fibers for ropes are more preferred.

[0073] The effects of the treatment agent and the synthetic fiber according to the above-described embodiment will be described. (1) The treatment agent of the above embodiment is a mixture of the above-mentioned smoothing agent and the above-mentioned nonionic surfactant. Therefore, it is possible to achieve both the improvement of the rubber adhesion of the synthetic fiber treated with the treatment agent and the effect of reducing scum. In particular, even when the synthetic fiber treated with the treatment agent is stored for a long time, scum on the yarn guide and the like can be reduced.

[0074] Most of the fibers for industrial materials are used for rubber bonding, that is, they are used in bonding with rubber. The rubber adhesion of the fibers treated with the treatment agent tends to increase with the increase of the unsaturated bonds in the treatment agent. However, the increase of the unsaturated bonds also becomes the main cause of tar generation in the heating process. Furthermore, since the treatment agent deteriorates on the synthetic fiber during storage after spinning, scum adhesion at the yarn guide, tension fluctuations, fiber adhesion, etc. may occur, which may affect post-processing. The above-mentioned structure of the present invention can take into account the performance of spinning and post-processing.

[0075] It should be noted that the above-mentioned embodiment may be modified as follows: The above-mentioned embodiment and the following modified examples may be implemented in combination with each other within the scope of no technical contradiction. The treatment agent of the above embodiment may be further mixed with components commonly used in treatment agents, such as stabilizers, antistatic agents, linkers, ultraviolet absorbers, defoaming agents, preservatives, and rust inhibitors, during or after the production of the treatment agent in order to maintain the quality of the treatment agent, within the range not impairing the effects of the present invention.

[0076] From the perspective of improving the appearance stability of the treatment agent during storage, the treatment agent may be premixed with water. In this case, the mixing ratio of the treatment agent to water is preferably 85:15 to 99.9:0.1 (mass of treatment agent:mass of water). Example

[0077] In order to more specifically describe the composition and effect of the present invention, examples are given below, but the present invention is not limited to these examples. It should be noted that, in the following examples and comparative examples, unless otherwise stated, parts refer to parts by mass, and % refers to mass %.

[0078] Test group 1 (preparation of treatment agent) (Example 1) As shown in Table 1, a treatment agent of Example 1 was prepared, which contained: 10 parts (%) of diisocetyl thiodipropionate (ES-1) as a smoothing agent, 30 parts (%) of triester of trimethylolpropane and a mixed acid (a mixture of palm kernel fatty acid and vegetable oleic acid, mass ratio 4:6) (E-1), 20 parts (%) of rapeseed refined oil (E-2), 5 parts (%) of a compound (A-1) shown in Table 3 below as a nonionic surfactant, 8 parts (%) of a compound (B-1) shown in Table 4 below, and 10 moles of ethylene oxide (hereinafter referred to as "EO") and 10 moles of propylene oxide (hereinafter referred to as "PO") randomly added to 1 mole of isododecanol. ) (N-3) 5 parts (%), a substance obtained by adding 10 mol of EO to 1 mol of hydrogenated castor oil (N-5) 10 parts (%), a compound obtained by adding 15 mol of EO to 1 mol of hydrogenated castor oil, cross-linking with adipic acid and esterifying with stearic acid (mass average molecular weight 7000) (N-7) 5 parts (%), a substance obtained by adding 5 mol of EO to 1 mol of laurylamine (N-12) 2 parts (%), a secondary alkane sulfonic acid sodium salt (carbon number 11 to 14) (D-1) as an ionic surfactant, and a phosphate ester of 5 mol of EO addition product of oleyl alcohol-dibutylethanolamine salt (D-5) 2 parts (%).

[0079] (Examples 2 to 14, Comparative Examples 1 to 4) The treatment agents of Examples 2 to 14 and Comparative Examples 1 to 4 were prepared in the same manner as the treatment agent of Example 1 so as to contain a smoothing agent, a nonionic surfactant, and an ionic surfactant in the ratios shown in Table 1.

[0080] The type and content of the smoothing agent, the type and content of the nonionic surfactant, and the type and content of the ionic surfactant are shown in the "Smoothing Agent" column, the "Nonionic Surfactant" column, and the "Ionic Surfactant" column of Table 1, respectively. In addition, the mass ratio of compound (A) as a nonionic surfactant to compound (B) is shown in the "Mass Ratio (A) / (B)" column. In addition, when the total content ratio of compound (A), compound (B) and compound (C) as nonionic surfactants is set to 100%, the total content of compound (A) and compound (B) is shown in the "Mass Ratio [(A)+(B)] / [(A)+(B)+(C)]" column.

