JP2014101586A - Synthetic fiber treatment agent for paper making, method of manufacturing synthetic fiber for paper making and method of manufacturing of paper making nonwoven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic fiber treatment agent for paper making capable of providing excellent settleability, low shear dispersibility, antifoaming properties, defoaming properties to a synthetic fiber for paper making used in paper making nonwoven fabric.SOLUTION: The synthetic fiber treatment agent contains an A component of a polyester compound obtained by polycondensating at least one dicarboxylic acid (derivative) selected from aromatic dicarboxylic acid, aliphatic dicarboxylic acid having 4 to 22 carbon atoms and ester formative derivative thereof, and at least one kind selected from alkylene glycol, polyalkylene glycol and polyalkylene glycol, a B component of at least one kind selected from a B1 component represented by the formula (1) and a B2 component represented by the formula (2), and a C component of fatty acid soap having 8 to 22 carbon atoms, and the percentage of the A component is 20 to 85 wt.%, the percentage of the B component is 10 to 60 wt.% and the percentage of the C component is 5 to 40 wt.% in a nonvolatile content of the treatment agent.

Description

  The present invention relates to a synthetic fiber treatment agent for papermaking, a method for producing a synthetic fiber for papermaking, and a method for producing a papermaking nonwoven fabric.

  Conventionally, vinylon, rayon, natural cellulose, polypropylene, and polyacrylonitrile fibers have been widely used as synthetic fibers for papermaking. In recent years, however, hydrophobic synthetic fibers such as polyolefin fibers and polyester fibers that have a unique and flexible texture, have dimensional stability, heat resistance, and cost are low in terms of sophistication of required performance. Papermaking nonwoven fabrics (simply referred to as papermaking) obtained by making papermaking synthetic fibers made from limelight are in the spotlight.

  However, the products currently in practical use are not fully utilizing the superior performance of hydrophobic synthetic fibers themselves. In particular, in the papermaking process, a synthetic fiber treatment agent for papermaking that can improve the sedimentation and dispersibility of hydrophobic synthetic fibers, improve the production rate, and suppress the generation of bubbles has not yet been found. Currently.

  As a synthetic fiber treating agent for papermaking, for example, in Patent Document 1, a polyester polyether block copolymer is disclosed. However, the treatment agent according to Patent Document 1 has poor sedimentation and low shear dispersibility, and as a result, uniform dispersion of the synthetic fiber bundle in the dispersion bath is insufficient. Patent Document 2 discloses a mixture comprising a polyethylene glycol fatty acid monoester and a fatty acid soap. However, the treatment agent according to Patent Document 2 has a lot of foaming in the paper making process, and the generated bubbles adhere to the fibers, so that uniform dispersion in the dispersion bath is insufficient. Moreover, it cannot be said that the settling property of the fibers is good.

  As described above, even when these treatment agents are used, the foam suppressing property, defoaming property, sedimentation property, and low shear dispersibility required for the current synthetic fiber for papermaking are at an insufficient level, and high quality. A nonwoven fabric cannot be obtained.

Japanese Examined Patent Publication No. 58-208500 Japanese Patent Laid-Open No. 2004-238774

  The objectives of the present invention are excellent settling (making fibers settle quickly), low shear dispersibility (dispersing fibers with low share), foam suppression, for papermaking synthetic fibers used in papermaking nonwovens. Of synthetic fibers for paper making that can provide the properties (suppressing the generation of bubbles in the paper making process) and defoaming properties (removing bubbles adhering to the fibers), and the production of synthetic fibers for paper making using the processing agents It is in providing the method and the manufacturing method of a papermaking nonwoven fabric.

  In order to solve the above-mentioned problems, the present inventors have intensively studied. As a result, the present inventors have found that the above-mentioned problems can be solved by using a synthetic fiber treatment agent for papermaking containing a specific component as an essential component. .

  That is, the synthetic fiber treating agent for papermaking of the present invention includes at least one dicarboxylic acid (derivative) selected from aromatic dicarboxylic acids, aliphatic dicarboxylic acids having 4 to 22 carbon atoms, and ester-forming derivatives thereof, and alkylene. A component which is a polyester compound obtained by polycondensation of at least one selected from glycol, polyalkylene glycol and polyalkylene glycol derivatives, a B1 component represented by the following chemical formula (1), and a chemical formula (2) Including at least one B component selected from the B2 component and C component which is a fatty acid soap having 8 to 22 carbon atoms, and the proportion of the A component in the non-volatile content of the treatment agent is 20 to 85% by weight Yes, the proportion of the B component is 10 to 60% by weight, and the proportion of the C component is 5 to 40% by weight.

