First treatment agent for regenerated cellulose fiber, treatment agent for regenerated cellulose fiber, composition containing first treatment agent for regenerated cellulose fiber, method for preparing dilution of treatment agent for regenerated cellulose fiber, method for treating regenerated cellulose fiber, and regenerated cellulose fiber

Abstract

The present invention aims to provide a first treatment agent for regenerated cellulose fibers having improved formulation stability. The first treatment agent for regenerated cellulose fibers of the present invention contains an iodine value of 1 gI 2 The first treatment agent for regenerated cellulose fibers is characterized in that it contains a sulfate ester salt (A) and an iodine value of less than 1 g / 100 g. 2 / 100g of nonionic surfactant (B1). The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

Description

Technical Field

[0001] The present invention relates to a first treatment agent for regenerated cellulose fibers, a treatment agent for regenerated cellulose fibers, a composition containing the first treatment agent for regenerated cellulose fibers, a method for preparing a dilution liquid of the treatment agent for regenerated cellulose fibers, a method for treating regenerated cellulose fibers, and regenerated cellulose fibers. Background Art

[0002] As regenerated fibers made of pulp, cotton linters, etc., regenerated cellulose fibers such as viscose rayon are known. Regenerated cellulose fibers have excellent biodegradability, hygroscopicity and water absorption, and have attracted attention as cotton substitute fibers from these aspects. Generally, regenerated cellulose fibers are obtained by wet spinning after preparing a raw material solution, and then undergoing a weaving process. For example, before the weaving process, a treatment agent for regenerated cellulose fibers is sometimes applied to improve the process passability.

[0003] Conventionally, there is known a treatment agent for viscose rayon as disclosed in Patent Document 1. Patent Document 1 discloses a treatment agent for viscose rayon containing a sulfate ester of fats and oils such as castor oil, an amine salt thereof, or an alkali metal salt thereof as a smoothing agent component.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 5630932 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, there is a demand for further improvement in the formulation stability of the regenerated cellulose fiber treating agent.

[0009] Means for solving problems

[0010] The present inventors have conducted research to solve the above problems and found that

[0011] The first treatment agent for regenerated cellulose fibers containing a surfactant is suitable.

[0012] In order to solve the above-mentioned problems, one embodiment of the present invention is a first treatment agent for regenerated cellulose fibers having an iodine value of 1 gI 2 The first treatment agent for regenerated cellulose fibers used in combination with the second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 1 g / 100 g is characterized in that it contains a sulfate ester salt (A) and an iodine value of less than 1 g / 100 g. 2 / 100g of nonionic surfactant (B1). The sulfuric acid ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0013] In the first treatment agent for regenerated cellulose fibers, the nonionic surfactant (B1) may include a compound in which an alkylene oxide having 2 to 3 carbon atoms is added in a total ratio of 1 mol to 20 mol relative to 1 mol of an aliphatic alcohol having 8 to 24 carbon atoms or a fatty acid having 8 to 24 carbon atoms.

[0014] In the first treatment agent for regenerated cellulose fibers, the oil (a) may be at least one selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow, and whale oil.

[0015] In the first treatment agent for regenerated cellulose fibers, the mass ratio of the content of the sulfate ester salt (A) to the content of the nonionic surfactant (B1) may be sulfate ester salt (A) / nonionic surfactant (B1) = 50 / 50 to 99 / 1.

[0016] The first treatment agent for regenerated cellulose fibers may further contain at least one selected from an anionic surfactant (C) and an oil (D). The anionic surfactant (C) is at least one selected from alkali metal salts of sulfuric acid esters of fatty acids having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of compounds obtained by adding alkylene oxides having 2 to 3 carbon atoms in a total ratio of 1 to 20 mol per 1 mol of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of phosphoric acid esters of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of aliphatic sulfonic acids having 8 to 24 carbon atoms, and alkali metal salts of aliphatic fatty acids having 8 to 24 carbon atoms. The oil (D) is at least one selected from hydrocarbon compounds, oils and fats, and ester compounds, all of which are liquid at 70°C.

[0017] In the above-mentioned first treatment agent for regenerated cellulose fibers, the potassium concentration detected from the non-volatile components of the second treatment agent for regenerated cellulose fibers by ICP emission spectrometry can be 5000 ppm or less, the sodium concentration can be 1000 ppm or less, the calcium concentration can be 1000 ppm or less, and the magnesium ion concentration can be 1000 ppm or less.

[0018] The first treatment agent for regenerated cellulose fibers can be applied to regenerated cellulose for short fiber use.

[0019] fiber.

[0020] In order to solve the above-mentioned problems, another aspect of the present invention is a treatment agent for regenerated cellulose fibers, which comprises the above-mentioned first treatment agent for regenerated cellulose fibers and a cellulose fiber having an iodine value of 1 gI. 2 A set of a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) in an amount of 1:1 to 100 g or more.

[0021] In order to solve the above problems, another aspect of the present invention provides a composition containing a first treatment agent for regenerated cellulose fibers, comprising the first treatment agent for regenerated cellulose fibers and a solvent (S) having a boiling point of 105° C. or less at atmospheric pressure.

[0022] In the composition containing the first treating agent for regenerated cellulose fibers, the solvent (S) may be water.

[0023] In the composition containing the first treatment agent for regenerated cellulose fibers, the content of the solvent (S) may be 10% by mass or more and 50% by mass or less relative to the total mass of the composition containing the first treatment agent for regenerated cellulose fibers.

[0024] In order to solve the above-mentioned problems, the main point of the method for preparing a diluted solution of the treatment agent for regenerated cellulose fibers in another embodiment of the present invention is to add the above-mentioned first treatment agent for regenerated cellulose fibers or the above-mentioned composition containing the first treatment agent for regenerated cellulose fibers and a dilution agent containing an iodine value of 1 gI to water. 2 The second treatment agent for regenerated cellulose fibers contains a nonionic surfactant (B2) in an amount of 1:1 to 1:1 and a nonvolatile matter concentration in the obtained diluted solution is 0.01% by mass or more and 20% by mass or less.

[0025] In the method for preparing the diluted solution of the regenerated cellulose fiber treating agent, the mass ratio of the first regenerated cellulose fiber treating agent to the second regenerated cellulose fiber treating agent may be: first regenerated cellulose fiber treating agent / second regenerated cellulose fiber treating agent=40 / 60 to 90 / 10.

[0026] The method for preparing the dilution of the regenerated cellulose fiber-treating agent may include steps 1 and 2. Step 1 is a step of adding the first treatment agent for regenerated cellulose fibers or a composition containing the first treatment agent for regenerated cellulose fibers and the second treatment agent for regenerated cellulose fibers to first water to prepare a dilution of the regenerated cellulose fiber-treating agent having a nonvolatile content concentration of greater than 2% by mass and less than 20% by mass. Step 2 is a step of further adding the dilution of the regenerated cellulose fiber-treating agent prepared in step 1 to second water to prepare a dilution of the regenerated cellulose fiber-treating agent having a nonvolatile content concentration of greater than 0.01% by mass and less than 2% by mass.

[0027] In order to solve the above-mentioned problems, the gist of the method for treating regenerated cellulose fibers in another embodiment of the present invention is to add the first treating agent for regenerated cellulose fibers or a treating agent containing the regenerated fibers to water.

[0028] A composition of a first treatment agent for raw fiber, and a composition containing an iodine value of 1 gI 2 / 100g or more of the nonionic surfactant (B2) in a second treatment agent for regenerated cellulose fibers, and a diluted solution of the obtained treatment agent for regenerated cellulose fibers is applied to the regenerated cellulose fibers.

[0029] In the above-mentioned method for treating regenerated cellulose fibers, the mass ratio of the above-mentioned first treating agent for regenerated cellulose fibers to the above-mentioned second treating agent for regenerated cellulose fibers may be: first treating agent for regenerated cellulose fibers / second treating agent for regenerated cellulose fibers=40 / 60 to 90 / 10.

[0030] In order to solve the above-mentioned problems, another aspect of the present invention is characterized in that the regenerated cellulose fiber is attached with the above-mentioned first treatment agent for regenerated cellulose fiber and a cellulose fiber having an iodine value of 1 gI 2 A second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) in an amount of at least 1:1 / 100 g.

[0031] Effects of the Invention

[0032] According to the present invention, the formulation stability of the regenerated cellulose fiber treating agent can be improved. DETAILED DESCRIPTION

[0033] <First Embodiment>

[0034] The first embodiment of the present invention which specifically implements the first treatment agent for regenerated cellulose fibers (hereinafter also referred to as the first treatment agent) is described below. The first treatment agent of this embodiment contains a predetermined sulfate ester salt (A) and an iodine value of less than 1 g. 2 / 100g of nonionic surfactant (B1).

[0035] (Sulfate ester salt (A))

[0036] The sulfate ester salt (A) used in the first treatment agent of the present embodiment is a neutralized salt of a reaction product of fats and oils (a) and sulfuric acid and at least one selected from amines, alkali metals, and alkaline earth metals.