[0081] [Table 1]

[0082] [Table 2]

[0083] The details of the smoothing agent, nonionic surfactant, and ionic surfactant described in Table 1 are as follows. <Smoothing Agent> (Thioester compounds) ES-1: Diisocetyl thiodipropionate ES-2: Dioleyl thiodipropionate ES-3: Diisostearyl thiodipropionate (Complete ester compound of polyol and monobasic fatty acid) E-1: Trimethylolpropane and mixed acid (palm kernel fatty acid and vegetable oleic acid, mass ratio 4:6 mixture) E-2: Rapeseed refined oil E-3: Trisester of glycerol and mixed acid (palm kernel fatty acid and vegetable oleic acid, mass ratio 4:6 mixture) (Other lubricants) E-4: Diisostearyl adipate E-5: Oleyl Palmitate <Nonionic surfactant> (Compound (A)) As a compound (A) formed by esterification of a polyol having a valence of more than 2 and less than 5 and a (poly)oxyalkylene group and a fatty acid (A1) containing a monounsaturated fatty acid having more than 2 unsaturated bonds, compounds (A-1) to (A-7) shown in Table 3 below were used. In addition, as compounds similar to compound (A), compounds (rA-1) and (rA-2) shown in Table 3 were used. The types of fatty acids (A1) and polyols used as raw materials for compound (A), and the feed ratio (molar ratio) of fatty acids (A1) to polyols are shown in the "monounsaturated fatty acid (A1)" column, "polyol" column, and "reaction ratio" column of Table 3, respectively. It should be noted that a qualitative analysis of compound (A-1) by liquid chromatography showed that it did not contain a compound equivalent to compound (B). PEG400 in the "polyol" column represents polyethylene glycol with a mass average molecular weight of 400, and PEG600 represents polyethylene glycol with a mass average molecular weight of 600.

[0084] [Table 3]

[0085] (Compound (B)) As the compound (B) obtained by esterifying a divalent or higher and a pentavalent polyol having a (poly)oxyalkylene group with a fatty acid (B1) containing a monovalent unsaturated fatty acid having one unsaturated bond, the compounds (B-1) to (B-7) shown in Table 4 below were used. In addition, the types of fatty acid (B1) and polyol used as raw materials for compound (B), and the charging ratio (molar ratio) of fatty acid (B1) to polyol are shown in the "monovalent unsaturated fatty acid (B1)" column, the "polyol" column, and the "reaction ratio" column of Table 4, respectively. PEG400 in the "polyol" column represents polyethylene glycol with a mass average molecular weight of 400, PEG600 represents polyethylene glycol with a mass average molecular weight of 600, and PEG1000 represents polyethylene glycol with a mass average molecular weight of 1000.

[0086] [Table 4]

[0087] (Compound (C)) As the compound (C) obtained by esterifying a divalent or higher and a pentavalent polyol having a (poly)oxyalkylene group with a fatty acid (C1) containing a monovalent saturated fatty acid, the compound (C-1) and the compound (C-2) shown in the following Table 5 were used. In addition, the types of fatty acid (C1) and polyol used as raw materials for compound (C), and the charging ratio (molar ratio) of fatty acid (C1) to polyol are shown in the "monovalent saturated fatty acid (C1)" column, the "polyol" column, and the "reaction ratio" column of Table 5, respectively. PEG400 in the "polyol" column represents polyethylene glycol with a mass average molecular weight of 400, and PEG600 represents polyethylene glycol with a mass average molecular weight of 600.

[0088] [Table 5]

[0089] (Other nonionic surfactants) N-1: A substance obtained by adding 10 moles of EO to 1 mole of isododecanol N-2: A substance obtained by adding 10 moles of EO to 1 mole of oleyl alcohol N-3: A product obtained by randomly adding 10 moles of EO and 10 moles of PO to 1 mole of isododecanol N-4: A product obtained by adding 15 mol of EO to a product obtained by adding 15 mol of PO to 1 mol of isotetradecanol N-5: 10 mol of EO added to 1 mol of hydrogenated castor oil N-6: A compound obtained by esterifying 1 mol of hydrogenated castor oil with 15 mol of EO and esterifying it with 3 mol of oleic acid N-7: A compound prepared by adding 15 mol of EO to 1 mol of hydrogenated castor oil, crosslinking with adipic acid, and esterifying with stearic acid (mass average molecular weight 7000) N-8: Glyceryl dioleate N-9: Diester of trimethylolpropane and isostearic acid N-10: A compound obtained by esterifying sorbitol with a mixed fatty acid (palmitic acid, oleic acid, and linoleic acid in a mass ratio of 7 / 75 / 18) (reaction molar ratio 1:1) N-11: 8 moles of EO added to 1 mole of oleyl diethanolamide N-12: 5 moles of EO added to 1 mole of lauryl amine N-13: 10 moles of EO added to 1 mole of stearylamine <Ionic surfactants> D-1: Sodium salt of secondary alkane sulfonate (carbon number 11 to 14) D-2: Di(2-ethylhexyl)sulfosuccinate sodium salt D-3: α-olefin sulfonic acid sodium salt D-4: Potassium 2-ethylhexanoate D-5: Phosphate ester of 5 mole EO adduct of oleyl alcohol-dibutylethanolamine salt D-6: Isocetyl phosphate-stearylamine 10 mole EO adduct salt In addition, the measurement of mass average molecular weight was performed by gel permeation chromatography using polystyrene as a standard substance.