（但し、式中、Ｒ^１は炭素数７〜２１の直鎖脂肪族炭化水素基である。Ａは炭素数２〜４のアルキレン基であり、ｍは２〜１００の整数である。）

(In the formula, R ¹ is a linear aliphatic hydrocarbon group having 7 to 21 carbon atoms. A is an alkylene group having 2 to 4 carbon atoms, and m is an integer of 2 to 100.)

（但し、式中、Ｒ^２及びＲ^３は、それぞれ独立して炭素数１〜２０の脂肪族炭化水素基であり、Ｒ^２とＲ^３の炭素数の合計が７〜２１である。Ｂは炭素数２〜４のアルキレン基であり、ｎは２〜４０の整数である。）

(However, in the formula, R ² and R ³ are each independently an aliphatic hydrocarbon group having 1 to 20 carbon atoms, and the total number of carbon atoms of R ² and R ³ is 7 to 21. B is (It is a C2-C4 alkylene group, and n is an integer of 2-40.)

  The B component is preferably composed of the B1 component and the B2 component.

  The weight ratio (B1 / B2) between the B1 component and the B2 component is preferably 80/20 to 20/80.

  The pour point of the component B1 is preferably 15 ° C. or higher.

  The surface tension (20 ° C.) of the 1% by weight aqueous solution of Component B2 is preferably 25 to 32 mN / m.

  The component A is represented by the dicarboxylic acid (derivative), an alkylene glycol represented by the following chemical formula (3) and / or a polyalkylene glycol represented by the following general formula (4), and the following chemical formula (5). A polyester compound obtained by polycondensation of polyalkylene glycol or a derivative thereof is preferable.

（但し、式中、Ｒ^４は炭素数２〜８の脂肪族炭化水素基又は炭素数２〜８の脂環族炭化水素基である。）

(However, in the formula, R ⁴ is an aliphatic hydrocarbon group having 2 to 8 carbon atoms or an alicyclic hydrocarbon group having 2 to 8 carbon atoms.)

（但し、式中、Ｒ^５は炭素数２〜４のアルキレン基であり、ｐは２〜１９の整数である。）

(In the formula, R ⁵ is an alkylene group having 2 to 4 carbon atoms, and p is an integer of 2 to 19).

（但し、式中、Ｒ^６は炭素数２〜４のアルキレン基であり、ｑは２０〜２００の整数であり、Ｒ^７は水素原子、脂肪族炭化水素基又は芳香族基である。）

(Wherein, R ⁶ is an alkylene group having 2 to 4 carbon atoms, q is an integer of 20 to 200, and R ⁷ is a hydrogen atom, an aliphatic hydrocarbon group or an aromatic group.)

  The total proportion of the A component, B component, and C component in the nonvolatile content of the treatment agent is preferably 80% by weight or more.

  The treatment agent is an aqueous liquid further containing water, and the ratio of the nonvolatile content in the whole treatment agent is preferably 0.05 to 50% by weight.

  The manufacturing method of the synthetic fiber for papermaking of this invention includes the process of processing said processing agent to raw material synthetic fiber.

  The manufacturing method of the papermaking nonwoven fabric of this invention includes the process of making papermaking by disperse | distributing the synthetic fiber for papermaking processed with said processing agent in water.

The synthetic fiber treating agent for papermaking of the present invention can impart excellent sedimentation, low shear dispersibility, foam suppression and defoaming properties in the papermaking process to the synthetic fiber for papermaking.
According to the method for producing a synthetic fiber for papermaking of the present invention, a synthetic fiber for papermaking having excellent sedimentation property, low shear dispersibility, foam suppression property and defoaming property can be obtained in the papermaking process.
The method for producing a papermaking nonwoven fabric according to the present invention can provide a papermaking nonwoven fabric having high productivity and uniform and good texture.

  The synthetic fiber treating agent for papermaking of the present invention (hereinafter sometimes referred to as a treating agent) contains A component, B component and C component as essential components. Hereinafter, each component which comprises the processing agent of this invention is demonstrated.