[0037] Specific examples of the oil (a) include castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow, whale oil, etc. Among these, at least one selected from castor oil, sesame oil, tall oil, palm oil, lard and beef tallow is preferred from the viewpoint of excellent functionality of the regenerated cellulose fiber treatment agent when used.

[0038] Specific examples of alkali metals constituting the neutralization salt include sodium, potassium, lithium, etc. Examples of alkaline earth metals constituting the neutralization salt include metals belonging to Group 2 elements, such as calcium, magnesium, beryllium, strontium, barium, etc.

[0039] The amine constituting the neutralized salt may be any of a primary amine, a secondary amine, and a tertiary amine. Specific examples of the amine 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 derivatives thereof; (3) alkanolamines such as monoethanolamine, N-methylethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, dibutylethanolamine, butyldiethanolamine, octyldiethanolamine, and lauryldiethanolamine; (4) arylamines such as N-methylbenzylamine; (5) polyoxyalkylene alkylaminoethers such as polyoxyethylene laurylaminoether and polyoxyethylene stearylaminoether; (6) ammonia; and the like.

[0040] Specific examples of the sulfate ester salt (A) include: (1) amine salts of sulfate esters of fats and oils selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow, and whale oil; (2) alkali metal salts of sulfate esters of fats and oils selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow, and whale oil; (3) alkaline earth metal salts of sulfate esters of fats and oils selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow, and whale oil. Among these, sodium salts or potassium salts of sulfate esters of fats and oils selected from castor oil, sesame oil, tall oil, palm oil, lard, beef tallow, and whale oil are preferred from the viewpoint of excellent functionality of the treatment agent for regenerated cellulose fibers when used.

[0041] These sulfate ester salts (A) may be used alone or in combination of two or more thereof.

[0042] The lower limit of the content of the sulfate ester salt (A) in the first treatment agent is preferably 20% by mass or more, more preferably 30% by mass or more. When the content is 20% by mass or more, the functionality of the treatment agent for regenerated cellulose fiber, such as smoothness, can be further improved. The upper limit of the content of the sulfate ester salt (A) is preferably 90% by mass or less, more preferably 80% by mass or less. When the content is 90% by mass or less, the formulation stability can be further improved. It should be noted that the range formed by arbitrarily combining the above upper and lower limits can also be envisioned.

[0043] (Nonionic surfactant (B1))

[0044] It is known that the iodine value of the nonionic surfactant (B1) of the first treatment agent of this embodiment is less than 1 gI 2 / 100g. It is a value expressed by converting the amount of halogen that reacts with 100g of nonionic surfactant into grams of iodine. The iodine value mainly depends on the number of double bonds present in the measured substance. When the nonionic surfactant (B1) is a mixture of multiple nonionic surfactants, it is expressed by the iodine value obtained by measuring the amount of halogen that reacts with 100g of the mixture. In addition, when multiple nonionic surfactants whose iodine values ​​have been calculated are mixed, it can be calculated based on the content ratio of each component. For example, when using an iodine value of 1gI 2 / 100g of nonionic surfactant 90 parts by mass and iodine value 0gI 2 / 100g of non

[0045] When the ionic surfactant is 10 parts by mass, the iodine value of the mixture is 0.9 gI 2 / 100g.

[0046] Nonionic surfactant (B1) as long as the iodine value is less than 1gI 2 / 100g, or when using multiple nonionic surfactants, the iodine value of the mixture is less than 1gI 2 / 100g, it can be appropriately selected from known nonionic surfactants.

[0047] Examples of the nonionic surfactant used in the nonionic surfactant (B1) include substances 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, substances having a (poly)oxyalkylene structure obtained by adding alkylene oxide to alkylamines as amine compounds, partial ester compounds of carboxylic acids and polyols having a cyclic structure having 3 to 6 carbon atoms, and the like.

[0048] 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, heptadecanol, octacosanol, nonacosanol, and triacontanol; (2) isopropyl alcohol, isobutyl alcohol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isotridecanol, isotetradecanol, isotriacontanol, isohexadecanol, (i) branched-chain alkyl alcohols such as isohexadecanol, isooctadecanol, isonadecanol, isoeicosanol, isohexadecanol, isodocosasanol, isotricosasanol, isotetracosanol, isopentacosanol, isohexadecanol, isohexadecanol, isooctacosanol, isononadecanol and isopentacosanol; (ii) straight-chain alkenyl alcohols such as tetradecanol, hexadecanol, heptadecanol, octadecenol and nonadecanol; (iii) branched-chain alkenyl alcohols such as isohexadecanol and isooctadecanol; (iv) cyclic alkyl alcohols such as cyclopentanol and cyclohexanol; (v) aromatic alcohols such as phenol, nonylphenol, benzyl alcohol, monostyrenated phenol, distyrenated phenol and tristyrenated phenol; etc.

[0049] 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 ricinoleic acid; and the like.

[0050] Regarding the alkylene oxide used as a raw material for forming the (poly)oxyalkylene structure of the nonionic surfactant

[0051] Specific examples include ethylene oxide, propylene oxide, etc. The number of moles of alkylene oxide added is appropriately set, preferably 0.1 mole or more and 60 moles or less, more preferably 1 mole or more and 40 moles or less, and further preferably 2 moles or more and 30 moles or less. It is also possible to conceive of 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 alcohols or carboxylic acids added to the raw materials. When using a variety of alkylene oxides, it can be a block adduct or a random adduct.

[0052] Specific examples of the polyol used as a raw material for the nonionic surfactant 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, 2-methyl-2-hydroxymethyl-1,3-propanediol, trimethylolpropane, sorbitan, pentaerythritol, sorbitol, and the like.

[0053] Specific examples of the alkylamine used as a raw material of the nonionic surfactant include methylamine, ethylamine, butylamine, octylamine, laurylamine, octadecylamine, octadecenylamine, coconut amine and the like.

[0054] Among these, compounds in which an alkylene oxide having 2 to 3 carbon atoms is added in a total ratio of 1 mol to 20 mol per mol of an aliphatic alcohol having 8 to 24 carbon atoms or a fatty acid having 8 to 24 carbon atoms are preferred from the viewpoint of excellent functionality of the regenerated cellulose fiber treatment agent during use and excellent formulation stability.

[0055] Specific examples of the nonionic surfactant (B1) include polyoxyethylene (2 mol: represents the number of moles of alkylene oxide added (the same applies hereinafter)) lauryl ester (iodine value: 0), polyoxyethylene (5 mol) lauryl ester (iodine value: 0), polyoxyethylene (8 mol) lauryl ester (iodine value: 0), polyoxyethylene (15 mol) lauryl ester (iodine value: 0), polyoxyethylene (2 mol) stearyl ester (iodine value: 0), polyoxyethylene (5 mol) stearyl ester (iodine value: 0), polyoxyethylene (8 mol) stearyl ester (iodine value: 0), polyoxyethylene (10 mol) stearyl ester (iodine value: 0), polyoxyethylene (5 mol) behenyl ester (iodine value: 0), polyoxyethylene (10 mol) behenyl ester (iodine value: 0), polyoxyethylene (10 mol) polyoxypropylene (5 mol) lauryl ester (iodine value: 0), and polyoxyethylene (10 mol) lauryl ether (iodine value: 0).

[0056] These nonionic surfactants (B1) can be used alone with an iodine value of less than 1 gI 2 / 100g of a nonionic surfactant, or the iodine value of the mixture is less than 1gI 2 Two or more nonionic surfactants are appropriately used in combination at a ratio of 1:1 to 1:1.

[0057] The lower limit of the content of the nonionic surfactant (B1) in the first treatment agent is preferably 1% by mass or more, more preferably 5% by mass or more.

[0058] The upper limit of the content of the nonionic surfactant (B1) is preferably 60% by mass or less, more preferably 55% by mass or less. When the content is 60% by mass or less, the stability of the formulation can be further improved. It should be noted that the range formed by arbitrarily combining the above upper and lower limits can also be envisioned.

[0059] In the first treatment agent, the mass ratio of the content of the sulfate ester salt (A) to the content of the nonionic surfactant (B1) is preferably sulfate ester salt (A) / nonionic surfactant (B1) = 50 / 50 to 99 / 1, more preferably 55 / 45 to 95 / 5. By limiting to this range, the formulation stability can be further improved. It should be noted that the range formed by arbitrarily combining the above upper and lower limits can also be envisioned.

[0060] The first treatment agent may further contain at least one selected from the following anionic surfactant (C) and the following oil (D) as a smoothing component. Even when these smoothing components are contained, the formulation stability of the first treatment agent can be maintained.