[0090] Test Group 2 (Bonding) Each treatment agent prepared as described above was uniformly diluted with an organic solvent (mixed solvent of hexane and ethanol) as a diluent to prepare a 15% dilution. In the spinning process, the dilution was applied to 1670 dtex, 288 filaments, and an oil-free polyethylene terephthalate fiber with an intrinsic viscosity of 0.93 by an oiling roller oiling method in an amount of 5.0% based on non-volatile components. The dilution solvent was then dried to obtain a test yarn.

[0091] Two test yarns were twisted with a twist number of 40 times / 10cm for the lower twist and 40 times / 10cm for the upper twist to prepare a twisted cord. The twisted cord was immersed in the first adhesive (epoxy compound (Nagase chemteX, trade name Denacol EX-512) / blocked isocyanate (Daiichi Kogyo Seiyaku, trade name Erastron BN-27) = 5 / 5 (solid content ratio)), and then heat-treated. Then, it was further immersed in the second adhesive (RFL solution of resorcinol (Kishida Chemical, trade name Resorcinol) / formaldehyde (Kishida Chemical, trade name Formaldehyde solution (37%)) / latex (Nipol 2518FS, Nippon Zeon, trade name Nipol) = 1.5 / 0.5 / 8 (solid content ratio)), and then heat-treated to obtain a reinforcing cord treated with an adhesive. The reinforcing cords were arranged without gaps on an unvulcanized rubber of 2.5 cm in length and 12.5 cm in width, and an unvulcanized rubber was further placed on the unvulcanized rubber, and the unvulcanized rubber was press-vulcanized at 150°C and 4 MPa for 30 minutes to prepare a test piece for rubber adhesion evaluation. For the test piece after natural cooling, the reinforcing cords were peeled off from the rubber at a peeling speed of 50 mm / min, and the adhesion of the rubber to the reinforcing cords was visually observed and evaluated according to the following evaluation criteria. The results are shown in the "Adhesion" column of Table 2.

[0092] ·Evaluation criteria for bonding ○○ (good): Rubber adheres to such an extent that no reinforcing cord is observed ○ (Pass): The rubber is attached to the extent that the reinforcing cord is slightly visible × (Unqualified): The reinforcing cord is clearly observed Test Group 3 (Scum) After the test yarn obtained in test group 2 was stored at 60°C for 6 weeks, it was brought into contact with a ceramic yarn guide for 5 minutes under the conditions of an initial tension of 0.5 kg and a yarn speed of 50 m / min. The amount of scum attached to the ceramic yarn guide was visually observed and evaluated according to the following evaluation criteria. The results are shown in the "Scum" column of Table 2.

[0093] Evaluation criteria for scum ○○ (good): No scum was observed ○ (Pass): Scum is slightly observed × (Unqualified): Scum is clearly observed The results in Table 2 also show that the treatment agents of each example were evaluated as above acceptable for adhesion and scum. According to the present invention, both the improvement of rubber adhesion and the reduction of scum of synthetic fibers to which the treatment agent for synthetic fibers is applied can be achieved.

[0094] The present disclosure also includes the following aspects. (Note 1) A synthetic fiber treatment agent, comprising a smoothing agent and a nonionic surfactant, characterized in that: The smoothing agent comprises a complete ester compound of a polyol having a chain structure and having 3 to 6 carbon atoms and a monovalent fatty acid having 8 to 24 carbon atoms. The nonionic surfactant comprises a compound (A) and a compound (B), wherein the compound (A) is obtained by esterifying a divalent to 5valent polyol having a (poly)oxyalkylene group and a fatty acid (A1) containing at least one selected from a monovalent unsaturated fatty acid having 12 to 22 carbon atoms and having two unsaturated bonds and a monovalent unsaturated fatty acid having 12 to 22 carbon atoms and having three unsaturated bonds, and the compound (B) is obtained by esterifying a divalent to 5valent polyol having a (poly)oxyalkylene group and a fatty acid (B1) containing a monovalent unsaturated fatty acid having one unsaturated bond. The synthetic fiber processing agent contains 30% by mass or more and 70% by mass or less of the complete ester compound and 0.1% by mass or more and 22% by mass or less of the compound (A).