[Component A]
The component A includes at least one dicarboxylic acid (derivative) selected from aromatic dicarboxylic acids, aliphatic dicarboxylic acids having 4 to 22 carbon atoms, and ester-forming derivatives thereof, alkylene glycol, polyalkylene glycol, and polyalkylene glycol. A polyester compound obtained by polycondensation with at least one selected from these derivatives (hereinafter sometimes referred to as a glycol component). By using the component A, it is possible to impart good dispersibility and foam suppression to the synthetic fiber.

  An ester-forming derivative is a derivative of a carboxylic acid, which can form a carboxylic acid ester with a hydroxyl group-containing compound by an esterification reaction or an ester substitution reaction. Specific examples of ester-forming derivatives include aromatic dicarboxylic acids and esters of aliphatic dicarboxylic acids having 4 to 22 carbon atoms, acid anhydrides and amides.

  The dicarboxylic acid (derivative) is not particularly limited. For example, aromatic dicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid; oxalic acid, glutaric acid, adipic acid, and pimelic acid Aliphatic dicarboxylic acids having 4 to 22 carbon atoms such as sebacic acid; aromatic dicarboxylic acid esters such as dimethyl terephthalate, dimethyl 5-sulfoisophthalate, dimethyl 1,4-naphthalenedicarboxylate, and dimethyl adipate; And ester-forming derivatives of aliphatic dicarboxylic acids of ˜22. These dicarboxylic acids (derivatives) may be used alone or in combination of two or more. Of the dicarboxylic acids (derivatives), aromatic dicarboxylic acids are preferred, terephthalic acid and isophthalic acid are more preferred, and combined use of terephthalic acid and isophthalic acid is particularly preferred.

Although there is no limitation in particular as alkylene glycol, The alkylene glycol represented by the said Chemical formula (3) is preferable. In the chemical formula (3), R ⁴ is an aliphatic hydrocarbon group having 2 to 8 carbon atoms or an alicyclic hydrocarbon group having 2 to 8 carbon atoms. The number of carbon atoms in R ⁴ is 2 to 6 preferably 2 to 4 is more preferred.

  Specific examples of the alkylene glycol include ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, 1,8-octanediol, 1,4-cyclohexanedimethanol and the like. Among these, ethylene glycol, propylene glycol, and butylene glycol are preferable, and ethylene glycol is more preferable. One or more alkylene glycols may be used.

  The polyalkylene glycol or derivative thereof is not particularly limited, and examples thereof include polyalkylene glycol represented by the above chemical formula (4), polyalkylene glycol represented by the above chemical formula (5), and derivatives thereof. One or more polyalkylene glycols or derivatives thereof may be used. Here, the derivative of polyalkylene glycol means one in which one of the two terminal hydroxyl groups of the polyalkylene glycol molecule is blocked with an organic group.

In the chemical formula (4), R ⁵ is an alkylene group having 2 to 4 carbon atoms. That is, the (OR ⁵ ) moiety is an oxyalkylene group, an oxyethylene group having 2 carbons, an oxypropylene group having 3 carbons, and an oxybutylene group having 4 carbons. These oxyalkylene groups may be used alone or in combination of two or more. The (H (OR ⁵ ) _p O) moiety is a polyalkylene glycol moiety, but the bonding form when two or more oxyalkylenes are used in combination may be random or block. In addition, the polyalkylene glycol moiety is preferably bonded at a ratio of oxyethylene group / oxypropylene group = 100/0 to 40/60 (molar ratio), and more preferably bonded to only the oxyethylene group.

In the chemical formula (4), p is an integer of 2 to 19, preferably 2 to 10, and more preferably 2 to 3.
Examples of the polyalkylene glycol represented by the chemical formula (4) include diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, dibutylene glycol, and tributylene glycol.

In the chemical formula (5), R ⁶ is an alkylene group having 2 to 4 carbon atoms. That is, the (OR ⁶ ) moiety is an oxyalkylene group, an oxyethylene group having 2 carbon atoms, an oxypropylene group having 3 carbon atoms, and an oxybutylene group having 4 carbon atoms. These oxyalkylene groups may be used alone or in combination of two or more. The (H (OR ² ) _n O) moiety is a polyalkylene glycol moiety, but the bonding form when two or more oxyalkylenes are used in combination may be random or block. In addition, the polyalkylene glycol moiety is preferably bonded at a ratio of oxyethylene group / oxypropylene group = 100/0 to 40/60 (molar ratio), and more preferably bonded to only the oxyethylene group.