[0061] (Anionic surfactant (C))

[0062] The anionic surfactant (C) is at least one selected from the group consisting of alkali metal salts of sulfuric acid esters of fatty acids having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of compounds obtained by adding alkylene oxides having 2 to 3 carbon atoms in a total ratio of 1 mol to 20 mol per 1 mol of an aliphatic alcohol having 8 to 24 carbon atoms, alkali metal salts of phosphoric acid esters of an aliphatic alcohol having 8 to 24 carbon atoms, alkali metal salts of aliphatic sulfonic acids having 8 to 24 carbon atoms, and alkali metal salts of aliphatic fatty acids having 8 to 24 carbon atoms.

[0063] Specific examples of the alkali metal constituting the alkali metal salt include sodium, potassium, lithium and the like.

[0064] The fatty acid having 8 to 24 carbon atoms may be a sulfate ester obtained from a fatty acid derived from an animal or plant oil containing a fatty acid having 8 to 24 carbon atoms. Specific examples of the alkali metal salt of the sulfate ester of the fatty acid having 8 to 24 carbon atoms include, for example, sodium salts of sulfate ester of castor oil fatty acid, sodium salts of sulfate ester of sesame oil fatty acid, sodium salts of sulfate ester of tall oil fatty acid, sodium salts of sulfate ester of soybean oil fatty acid, sodium salts of sulfate ester of rapeseed oil fatty acid, sodium salts of sulfate ester of palm oil fatty acid, sodium salts of sulfate ester of lard fatty acid, sodium salts of sulfate ester of tallow fatty acid, sodium salts of sulfate ester of whale oil fatty acid, and the like.

[0065] Specific examples of the alkali metal salt of the sulfuric acid ester of an aliphatic alcohol having 8 to 24 carbon atoms include sodium lauryl sulfate, sodium cetyl sulfate, sodium oleyl sulfate, sodium stearyl sulfate, and the like.

[0066] Specific examples of the alkali metal salt of the sulfate ester of the compound formed by adding an alkylene oxide having 2 to 3 carbon atoms in a total ratio of 1 to 20 mol relative to 1 mol of an aliphatic alcohol having 8 to 24 carbon atoms include, for example, sodium salt of sulfate ester of polyoxyethylene (3 mol) lauryl ether, sodium salt of sulfate ester of polyoxyethylene (5 mol) lauryl ether, sodium salt of sulfate ester of polyoxyethylene (3 mol) polyoxypropylene (3 mol) lauryl ether, sodium salt of sulfate ester of polyoxyethylene (3 mol) oleyl ether, sodium salt of sulfate ester of polyoxyethylene (5 mol) oleyl ether, sodium salt of sulfate ester of polyoxyethylene (3 mol) tallow alcohol, and the like.

[0067] Specific examples of the alkali metal salt of phosphoric acid ester of an aliphatic alcohol having 8 to 24 carbon atoms include potassium salt of lauryl phosphate, potassium salt of hexadecyl phosphate, potassium salt of oleyl phosphate, potassium salt of stearyl phosphate, and the like.

[0068] Specific examples of the alkali metal salt of an aliphatic sulfonic acid having 8 to 24 carbon atoms include, for example, sodium salt of lauryl sulfonic acid, sodium salt of myristyl sulfonic acid, sodium salt of cetyl sulfonic acid, sodium salt of oleyl sulfonic acid, sodium salt of stearyl sulfonic acid, sodium salt of tetradecane sulfonic acid, sodium salt of secondary alkyl sulfonic acid (C13-15), and the like.

[0069] Specific examples of the alkali metal salts of aliphatic fatty acids having 8 to 24 carbon atoms include laurate, oleate, and stearate.

[0070] As these anionic surfactants (C), one kind may be used alone, or two or more kinds of anionic surfactants may be used in appropriate combination.

[0071] (Oil(D))

[0072] The oil (D) used in the first treatment agent of the present embodiment is at least one selected from hydrocarbon compounds, oils and fats, and ester compounds, all of which are liquid at 70°C.

[0073] Specific examples of hydrocarbons that are liquid at 70°C include mineral oils and paraffins. Specific examples of fats and oils that are liquid at 70°C include castor oil, sesame oil, tall oil, lard, and beef tallow. Specific examples of ester compounds that are liquid at 70°C include butyl stearate, octyl stearate, oleyl laurate, isotridecyl stearate, sorbitan monooleate, sorbitan trioleate, and sorbitan monostearate.

[0074] These oils (D) may be used alone or in combination of two or more thereof.

[0075] (Second treatment agent for regenerated cellulose fiber (hereinafter referred to as second treatment agent))

[0076] The first treatment agent contains iodine value of 1gI 2 The first treatment agent is used together with a second treatment agent containing a nonionic surfactant (B2) of at least 100 g / 100 g. The first treatment agent is configured as a separate agent from the second treatment agent during storage or circulation, and is used as a mixture with the second treatment agent during use. The second treatment agent is described below.

[0077] (Nonionic surfactant (B2))

[0078] The iodine value of the nonionic surfactant (B2) used in the second treatment agent of this embodiment is 1 gI 2 / 100g or more. When the nonionic surfactant (B2) is a mixture of multiple nonionic surfactants, it is represented by the iodine value obtained by measuring the amount of halogen reacted with 100g of the mixture. In addition, when multiple nonionic surfactants for which iodine values ​​have been obtained are mixed, it can be calculated based on the content ratio of each component.

[0079] Specific examples of the nonionic surfactant (B2) can be appropriately selected from those exemplified in the nonionic surfactant (B1) to be blended in the first treatment agent.

[0080] Specific examples of the nonionic surfactant (B2) include polyoxyethylene (3 mol) oleyl ester (iodine value: 61), polyoxyethylene (5 mol) oleyl ester (iodine value: 51), polyoxyethylene (10 mol) oleyl ester (iodine value: 35), polyoxyethylene (13 mol) oleyl ester (iodine value: 30), polyoxyethylene (10 mol) polyoxypropylene (5 mol) oleyl ester (iodine value: 25), polyoxyethylene (25 mol) oleyl ester (iodine value: 18), polyoxyethylene (10 mol) oleyl ether (iodine value: 36), etc.

[0081] These nonionic surfactants (B2) can be used alone with an iodine value of 1 gI 2 / 100g or more of a nonionic surfactant, or the iodine value of the mixture can be 1gI 2 Two or more nonionic surfactants are appropriately used in combination in an amount of 1:1 to 10:10 g or more.

[0082] (Inorganic ion concentration)

[0083] The inorganic ion concentration detected from the nonvolatile component of the second treatment agent by ICP emission spectrometry (inductively coupled plasma emission spectrometry) is preferably within the following range. By limiting to this numerical range, the formulation stability of the second treatment agent can be further improved.

[0084] The potassium concentration detected from the nonvolatile component of the second treatment agent is preferably 5000 ppm or less, more preferably 3000 ppm or less. The sodium concentration detected from the nonvolatile component of the second treatment agent is preferably 1000 ppm or less, more preferably 500 ppm or less. The calcium concentration detected from the nonvolatile component of the second treatment agent is preferably 1000 ppm or less, more preferably 700 ppm or less. The magnesium ion concentration detected from the nonvolatile component of the second treatment agent is preferably 1000 ppm or less, more preferably 500 ppm or less.

[0085] The concentration of each inorganic ion was determined by adding the second treatment agent to distilled water to prepare a 0.01 mass % aqueous solution, and the concentrations of potassium, sodium, calcium, and magnesium contained in the 0.01 mass % aqueous solution were determined using an ICP emission spectrometer.

[0086] In this specification, the non-volatile component refers to the residue after sufficiently removing the volatile matter by heat-treating the object at 105° C. for 2 hours, that is, an absolutely dry product.

[0087] (Composition containing a first treatment agent for regenerated cellulose fibers (hereinafter referred to as a composition containing a first treatment agent))

[0088] The first treatment agent can be mixed with a solvent to prepare a composition containing the first treatment agent, and the composition can be stored or distributed as the composition containing the first treatment agent.

[0089] The composition containing the first treatment agent contains the above-mentioned first treatment agent and the following solvent (S). The solvent (S) is a solvent having a boiling point of 105°C or less under atmospheric pressure. As the solvent (S), water and organic solvents can be mentioned. As specific examples of organic solvents, low-polarity solvents such as lower alcohols such as ethanol and propanol, and low-polarity solvents such as hexane can be mentioned. These solvents (S) can be used alone, or two or more solvents can be used in appropriate combination. Among these, from the aspect of preparing an emulsion from the mixture formed by mixing the first treatment agent and the second treatment agent, polar solvents such as water and lower alcohols are preferred, and water is more preferred for the reason of excellent handling properties.

[0090] In the composition containing the first treatment agent, the content of the solvent (S) is preferably 10% by mass or more and 50% by mass or less relative to the total mass of the composition containing the first treatment agent. By being within this range, the formulation stability of the composition containing the first treatment agent can be further improved.

[0091] The effects of the first treatment agent of the first embodiment and the composition containing the first treatment agent obtained from the first treatment agent will be described.