[0095] (Note 2) A synthetic fiber treatment agent, comprising a smoothing agent and a nonionic surfactant, characterized in that: The smoothing agent comprises a complete ester compound of a polyol having a chain structure and having 3 to 6 carbon atoms and a monovalent fatty acid having 8 to 24 carbon atoms, and a sulfur-containing ester compound. The nonionic surfactant comprises a compound (A) obtained by esterifying a divalent or higher and a pentavalent or lower polyol having a (poly)oxyalkylene group and a fatty acid (A1) comprising at least one selected from a monovalent unsaturated fatty acid having 12 to 22 carbon atoms and having two unsaturated bonds and a monovalent unsaturated fatty acid having 12 to 22 carbon atoms and having three unsaturated bonds, The synthetic fiber processing agent contains 30% by mass or more and 70% by mass or less of the complete ester compound and 0.1% by mass or more and 22% by mass or less of the compound (A).

[0096] (Note 3) The synthetic fiber processing agent according to Supplement 1, wherein the mass ratio of the compound (A) to the compound (B) is compound (A) / compound (B)=40 / 60 to 5 / 95.

[0097] (Note 4) The synthetic fiber processing agent according to Supplementary Note 1, wherein The nonionic surfactant further comprises a compound (C) obtained by esterifying a polyol having a valence of 2 or more and 5 or less and having a (poly)oxyalkylene group with a fatty acid (C1) comprising a monovalent saturated fatty acid, When the total content of the compound (A), the compound (B) and the compound (C) is 100 mass %, the compound (A) and the compound (B) are contained in a total of 70 mass % or more.

[0098] (Note 5) The synthetic fiber processing agent according to Supplementary Note 1, wherein the smoothing agent further contains a sulfur-containing ester compound. (Note 6) The synthetic fiber processing agent according to Supplementary Note 1, further comprising an ionic surfactant.

[0099] (Note 7) A synthetic fiber characterized in that the synthetic fiber treatment agent according to any one of Supplementary Notes 1 to 6 is adhered thereto.

Claims

1. A treatment agent for synthetic fibers, characterized in that: Contains lubricant and non-ionic surfactant. The smoothing agent comprises a complete ester compound of a polyol and a monobasic fatty acid, The nonionic surfactant includes a compound (A) obtained by esterifying a divalent or higher and pentavalent polyol having a (poly)oxyalkylene group and a fatty acid (A1) including a monovalent unsaturated fatty acid having two or more unsaturated bonds.

2. The synthetic fiber treating agent according to claim 1, wherein The fatty acid (A1) includes at least one selected from a monounsaturated fatty acid having two unsaturated bonds and a monounsaturated fatty acid having three unsaturated bonds.

3. The synthetic fiber treating agent according to claim 1, wherein The synthetic fiber processing agent contains the compound (A) in a ratio of 0.1 mass % to 20 mass %.

4. The synthetic fiber processing agent according to claim 1, wherein The nonionic surfactant further includes a compound (B) obtained by esterifying a divalent or higher and a pentavalent or lower polyol having a (poly)oxyalkylene group and a fatty acid (B1) including a monovalent unsaturated fatty acid having one unsaturated bond.

5. The synthetic fiber treating agent according to claim 4, wherein In the synthetic fiber treating agent, the mass ratio of the compound (A) to the compound (B) is compound (A) / compound (B)=40 / 60 to 5 / 95.

6. The synthetic fiber treating agent according to claim 4, wherein The nonionic surfactant further comprises a compound (C) which is obtained by esterifying a polyol having a valence of 2 or more and 5 or less and having a (poly)oxyalkylene group and a fatty acid (C1) comprising a monovalent saturated fatty acid. When the total content of the compound (A), the compound (B) and the compound (C) is 100 mass %, the compound (A) and the compound (B) are contained in a total of 70 mass % or more.

7. The synthetic fiber treating agent according to claim 1, wherein The smoothing agent further comprises a sulfur-containing ester compound.

8. The synthetic fiber processing agent according to claim 1, further comprising an ionic surfactant.

9. A synthetic fiber, characterized in that: The synthetic fiber treating agent according to any one of claims 1 to 8 is adhered thereto.

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