In the chemical formula (5), R ⁷ is a hydrogen atom, an aliphatic hydrocarbon group or an aromatic group.
The aliphatic hydrocarbon group may be linear or branched, and may be saturated or unsaturated. Examples of the aliphatic hydrocarbon group include an alkyl group having 1 to 22 (preferably 1 to 12) carbon atoms. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a lauryl group, a stearyl group, and a behenyl group.
In the present invention, the aromatic group in R ⁷ of the general formula (5) means an organic group containing an aromatic hydrocarbon such as benzene, naphthalene or anthracene, and the number of the aromatic hydrocarbons contained is 1 It is sufficient if there are two or more. When R ⁷ is an aromatic group, the R site bonded to the oxygen atom in the general formula (5) may or may not be an aromatic hydrocarbon moiety. As the aromatic group, for example, phenyl group, toluyl group, xylyl group, styrenated phenyl group, phenylethyl group, distyrenated phenyl group, tristyrenated phenyl group, benzyl group, benzylated phenyl group, dibenzylated phenyl group, Examples thereof include a tribenzylated phenyl group.
R ^{7 in the} general formula (5) is preferably an alkyl group or an aromatic group.

  In chemical formula (5), q is an integer of 20 to 200, preferably 40 to 150, and more preferably 50 to 100. When q is more than 200, good dispersibility may not be imparted. Specific examples of the polyalkylene glycol derivative include polyethylene glycol monophenyl ether (average molecular weight: 3000), polyethylene glycol (average molecular weight 2000), polyethylene glycol monomethyl ether (average molecular weight: 1000), and the like.

  The molar ratio of the dicarboxylic acid (derivative) to the glycol component (dicarboxylic acid (derivative) / glycol component) in producing the component A is preferably 1 / 0.5 to 1/5, and 1 / 0.9. ˜1 / 3 is more preferable, and 1/1 to 1 / 2.0 is more preferable. When the molar ratio of the dicarboxylic acid (derivative) and the alkylene glycol is within this range, the reaction can easily proceed and the amount of unreacted material after the reaction is reduced.

  The component A is represented by the dicarboxylic acid (derivative), the alkylene glycol represented by the chemical formula (3) and / or the polyalkylene glycol represented by the general formula (4), and the chemical formula (5). A polyester compound obtained by polycondensation with polyalkylene glycol or a derivative thereof is preferable. Furthermore, the component A includes the aromatic dicarboxylic acid and / or ester-forming derivative thereof, the alkylene glycol represented by the chemical formula (3) and / or the polyalkylene glycol represented by the general formula (4), A polyester compound obtained by polycondensation with the polyalkylene glycol represented by the above chemical formula (5) or a derivative thereof is preferable. By using such component A, excellent dispersibility and foam suppression can be imparted to the fiber. Moreover, the processing agent excellent in dispersion stability can be obtained.

Molar ratio (dicarboxylic acid (derivative)) with dicarboxylic acid (derivative) in production of component A, alkylene glycol represented by chemical formula (3) and / or polyalkylene glycol represented by general formula (4) / (Alkylene glycol represented by the above chemical formula (3) and / or polyalkylene glycol represented by the above general formula (4)) is preferably 20/80 to 60/40, and preferably 30/70 to 50/50. More preferred is 40/60 to 50/50. When the molar ratio is within this range, the reaction is easy to proceed, and unreacted substances after the reaction are reduced.
The molar ratio of dicarboxylic acid (derivative) to polyalkylene glycol represented by the above chemical formula (5) or a derivative thereof (dicarboxylic acid (derivative) / (polyalkylene glycol represented by the above chemical formula (5) or a derivative thereof) )) Is preferably 100/2 to 100/100, more preferably 100/2 to 100/50, and even more preferably 100/2 to 100/20. When the molar ratio is within this range, good dispersibility can be imparted.

  The reaction for producing the polyester compound can be carried out by appropriately selecting methods and conditions known in the art. Moreover, about reaction pressure, you may carry out by a normal pressure and you may carry out by pressure reduction.

[B component]
The B component is at least one selected from the B1 component represented by the chemical formula (1) and the B2 component represented by the chemical formula (2). By using the B component in combination with the A component and the C component, excellent antifoaming properties, wettability, and low shear dispersibility can be imparted to the fiber.