[0092] (1-1) The first treatment agent of the above embodiment contains a sulfate ester salt (A) and an iodine value of less than 1 g. 2 / 100g of the nonionic surfactant (B1). Therefore, the formulation stability, especially the storage stability, of the first and second treating agents constituting the treating agent for regenerated cellulose fibers can be improved. Thus, the appearance of the first and second treating agents can be improved. In addition, the functions obtained by mixing the components in the first and second treating agents can be fully exerted.

[0093] (1-2) The composition containing the first treatment agent contains the first treatment agent and a solvent (S). Since the second treatment agent is constituted as a separate reagent, the formulation stability of the composition containing the first treatment agent can be improved. In addition, since the composition containing the first treatment agent contains the solvent (S), when further diluted with a solvent during use, the miscibility can be improved.

[0094] <Second Embodiment>

[0095] Next, a second embodiment of the treatment agent for regenerated cellulose fibers (hereinafter referred to as the treatment agent) of the present invention will be described.

[0096] The first treatment agent is mixed with the second treatment agent when used to prepare a mixture as a treatment agent when used, and then diluted with a solvent as needed and applied to the regenerated cellulose fiber. The first treatment agent is configured as a separate agent from the second treatment agent before use, especially during storage or circulation. Therefore, the treatment agent before use, especially the treatment agent during storage or circulation, can be configured as a set containing the first treatment agent and the second treatment agent.

[0097] The effects of the treatment agent according to the second embodiment will be described.

[0098] (2-1) In this embodiment, the treatment agent before use, especially the treatment agent during storage or circulation, is in the form of a set including the first treatment agent and the second treatment agent. Therefore, the preparation stability of the treatment agent during storage or circulation can be improved. As a result, the functions of the components constituting the treatment agent can be fully exerted during use.

[0099] <Third Embodiment>

[0100] Next, a third embodiment of the method for preparing a diluted solution of the treatment agent for regenerated cellulose fibers (hereinafter referred to as "the method for preparing a diluted solution of the treatment agent") of the present invention will be described.

[0101] The method for preparing the diluted solution of the present embodiment includes adding the first treatment agent or the composition containing the first treatment agent and the second treatment agent to water so that the nonvolatile component concentration in the obtained diluted solution is 0.01 mass % or more and 20 mass % or less.

[0102] The method of adding the first treatment agent and the second treatment agent to water can be appropriately adopted by a known method, but preferably includes the following steps 1 and 2. This method can further improve the stability of the emulsion when the mixture of the first treatment agent and the second treatment agent is in the form of an emulsion.

[0103] Step 1 is a step of adding the first treatment agent or the composition containing the first treatment agent, and the second treatment agent to the first water to prepare a mother solution of a dilution of the treatment agent having a non-volatile component concentration greater than 2% by mass and less than 20% by mass. The order of adding the first treatment agent or the composition containing the first treatment agent and the second treatment agent to the first water is not particularly limited. The first treatment agent or the composition containing the first treatment agent can be added to the first water first, and then the second treatment agent can be added thereto, or the second treatment agent can be added to the first water first, and then the first treatment agent or the composition containing the first treatment agent can be added thereto. In addition, the first treatment agent or the composition containing the first treatment agent and the second treatment agent can be added to the first water at the same time. From the aspect of improving the stability of the emulsion, it is preferred to first add the first treatment agent or the composition containing the first treatment agent to the first water, and then add the second treatment agent thereto. In addition, the temperature of the water for dilution is not particularly limited.

[0104] Step 2 is a step of adding the diluted solution of the treatment agent for regenerated cellulose fibers prepared in step 1 to the second water to prepare a diluted solution of the treatment agent having a nonvolatile content concentration of 0.01 mass % to 2 mass %.

[0105] In the method for preparing a dilution of a treatment agent, the mass ratio of the first treatment agent to the second treatment agent is preferably first treatment agent / second treatment agent=40 / 60 to 90 / 10. By limiting to this range, the miscibility can be improved and a treatment agent with excellent homogeneity can be obtained. It should be noted that when a composition containing the first treatment agent is used as the first treatment agent, the mass of the first treatment agent before solvent dilution is indicated.

[0106] The effects of the method for preparing a diluted solution of the treatment agent according to the above-described embodiment will be described.

[0107] (3-1) The method for preparing the dilution of the treatment agent of the above-mentioned embodiment includes adding the first treatment agent or the composition containing the first treatment agent, and the second treatment agent to water so that the concentration of the non-volatile component in the obtained dilution is 0.01 mass % or more and 20 mass % or less. Therefore, in the case where the mixture of the first treatment agent or the composition containing the first treatment agent and the second treatment agent is in the form of an emulsion, the stability of the emulsion can be improved. In addition, by mixing the first treatment agent or the composition containing the first treatment agent prepared in advance with the second treatment agent in water, the dilution of the treatment agent as a fiber imparting method can be prepared, so compared with the method of starting with the reagents when using, the dilution of the treatment agent can be simply prepared.

[0108] (3-2) In addition, when the mother solution of the dilution solution of the treatment agent having a non-volatile component concentration of more than 2 mass % and less than 20 mass % is prepared by adding the first treatment agent or the composition containing the first treatment agent and the second treatment agent to water, the stability of the emulsion can be further improved. As a result, the uniform adhesion of the components to the fiber can be improved, so that the efficacy of each component can be more effectively exerted.

[0109] <Fourth Implementation Method>

[0110] Next, a fourth embodiment of the method for treating regenerated cellulose fibers (hereinafter referred to as a fiber treating method) of the present invention will be described.

[0111] The fiber treatment method of this embodiment is characterized in that the first treatment agent or the composition containing the first treatment agent and the second treatment agent are added to water, and the obtained diluted solution of the treatment agent is applied to the regenerated cellulose fiber. The method for preparing the diluted solution of the treatment agent can adopt the method for preparing the diluted solution of the treatment agent of the third embodiment.

[0112] In the mode of using the first treatment agent and the second treatment agent together, the mixing ratio of the first treatment agent and the second treatment agent can be arbitrarily changed. Therefore, even under the conditions of different manufacturing conditions such as different manufacturing equipment or different climates such as temperature and humidity, the mixing ratio can be fine-tuned and a treatment agent or diluent for always obtaining the best functionality can be easily prepared. Thus, fiber manufacturing can be carried out stably. The mass ratio of the first treatment agent and the second treatment agent is preferably the first treatment agent / the second treatment agent=40 / 60~90 / 10. By limiting to this range, the miscibility and operability can be improved. It should be noted that when using a composition containing the first treatment agent as the first treatment agent, the mass converted by the first treatment agent before solvent dilution is indicated.

[0113] The type of the regenerated cellulose fiber is not particularly limited, and examples thereof include viscose rayon fiber, rayon fiber, cuprammonium rayon, polynosic rayon, and lyocell fiber.

[0114] As the attachment method, known methods such as dipping, spraying, rolling, showering, and dripping-flowing methods can be applied. In addition, there is no particular limitation on the process for attachment, and examples thereof include a post-process of the refining process, a spinning process, and the like. It is particularly preferred to use the raw cotton for spinning in a post-process of the refining process, i.e., before the spinning process. The diluted solution of the treatment agent is preferably attached to the regenerated cellulose fiber in a ratio of 0.01 to 1% by mass based on the solid content without the solvent. By imparting the treatment agent in this ratio, excellent spinning properties can be imparted to the regenerated cellulose fiber, particularly rayon fiber.

[0115] The use of the fiber is not particularly limited, and examples thereof include short fibers, spun yarns, nonwoven fabrics, and the like. The fiber can be used for any of short fibers and long fibers, but is preferably used for short fibers. Short fibers are equivalent to fibers commonly referred to as staple fibers, and do not include long fibers commonly referred to as filaments. In addition, the length of the short fibers is not particularly limited as long as it is equivalent to the short fibers in the technical field, and is preferably less than 100 mm, for example.

[0116] The regenerated cellulose fibers to which the diluent has been applied can be dried using a known method. The drying process evaporates the solvent such as water to obtain regenerated cellulose fibers to which the components contained in the first treatment agent and the second treatment agent are attached.

[0117] The effects of the fiber processing method according to the present embodiment will be described.

[0118] (4-1) The fiber treatment method of the present embodiment is a method of applying a diluent to regenerated cellulose fibers in a post-refining process, a spinning process, etc. In particular, in the case of a diluent prepared by adding a first treatment agent or a composition containing the first treatment agent and a second treatment agent to water, a diluent having excellent emulsification stability can be obtained. Therefore, the spinning properties and the effects of each component on short fibers, spinning yarns, nonwoven fabrics, etc. can be effectively exerted.

[0119] 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.

[0120] In order to maintain the quality of each agent, composition or dilution, other solvents, stabilizers, charge control agents, thickeners, antioxidants, ultraviolet absorbers, organic acids, surfactants other than those mentioned above, and other components commonly used in treatment agents, etc. may be further mixed into the first treatment agent, the second treatment agent, the composition containing the first treatment agent, or the dilution of the treatment agent in the above-mentioned embodiment within the range not hindering the effect of the present invention.