It is preferable that B component consists of B1 component and B2 component. That is, it is preferable to use the B1 component and the B2 component together as the B component. By using together B1 component and B2 component, the outstanding sedimentation property, defoaming property, and low shear dispersibility can be provided with respect to a fiber.
From the viewpoint of more exerting the above effects, the weight ratio (B1 / B2) of the B1 component and the B2 component is preferably 80/20 to 20/80, more preferably 75/25 to 30/70, and 70/30 to 40 / 60 is more preferable.

(B1 component)
The B1 component is a compound represented by the chemical formula (1). In the chemical formula (1), R ¹ is a linear aliphatic hydrocarbon group having 7 to 21 carbon atoms, and may be either saturated or unsaturated. The number of carbon atoms in R ¹ is preferably 11-21, more preferably 13-19. When the number of carbon atoms is less than 7, the water-suppressing property is deteriorated due to high water solubility. In addition, low share dispersibility deteriorates. On the other hand, when the carbon number exceeds 21, defoaming properties and dispersibility are deteriorated.
Examples of the linear aliphatic hydrocarbon group include n-heptyl group, n-nonyl group, undecyl group, tridecyl group, pentadecyl group, heptadecyl group, 8-heptadecenyl group, nonadecyl group, heicosyl group and the like.

A is an alkylene group having 2 to 4 carbon atoms. Accordingly, AO is an oxyalkylene group, and examples thereof include an oxyethylene group, an oxypropylene group, and an oxybutylene group. Of these, the oxyalkylene group is preferably an oxyethylene group.
When the oxyalkylene group is composed of two or more types of oxyalkylene groups, there are no particular limitations on the bonding type of the different types of oxyalkylene groups, and any bonding type of block, random, or alternating can be used. May be. When the oxyalkylene group includes an oxyethylene group, the ratio of the oxyethylene group to the entire oxyalkylene group is preferably 75 mol% or more, and particularly preferably 100 mol%.

  In the chemical formula (1), m represents the number of oxyalkylene groups and is an integer of 2 to 100. m is preferably 8 to 100, more preferably 10 to 30. When m is less than 2, the fiber sedimentation property may be lowered and the low shear dispersibility may be deteriorated. On the other hand, when m is more than 100, low shear dispersibility may be deteriorated.

  Examples of the component B1 include polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene Oxyethylene arachidyl ether, polyoxyethylene behenyl ether, polyoxyethylene polyoxypropylene octyl ether, polyoxyethylene polyoxypropylene decyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene myristyl ether, polyoxy Ethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene Stearyl ether, polyoxyethylene polyoxypropylene oleyl ether, polyoxyethylene polyoxypropylene arachidyl ether, polyoxyethylene polyoxypropylene behenyl ether, and the like. B1 component may be comprised from 1 type of these, and may be comprised from 2 or more types.

  Moreover, it is preferable that the pour point (measured value according to JIS-K2269) of B1 component is 15 degreeC or more. The pour point is more preferably 15 to 80 ° C, and further preferably 20 to 80 ° C. By using the B1 component having a pour point of 15 ° C. or more in combination with the A component and the C component, the low shear dispersibility is further improved.

  The B1 component can be produced, for example, by subjecting an aliphatic alcohol such as n-octyl alcohol, lauryl alcohol, or oleyl alcohol to an addition reaction with an alkylene oxide such as ethylene oxide in the presence of a catalyst.

(B2 component)
The component B2 is a compound represented by the above chemical formula (2). In the chemical formula (2), R ² and R ³ are each independently an aliphatic hydrocarbon group having 1 to 20 carbon atoms, and the total number of carbon atoms of R ² and R ³ is 7 to 21. The aliphatic hydrocarbon group may be linear, branched, saturated, or unsaturated. The number of carbon atoms of R ² and ^{R 3,} 2-18 by weight, more preferably from 4 to 15. Total number of carbon atoms of R ² and ^{R 3} is preferably 8-19, more preferably 9-16. In the case where the total is less than 7 or more than 21, the sedimentation property is lowered.

R ² and R ³ include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, Examples include pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group and the like.

B is an alkylene group having 2 to 4 carbon atoms. Therefore, BO is an oxyalkylene group, and examples thereof include an oxyethylene group, an oxypropylene group, and an oxybutylene group. Of these, the oxyalkylene group is preferably an oxyethylene group.
When the oxyalkylene group includes an oxyethylene group, the ratio of the oxyethylene group to the entire oxyalkylene group is preferably 75 mol% or more, and particularly preferably 100 mol%. When the oxyalkylene group is composed of two or more types of oxyalkylene groups, there are no particular limitations on the bonding type of the different types of oxyalkylene groups, and any bonding type of block, random, or alternating can be used. May be.