[0121] Example

[0122] In order to more specifically explain the constitution 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 specified, parts refer to parts by mass, and % refers to mass %.

[0123] Test group 1 (preparation of the first treatment agent)

[0124] (First treatment agent (1-1))

[0125] The first treatment agent (1-1) was prepared by the following preparation method using the components shown in Table 1. As shown in Table 1, the first treatment agent (1-1) contained 70 parts (%) of sodium salt of castor oil sulfate (A-1) as sulfate ester salt (A), 5 parts (%) of polyoxyethylene (8 mol) lauryl ester (iodine value: 0) (B-3) and 5 parts (%) of polyoxyethylene (10 mol) behenyl ester (iodine value: 0) (B-10) as nonionic surfactant (B1), 15 parts (%) of sodium salt of lauryl sulfonate (C-7) as anionic surfactant (C), and 15 parts (%) of oil (D) having a kinematic viscosity of about 20 mm at 40°C. 2 / s of mineral oil (D-3) and 5 parts (%) of the first treatment agent (1-1).

[0126] (First treatment agent (1-2) to (1-18), (r1-19))

[0127] The first treatment agents (1-2) to (1-18) and (r1-19) were prepared in the same manner as the first treatment agent (1-1) by including a sulfate ester salt (A), a nonionic surfactant (B1), an anionic surfactant (C) and an oil (D) in the ratios shown in Table 1.

[0128] The type and content of sulfate (A), the type and content of nonionic surfactant (B1), the type and content of anionic surfactant (C), and the type and content of oil (D) are shown in the "Sulfate (A)" column, "Nonionic surfactant (B1)" column, "Anionic surfactant (C)" column, and "Oil (D)" column of Table 1, respectively. In addition, the mass ratio of the content of sulfate (A) to the content of nonionic surfactant (B1) is shown in the "Mass ratio (sulfate (A) / nonionic surfactant (B1))" column of Table 1.

[0129] [Table 1]

[0130]

[0131] The details of the sulfate ester salt (A), the nonionic surfactant (B1), the nonionic surfactant (B2) described later, the anionic surfactant (C), and the oil (D) described in Table 1 are as follows.

[0132] (Sulfate ester salt (A))

[0133] A-1: Sodium salt of castor oil sulfate

[0134] A-2: Potassium salt of sesame oil sulfate

[0135] A-3: Potassium salt of tall oil sulfate

[0136] A-4: Sodium salt of soybean oil sulfate

[0137] A-5: Potassium salt of rapeseed oil sulfate

[0138] A-6: Sodium salt of palm oil sulfate

[0139] A-7: Potassium salt of lard sulfate

[0140] A-8: Sodium tallow sulfate

[0141] A-9: Diethanolamine salt of sesame oil sulfate (nonionic surfactant (B1) and nonionic surfactant (B2))

[0142] B-1: Polyoxyethylene (2 mol) lauryl ester (iodine value: 0)

[0143] B-2: Polyoxyethylene (5 mol) lauryl ester (iodine value: 0)

[0144] B-3: Polyoxyethylene (8 mol) lauryl ester (iodine value: 0)

[0145] B-4: Polyoxyethylene (15 mol) lauryl ester (iodine value: 0)

[0146] B-5: Polyoxyethylene (2 mol) stearyl ester (iodine value: 0)

[0147] B-6: Polyoxyethylene (5 mol) stearyl ester (iodine value: 0)

[0148] B-7: Polyoxyethylene (8 mol) stearyl ester (iodine value: 0)

[0149] B-8: Polyoxyethylene (10 mol) stearyl ester (iodine value: 0)

[0150] B-9: Polyoxyethylene (5 mol) behenate (iodine value: 0)

[0151] B-10: Polyoxyethylene (10 mol) behenate (iodine value: 0)

[0152] B-11: Polyoxyethylene (10 mol) polyoxypropylene (5 mol) lauryl ester (iodine value: 0) B-12: Polyoxyethylene (10 mol) lauryl ether (iodine value: 0)

[0153] B-13: Polyoxyethylene (3 mol) oleyl ester (iodine value: 61)

[0154] B-14: Polyoxyethylene (5 mol) oleyl ester (iodine value: 51)

[0155] B-15: Polyoxyethylene (10 mol) oleyl ester (iodine value: 35)

[0156] B-16: Polyoxyethylene (13 mol) oleyl ester (iodine value: 30)

[0157] B-17: Polyoxyethylene (10 mol) polyoxypropylene (5 mol) oleyl ester (iodine value: 25) B-18: Polyoxyethylene (25 mol) oleyl ester (iodine value: 18)

[0158] B-19: Polyoxyethylene (10 mol) oleyl ether (iodine value: 36)

[0159] (Anionic surfactant (C))

[0160] C-1: Sodium salt of tall oil fatty acid sulfate

[0161] C-2: Sodium salt of lauryl sulfate

[0162] C-3: Sodium salt of polyoxyethylene (3 mol) oleyl ether sulfate

[0163] C-4: Sodium salt of polyoxyethylene (3 moles) lauryl ether sulfate C-5: Sodium salt of polyoxyethylene (3 moles) tallow alcohol sulfate

[0164] C-6: Potassium salt of lauryl phosphate

[0165] C-7: Sodium salt of lauryl sulfonate

[0166] C-8: Potassium oleate (Oil (D))

[0167] D-1: Kinematic viscosity at 20°C is about 10 mm 2 / s mineral oil

[0168] D-2: Kinematic viscosity at 40°C is about 10 mm 2 / s mineral oil

[0169] D-3: Kinematic viscosity at 40°C is about 20 mm 2 / s mineral oil

[0170] D-4: Kinematic viscosity at 40°C is about 90 mm 2 / s mineral oil

[0171] D-5: Butter

[0172] D-6: Sorbitan monooleate

[0173] D-7: Stearyl Stearate

[0174] D-8: Paraffin wax (melting point 55°C)

[0175] Test group 2 (preparation of a composition containing the first treatment agent)

[0176] (Composition (X1-1) containing the first treatment agent)

[0177] The composition (X1-1) containing the first treatment agent was prepared by the following preparation method using the components shown in Table 2. As shown in Table 2, the composition (X1-1) containing the first treatment agent (1-1) was prepared, which contained 80 parts (%) of the first treatment agent (1-1) and 20 parts (%) of water as a solvent (S).

[0178] (Compositions (X1-2) to (X1-18), (rX-19) containing the first treatment agent)

[0179] Compositions (X1-2) to (X1-18) and (rX-19) containing the first treatment agent were prepared in the same manner as the composition (X1-1) containing the first treatment agent, wherein the first treatment agent and the solvent (S) were contained in the ratios shown in Table 2. The type and content of the first treatment agent, and the type and content of the solvent (S) are shown in the "First Treatment Agent" column and the "Solvent (S)" column of Table 2, respectively.

[0180] [Table 2]

[0181]

[0182] Test group 3 (preparation of the second treatment agent)

[0183] (Second treatment agent (2-1))

[0184] The second treatment agent (2-1) was prepared by the following preparation method using the components shown in Table 3. As shown in Table 3, the second treatment agent (2-1) containing 100 parts (%) of a nonionic surfactant (B-13) as a nonionic surfactant (B2) was prepared.

[0185] (Second treatment agent (2-2) to (2-10))

[0186] The second treatment agents (2-2) to (2-10) were prepared in the same manner as the second treatment agent (2-1) so as to contain the nonionic surfactant (B2) at the ratio shown in Table 3. The type and content of the nonionic surfactant (B2) are shown in the "Nonionic surfactant (B2)" column of Table 3.

[0187] The metal ion concentration detected from the nonvolatile component of the second treatment agent is shown in the "Metal ion concentration detected from the nonvolatile component of the second treatment agent" column of Table 3. The metal ion concentration detected from the nonvolatile component was measured by ICP emission spectrometry as shown below.

[0188] ICP luminescence spectrometry

[0189] The second treatment agent was added to distilled water to prepare an aqueous solution having a concentration of 0.01 mass %. The concentrations of potassium, sodium, calcium, and magnesium contained in the 0.01 mass % aqueous solution were measured using an ICP emission spectrometer (ICPE-9000 manufactured by Shimadzu Corporation).

[0190] [Table 3]

[0191]

[0192] Test group 4 (treatment agent preparation 1)

[0193] The first treatment agent obtained in test group 1 and the second treatment agent obtained in test group 3 were mixed at the ratio shown in Table 4 by the following method to finally prepare an emulsion treatment agent.

[0194] (Example 1)

[0195] First, 95 g of ion exchange water was weighed and stirred at 500 rpm for 3 minutes in a water bath at 80°C using a propeller stirring blade. 2.5 g of the first treatment agent 1-1 was dripped into the beaker using a dropper, and then 2.5 g of the second treatment agent 2-1 was dripped using a dropper and stirred for 5 minutes. The resulting diluted solution of the treatment agent was used as the 5% emulsion (non-volatile content 5%) of Example 1.

[0196] (Examples 2 to 34)

[0197] In Examples 2 to 34, the first treatment agent and the second treatment agent were mixed in the ratio shown in Table 4 in the same manner as in Example 1, thereby preparing a 5% emulsion as a dilution solution of the treatment agent.

[0198] The type and content of the first treatment agent, and the type and content of the second treatment agent are shown in the "First Treatment Agent" column and the "Second Treatment Agent" column of Table 4, respectively. In addition, the mass ratio of the first treatment agent to the second treatment agent is shown in the "Mass Ratio (First Treatment Agent / Second Treatment Agent)" column of Table 4.

[0199] [Table 4]

[0200]

[0201] Test Group 5 (Preparation of Treatment Agent 2)

[0202] Without going through the steps of preparing the first treatment agent and the second treatment agent, the components shown in Table 5 were mixed at a predetermined ratio to prepare the treatment agent.

[0203] (Treatment agent (r3-1))

[0204] As shown in Table 5, the treatment agent (r3-1) contains 9 parts (%) of potassium salt of lard sulfate (A-7) as sulfate ester salt (A), 9 parts (%) of polyoxyethylene (5 mol) stearyl ester (iodine value: 0) (B-6) as nonionic surfactant (B2) and 40 parts (%) of polyoxyethylene (10 mol) oleyl ester (iodine value: 35) (B-15) as nonionic surfactant (B2), 3 parts (%) of sodium salt of tall oil fatty acid sulfate (C-1) and 3 parts (%) of sodium salt of polyoxyethylene (3 mol) tallow alcohol sulfate (C-5) as anionic surfactant (C), and as oil (D) having a kinematic viscosity of about 10 mm at 20°C. 2 / s of mineral oil (D-1) 15 parts (%) and tallow (D-5) 21 parts (%) to obtain a treatment agent (r3-1) initially prepared in the form of a mixture.

[0205] (Treatment agent (r3-2) to (r3-4))

[0206] Treatment agents (r3-2) to (r3-4) were prepared in the same manner as treatment agent (r3-1) in such a manner that they contained a sulfate ester salt (A), a nonionic surfactant (B2), an anionic surfactant (C) and an oil (D) in the ratios shown in Table 5.

[0207] The type and content of sulfate (A), the type and content of nonionic surfactant (B2), the type and content of anionic surfactant (C), and the type and content of oil (D) are shown in the "Sulfate (A)" column, "Nonionic surfactant (B2)" column, "Anionic surfactant (C)" column, and "Oil (D)" column of Table 5, respectively. In addition, the mass ratio of the content of sulfate (A) to the content of nonionic surfactant (B2) is shown in the "Mass ratio (sulfate (A) / nonionic surfactant (B2))" column of Table 5.

[0208] [Table 5]

[0209]

[0210] Test Group 6 (Adhesion of the dilution of the treatment agent to viscose rayon fibers)

[0211] The dilutions of the treatment agents of each example obtained in test group 4 were further diluted to prepare 1% emulsions of the treatment agents. Each aqueous emulsion was sprayed with oil so that the adhesion amount (excluding the solvent) was 0.3% by mass on a 1.3×10-mm-thick glass fiber. -4The viscose rayon fibers with a density of 1.2 g / m (1.2 denier) and a fiber length of 38 mm were dried in a hot air dryer at 80°C for 2 hours. The fibers were then humidified overnight in an atmosphere of 25°C × 40% RH to obtain viscose rayon fibers to which the treatment agent had been attached. The obtained viscose rayon fibers were evaluated for web uniformity in the high-speed carding process, roll winding, scum prevention and yarn loop formation in the drawing process, scum prevention in the high-speed rotor free-end spinning process, workability in vortex air spinning, and roll winding in the ring spinning process.

[0212] Test Group 7 (Preparation Stability)

[0213] The composition containing the first treatment agent obtained in test group 2, the second treatment agent obtained in test group 3, and the treatment agent of test group 5 prepared without going through the process of preparing the first treatment agent and the second treatment agent were evaluated for formulation stability. That is, after preparing the composition containing the first treatment agent, the second treatment agent, and the treatment agent, they were left to stand for 24 hours in a liquid state, and the appearance was visually observed and evaluated according to the following criteria. The results are shown in the "Preparation Stability" column of Table 2, Table 3, and Table 5.

[0214] Evaluation criteria for formulation stability

[0215] ◎ (good): No turbidity or separation was observed, and the surface was uniform.

[0216] ○ (Pass): Some particles were observed, but there was no problem

[0217] × (Unqualified): The appearance is turbid or the product is severely separated, which is a problem

[0218] Test Group 8 (Evaluation of web uniformity in high-speed carding process)

[0219] 10 kg of treated viscose rayon fibers were fed to a flat carding machine (manufactured by Howa Kogyo Co., Ltd.) at an atmosphere of 30°C x 70% RH and passed through the carding machine at a spinning speed of 140 m / min. The uniformity of the carded web spun was evaluated according to the following criteria. The results are shown in the "web uniformity" column of Table 4.

[0220] Evaluation criteria for web uniformity

[0221] ◎ (Good): No unevenness at all, excellent and uniform

[0222] ○ (Pass): Slight unevenness is observed but is not a problem

[0223] × (Unacceptable): Unevenness and problems can be confirmed

[0224] Test group 9 (Evaluation of the number of times of roller winding in the drawing process, scum prevention, and loop formation)

[0225] 10 kg of viscose rayon fiber was supplied to a flat carding machine (manufactured by Howa Industry Co., Ltd.) to obtain raw sliver. The obtained raw sliver was supplied to a PDF type drawing frame (manufactured by Ishikawa Manufacturing Co., Ltd.) in an atmosphere of 30°C × 70% RH, and was repeatedly passed through 5 times under the condition of a spinning speed of 250 m / min. The number of windings on the rubber roller of the PDF type drawing frame was evaluated according to the following criteria. In addition, the degree of scum of each part of the rubber roller, roving frame and bugle head and the yarn loop formation of the raw sliver were visually evaluated according to the following criteria. The results are shown in the "Drawing Process" column of Table 4.

[0226] Evaluation criteria for the number of times the rubber roller is wound

[0227] ◎(Good): 0 to 4 times

[0228] ○(Pass): 5 to 9 times

[0229] ×(failed): more than 10 times

[0230] Evaluation criteria for scum prevention

[0231] ◎ (Good): Almost no scum was found

[0232] ○ (Pass): A small amount of scum was found

[0233] × (Unqualified): A large amount of scum is found

[0234] Evaluation criteria for loop formation

[0235] ◎ (Good): The yarn loop is well formed

[0236] ○ (Pass): The yarn loop formation is pass

[0237] × (failed): The yarn loop is not formed properly

[0238] Test Group 10 (Evaluation of scum prevention in high-speed rotor free-end spinning process)

[0239] 10 kg of the above-mentioned treated viscose rayon fibers were supplied to a flat carding machine (manufactured by Howa Industry Co., Ltd.) to obtain raw sliver. The obtained raw sliver was supplied to a PDF type drawing frame (manufactured by Ishikawa Seisakusho) to obtain drawn sliver. The obtained drawn sliver was operated at a rotor speed of 130,000 rpm for 1 hour using a high-speed rotor free-end spinning machine (manufactured by Schlafhorst) in an atmosphere of 25°C×65%RH. The scum accumulation in the rotor of the free-end spinning machine was visually evaluated according to the following criteria. The results are shown in the "High-speed rotor free-end spinning process" column of Table 4.

[0240] Evaluation criteria for scum prevention

[0241] ◎ (Good): Almost no scum accumulation was observed

[0242] ○ (Pass): Slight accumulation of scum is observed, but not a problem

[0243] × (Unqualified): Scum accumulation is observed and there are problems

[0244] Test Group 11 (Evaluation of vortex air spinning operability)

[0245] 10 kg of treated viscose rayon fiber was fed to a flat carding machine (manufactured by Howa Industry Co., Ltd.) to obtain raw sliver. The raw sliver obtained was fed to a PDF type drawing frame to obtain a drawn sliver. The drawn sliver obtained was fed to a vortex air spinning machine and operated at a spinning speed of 400 m / min for 2 hours, and the number of broken yarns was measured. The results are shown in the "vortex air spinning" column of Table 4.

[0246] ·Evaluation criteria for vortex air spinning operability

[0247] ◎(Good): Wire breakage 0 times

[0248] ○(Qualified): Wire breakage times 1 to 3 times

[0249] × (Unqualified): Wire breakage more than 4 times

[0250] Test Group 12 (Evaluation of the Number of Roller Windings in Ring Spinning Process)

[0251] 10 kg of treated viscose rayon fiber was fed to a flat carding machine (manufactured by Howa Industries) to obtain raw sliver. The raw sliver obtained was fed to a PDF drawing frame (manufactured by Ishikawa Industries) to obtain drawn sliver. The drawn sliver obtained was fed to a roving frame (manufactured by Toyota Industries) to obtain thick yarn. The obtained thick yarn was fed to a ring spinning frame, and the number of times the rubber roller was wrapped when the shaft speed was 18,000 rpm was measured. The results are shown in the "Ring Spinning Process" column of Table 4.

[0252] Evaluation criteria for the number of times the rubber roller is wound

[0253] ◎(Good): 0 to 4 times

[0254] ○(Pass): 5 to 9 times

[0255] ×(failed): more than 10 times

[0256] The first treatment agent, the second treatment agent and the composition containing the first treatment agent of the present invention can improve the formulation stability. In addition, the fiber to which the treatment agent obtained by the first treatment agent etc. is applied can improve the function such as the uniformity of the web.

[0257] The present disclosure also includes the following aspects.

[0258] (Note 1)

[0259] A first treatment agent for regenerated cellulose fiber, which is used with an iodine value of 1gI 2 The first treatment agent for regenerated cellulose fibers used in combination with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 100 g / cm2, characterized in that the agent is configured to be separated from the second treatment agent for regenerated cellulose fibers except when used, and contains the following sulfate ester salt (A), and an iodine value of less than 1 g / cm2. 2 / 100g of the nonionic surfactant (B1), the mass ratio of the content of the above-mentioned sulfate ester salt (A) to the content of the above-mentioned nonionic surfactant (B1) is sulfate ester salt (A) / nonionic surfactant (B1) = 50 / 50 to 99 / 1.

[0260] Sulfate ester salt (A): a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0261] (Note 2)

[0262] The first treatment agent for regenerated cellulose fibers according to Appendix 1, wherein the nonionic surfactant (B1) comprises a compound in which an alkylene oxide having 2 to 3 carbon atoms is added in a total ratio of 1 mol to 20 mol relative to 1 mol of an aliphatic alcohol having 8 to 24 carbon atoms or a fatty acid having 8 to 24 carbon atoms.

[0263] (Note 3)

[0264] The first treating agent for regenerated cellulose fibers according to Appendix 1 or 2, wherein the oil (a) is at least one selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow and whale oil.

[0265] (Note 4)

[0266] The first treatment agent for regenerated cellulose fibers according to any one of Appendixes 1 to 3, further comprising at least one selected from the following anionic surfactant (C) and the following oil (D).

[0267] Anionic surfactant (C): at least one selected from alkali metal salts of sulfuric acid esters of fatty acids having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of sulfuric acid esters of compounds obtained by adding alkylene oxides having 2 to 3 carbon atoms in a total ratio of 1 mol to 20 mol per 1 mol of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of phosphoric acid esters of aliphatic alcohols having 8 to 24 carbon atoms, alkali metal salts of aliphatic sulfonic acids having 8 to 24 carbon atoms, and alkali metal salts of aliphatic fatty acids having 8 to 24 carbon atoms.

[0268] Oil (D): at least one selected from hydrocarbon compounds, fats and oils, and ester compounds, all of which are liquid at 70°C.

[0269] (Note 5)

[0270] The first treatment agent for regenerated cellulose fibers according to any one of Appendixes 1 to 4, wherein the potassium concentration detected from the non-volatile components of the second treatment agent for regenerated cellulose fibers by ICP emission spectrometry is 5000 ppm or less, the sodium concentration is 1000 ppm or less, the calcium concentration is 1000 ppm or less, and the magnesium ion concentration is 1000 ppm or less.

[0271] (Note 6)

[0272] The first treating agent for regenerated cellulose fibers according to any one of Appendixes 1 to 5, which is applied to regenerated cellulose fibers for short fiber use.

[0273] (Note 7)

[0274] A treatment agent for regenerated cellulose fibers, characterized in that it comprises a first treatment agent for regenerated cellulose fibers (which, when used, contains an iodine value of 1 gI 2 The first treatment agent for regenerated cellulose fibers used in combination with the second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 100 g / cm2, which is configured to be a separate agent from the second treatment agent for regenerated cellulose fibers except when used, and contains the following sulfate ester salt (A) and an iodine value of less than 1 g / cm2. 2 / 100g of a nonionic surfactant (B1)) or the first treatment agent for regenerated cellulose fibers according to any one of Appendixes 1 to 6, and containing an iodine value of 1gI 2A set of a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) in an amount of 1:1 to 100 g or more.

[0275] Sulfate ester salt (A): a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0276] (Note 8)

[0277] A composition containing a first treatment agent for regenerated cellulose fibers, characterized in that it contains the first treatment agent for regenerated cellulose fibers according to any one of Supplements 1 to 6 and the following solvent (S).

[0278] Solvent (S): a solvent having a boiling point of 105° C. or less at atmospheric pressure.

[0279] (Note 9)

[0280] The composition containing the first treating agent for regenerated cellulose fibers according to Supplementary Note 8, wherein the solvent (S) is water.

[0281] (Note 10)

[0282] The composition containing the first treatment agent for regenerated cellulose fibers according to Appendix 8 or 9, wherein the content ratio of the solvent (S) is 10 mass % or more and 50 mass % or less relative to the total mass of the composition containing the first treatment agent for regenerated cellulose fibers.

[0283] (Note 11)

[0284] A method for preparing a dilution of a treatment agent for regenerated cellulose fibers, characterized in that: a first treatment agent for regenerated cellulose fibers (which is used with an iodine value of 1 gI 2 A first treatment agent for regenerated cellulose fibers used in combination with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 100 g / cm2, which is configured to be separate from the second treatment agent for regenerated cellulose fibers except when used, and contains the following sulfate ester salt (A), and an iodine value of less than 1 g / cm2. 2 / 100g of a nonionic surfactant (B1)), a composition containing a first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 1 to 6, or a composition containing a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 8 to 10; and a composition containing an iodine value of 1 gI 2 The second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 1:1 / 100 g has a nonvolatile content of 0.01% by mass to 20% by mass.

[0285] Sulfate ester salt (A): a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0286] Solvent (S): a solvent having a boiling point of 105° C. or less at atmospheric pressure.

[0287] (Note 12)

[0288] The method for preparing a diluted solution of a treatment agent for regenerated cellulose fibers according to Appendix 11 is characterized in that the mass ratio of the first treatment agent for regenerated cellulose fibers and the second treatment agent for regenerated cellulose fibers is the first treatment agent for regenerated cellulose fibers / the second treatment agent for regenerated cellulose fibers = 40 / 60 to 90 / 10.

[0289] (Note 13)

[0290] The method for preparing a diluted solution of a regenerated cellulose fiber treating agent according to Appendix 11 or 12, characterized in that it undergoes the following step 1 and the following step 2.

[0291] Step 1: A step of adding the first treatment agent for regenerated cellulose fibers or the composition containing the first treatment agent for regenerated cellulose fibers, and the second treatment agent for regenerated cellulose fibers to first water to prepare a diluted solution of the treatment agent for regenerated cellulose fibers having a nonvolatile component concentration greater than 2% by mass and less than 20% by mass.

[0292] Step 2: A step of further adding the diluted solution of the regenerated cellulose fiber-treating agent prepared in step 1 to the second water to prepare a diluted solution of the regenerated cellulose fiber-treating agent having a nonvolatile content concentration of 0.01% by mass to 2% by mass.

[0293] (Note 14)

[0294] A method for treating regenerated cellulose fibers, characterized in that: a first treating agent for regenerated cellulose fibers (which is used with an iodine value of 1 gI 2 A first treatment agent for regenerated cellulose fibers used in combination with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 100 g / cm2, which is configured to be separate from the second treatment agent for regenerated cellulose fibers except when used, and contains the following sulfate ester salt (A), and an iodine value of less than 1 g / cm2. 2 / 100g of a nonionic surfactant (B1)), a composition containing a first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 1 to 6, or a composition containing a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 8 to 10; and a composition containing an iodine value of 1 gI 2 / 100g or more of the nonionic surfactant (B2) in a second treatment agent for regenerated cellulose fibers, and a diluted solution of the obtained treatment agent for regenerated cellulose fibers is applied to the regenerated cellulose fibers.

[0295] Sulfate ester salt (A): a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0296] Solvent (S): a solvent having a boiling point of 105° C. or less at atmospheric pressure.

[0297] (Note 15)

[0298] The method for treating regenerated cellulose fibers according to Appendix 14 is characterized in that the mass ratio of the first treating agent for regenerated cellulose fibers to the second treating agent for regenerated cellulose fibers is: the first treating agent for regenerated cellulose fibers / the second treating agent for regenerated cellulose fibers=40 / 60 to 90 / 10.

[0299] (Note 16)

[0300] A method for producing regenerated cellulose fibers, comprising the step of attaching a dilution of a regenerated cellulose fiber treatment agent to the regenerated cellulose fibers, wherein the dilution is prepared by adding a first regenerated cellulose fiber treatment agent (which is used in combination with an iodine value of 1 gI) to water. 2 A first treatment agent for regenerated cellulose fibers used in combination with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) of at least 100 g / cm2, which is a separate agent from the second treatment agent for regenerated cellulose fibers except when used, and contains the following sulfate ester salt (A), and an iodine value of less than 1 g / cm2. 2 / 100g of a nonionic surfactant (B1)), a composition containing a first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 1 to 6, or a composition containing a first treatment agent for regenerated cellulose fibers as described in any one of Supplements 8 to 10; and a composition containing an iodine value of 1 gI 2 The regenerated cellulose fibers containing a nonionic surfactant (B2) in an amount of 1:1 to 1:1 are obtained by treating with a second treatment agent.

[0301] Sulfate ester salt (A): a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

[0302] Solvent (S): a solvent having a boiling point of 105° C. or less at atmospheric pressure.

Claims

1. A first treatment agent for regenerated cellulose fibers, which is used in combination with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100 g or more, characterized in that: The first treatment agent for regenerated cellulose fibers is separately constituted from the second treatment agent for regenerated cellulose fibers except when used, and contains a sulfate ester salt (A) and a nonionic surfactant (B1) having an iodine value of less than 1 gI2 / 100 g. The mass ratio of the content of the sulfate ester salt (A) to the content of the nonionic surfactant (B1) is sulfate ester salt (A) / nonionic surfactant (B1)=50 / 50 to 99 / 1, The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

2. The first treating agent for regenerated cellulose fibers according to claim 1, wherein The nonionic surfactant (B1) includes a compound in which an alkylene oxide having 2 to 3 carbon atoms is added in a total ratio of 1 to 20 mol per mol of an aliphatic alcohol having 8 to 24 carbon atoms or a fatty acid having 8 to 24 carbon atoms.

3. The first treating agent for regenerated cellulose fibers according to claim 1 or 2, wherein The oil (a) is at least one selected from castor oil, sesame oil, tall oil, soybean oil, rapeseed oil, palm oil, lard, beef tallow and whale oil.

4. The first treating agent for regenerated cellulose fibers according to claim 1 or 2, wherein The first treatment agent for regenerated cellulose fibers further contains at least one selected from an anionic surfactant (C) and oil (D), The anionic surfactant (C) is at least one selected from the group consisting of an alkali metal salt of a sulfuric acid ester of a fatty acid having 8 to 24 carbon atoms, an alkali metal salt of a sulfuric acid ester of an aliphatic alcohol having 8 to 24 carbon atoms, an alkali metal salt of a sulfuric acid ester of a compound obtained by adding an alkylene oxide having 2 to 3 carbon atoms in a total ratio of 1 mol to 20 mol per 1 mol of an aliphatic alcohol having 8 to 24 carbon atoms, an alkali metal salt of a phosphoric acid ester of an aliphatic alcohol having 8 to 24 carbon atoms, an alkali metal salt of an aliphatic sulfonic acid having 8 to 24 carbon atoms, and an alkali metal salt of an aliphatic fatty acid having 8 to 24 carbon atoms. The oil (D) is at least one selected from hydrocarbon compounds, fats and oils, and ester compounds, all of which are liquid at 70°C.

5. The first treating agent for regenerated cellulose fibers according to claim 1 or 2, wherein The potassium concentration detected from the nonvolatile component of the second treatment agent for regenerated cellulose fibers by ICP emission spectrometry was 5000 ppm or less, the sodium concentration was 1000 ppm or less, the calcium concentration was 1000 ppm or less, and the magnesium ion concentration was 1000 ppm or less.

6. A treatment agent for regenerated cellulose fibers, characterized in that The kit comprises a first treatment agent for regenerated cellulose fibers and a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100 g or more, wherein the first treatment agent for regenerated cellulose fibers is used together with the second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100 g or more when used, but is separately constituted from the second treatment agent for regenerated cellulose fibers when not in use and contains a sulfate ester salt (A) and a nonionic surfactant (B1) having an iodine value of less than 1 gI2 / 100 g, or the first treatment agent for regenerated cellulose fibers according to any one of claims 1 to 5, The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals.

7. A composition containing a first treatment agent for regenerated cellulose fibers, characterized in that: The invention comprises the first treating agent for regenerated cellulose fibers according to any one of claims 1 to 5 and a solvent (S), wherein the boiling point of the solvent (S) at atmospheric pressure is 105°C or less.

8. The composition containing the first treating agent for regenerated cellulose fibers according to claim 7, wherein The solvent (S) is water.

9. The composition containing the first treating agent for regenerated cellulose fibers according to claim 7 or 8, wherein The content ratio of the solvent (S) is 10 mass % or more and 50 mass % or less relative to the total mass of the composition containing the first treatment agent for regenerated cellulose fibers.

10. A method for preparing a dilution solution of a treatment agent for regenerated cellulose fibers, characterized in that: A first treatment agent for regenerated cellulose fibers containing a sulfate ester salt (A) and a nonionic surfactant (B1) having an iodine value of less than 1 gI2 / 100g, which is used together with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more when used but is separately constituted from the second treatment agent for regenerated cellulose fibers when not in use, a composition containing the first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), the first treatment agent for regenerated cellulose fibers according to any one of claims 1 to 5 or the composition containing the first treatment agent for regenerated cellulose fibers according to any one of claims 7 to 9, and a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more are added to water so that the nonvolatile content concentration in the obtained dilution is 0.01 mass % or more and 20 mass % or less, The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals. The boiling point of the solvent (S) at atmospheric pressure is 105° C. or less.

11. The method for preparing a dilution solution of a treatment agent for regenerated cellulose fibers according to claim 10, characterized in that: The mass ratio of the first treatment agent for regenerated cellulose fibers to the second treatment agent for regenerated cellulose fibers is: the first treatment agent for regenerated cellulose fibers / the second treatment agent for regenerated cellulose fibers=40 / 60 to 90 / 10.

12. A method for preparing a dilution of a regenerated cellulose fiber treating agent, which is the method for preparing a dilution of a regenerated cellulose fiber treating agent according to claim 10 or 11, characterized in that: After process 1 and process 2, The step 1 is a step of adding the first treatment agent for regenerated cellulose fibers or a composition containing the first treatment agent for regenerated cellulose fibers and the second treatment agent for regenerated cellulose fibers to first water to prepare a dilution of the treatment agent for regenerated cellulose fibers having a non-volatile component concentration of greater than 2% by mass and less than 20% by mass; The step 2 is a step of further adding the diluted solution of the regenerated cellulose fiber treating agent prepared in the step 1 to the second water to prepare a diluted solution of the regenerated cellulose fiber treating agent having a nonvolatile content concentration of 0.01 mass % to 2 mass %.

13. A method for treating regenerated cellulose fibers, characterized in that: A first treatment agent for regenerated cellulose fibers containing a sulfate ester salt (A) and a nonionic surfactant (B1) having an iodine value of less than 1 gI2 / 100g, which is used together with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more when used but is separately constituted from the second treatment agent for regenerated cellulose fibers when not in use, a composition containing the first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), the first treatment agent for regenerated cellulose fibers according to any one of claims 1 to 5 or the composition containing the first treatment agent for regenerated cellulose fibers according to any one of claims 7 to 9, and a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more are added to water, and the resulting diluted solution of the treatment agent for regenerated cellulose fibers is applied to the regenerated cellulose fibers, The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals. The boiling point of the solvent (S) at atmospheric pressure is 105° C. or less.

14. The method for treating regenerated cellulose fibers according to claim 13, characterized in that: The mass ratio of the first treatment agent for regenerated cellulose fibers to the second treatment agent for regenerated cellulose fibers is: the first treatment agent for regenerated cellulose fibers / the second treatment agent for regenerated cellulose fibers=40 / 60 to 90 / 10.

15. A method for producing regenerated cellulose fiber, characterized in that: The method comprises the steps of adding a first treatment agent for regenerated cellulose fibers which contains a sulfate ester salt (A) and a nonionic surfactant (B1) having an iodine value of less than 1 gI2 / 100g and is used together with a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more when used but is separately constituted from the second treatment agent for regenerated cellulose fibers when not in use, a composition containing the first treatment agent for regenerated cellulose fibers containing the first treatment agent for regenerated cellulose fibers and the following solvent (S), the first treatment agent for regenerated cellulose fibers according to any one of claims 1 to 5 or the composition containing the first treatment agent for regenerated cellulose fibers according to any one of claims 7 to 9, and a second treatment agent for regenerated cellulose fibers containing a nonionic surfactant (B2) having an iodine value of 1 gI2 / 100g or more, to water, and applying the obtained diluted solution of the treatment agent for regenerated cellulose fibers to the regenerated cellulose fibers, The sulfate ester salt (A) is a neutralized salt of a reaction product of fat (a) and sulfuric acid and at least one selected from amines, alkali metals and alkaline earth metals. The boiling point of the solvent (S) at atmospheric pressure is 105° C. or less.

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