  In the chemical formula (2), n represents the number of oxyalkylene groups and is an integer of 2 to 40, preferably 3 to 20, and more preferably 3 to 15. If n is less than 2, fiber settling may be deteriorated. On the other hand, if n is more than 40, fiber sedimentation may be deteriorated.

  Examples of the B2 component include polyoxyethylene sec-octyl ether, polyoxyethylene sec-nonyl ether, polyoxyethylene sec-decyl ether, polyoxyethylene sec-undecyl ether, polyoxyethylene sec-dodecyl ether, polyoxy Ethylene sec-tridecyl ether, polyoxyethylene sec-tetradecyl ether, polyoxyethylene sec-pentadecyl ether, polyoxyethylene sec-hexadecyl ether, polyoxyethylene sec-heptadecyl ether, polyoxyethylene sec-octadecyl ether , Polyoxyethylene sec-nonadecyl ether, polyoxyethylene sec-icosyl ether, polyoxyethylene sec-henicosyl ether Polyoxyethylene sec-docosyl ether, polyoxyethylene polyoxypropylene sec-octyl ether, polyoxyethylene polyoxypropylene sec-nonyl ether, polyoxyethylene polyoxypropylene sec-decyl ether, polyoxyethylene polyoxypropylene sec- Undecyl ether, polyoxyethylene polyoxypropylene sec-dodecyl ether, polyoxyethylene polyoxypropylene sec-tridecyl ether, polyoxyethylene polyoxypropylene sec-tetradecyl ether, polyoxyethylene polyoxypropylene sec-pentadecyl ether , Polyoxyethylene polyoxypropylene sec-hexadecyl ether, polyoxyethylene polyoxypro Ren sec-heptadecyl ether, polyoxyethylene polyoxypropylene sec-octadecyl ether, polyoxyethylene polyoxypropylene sec-nonadecyl ether, polyoxyethylene polyoxypropylene sec-icosyl ether, polyoxyethylene polyoxypropylene sec- Henicosan ether, polyoxyethylene polyoxypropylene sec-docosyl ether and the like can be mentioned. B2 component may be comprised from 1 type of these, and may be comprised from 2 or more types.

  The B2 component preferably has a surface tension (20 ° C.) of a 1% by weight aqueous solution of 25 to 32 mN / m. The surface tension is more preferably 25 to 31 mN / m, further preferably 26 to 30 mN / m. By using the B2 component having a surface tension of 25 to 32 mN / m in combination with the A component and the C component, the fiber settling property is further improved.

  The B2 component can be produced, for example, by subjecting a saturated alcohol such as sec-dodecyl alcohol or sec-octadecyl alcohol to an addition reaction with an alkylene oxide such as ethylene oxide in the presence of a catalyst.

[C component]
The component C is obtained by neutralizing a fatty acid with a base. By including the C component, it is possible to impart a better dispersibility with a low share to the synthetic fiber for papermaking.
The C component is a fatty acid soap having 8 to 22 carbon atoms, preferably a fatty acid soap having 12 to 22 carbon atoms, and more preferably a fatty acid soap having 16 to 22 carbon atoms. Here, the carbon number means the carbon number of the fatty acid constituting the fatty acid soap.
Specific examples of the fatty acid constituting the component C include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid, and behenic acid. Among these fatty acids, it is preferable that the fatty acid constituting the component C is stearic acid, oleic acid, or ricinoleic acid because the balance between dispersibility and water solubility is good. The fatty acid which comprises C component may be comprised from 1 type of these fatty acids, and may be comprised from 2 or more types. As C component, the fatty acid soap shown by following Chemical formula (6) is mentioned, for example.

（但し、上記化学式（６）において、Ｒ^８は炭素数７〜２１の脂肪族炭化水素基であり、Ｍ^ｒ＋は陽イオンであり、ｒは１以上の整数である。）

(However, in the above chemical formula (6), R ⁸ is an aliphatic hydrocarbon group having 7 to 21 carbon atoms, M ^{r +} is a cation, and r is an integer of 1 or more.)

In the above chemical formula (6), examples of ^{Mr +} include alkali metals such as sodium, potassium and lithium, and alkaline earth metals such as calcium and magnesium. Of these, preferred are alkali metals, and more preferred are sodium and potassium.

R ⁸ has 7 to 21 carbon atoms, preferably 11 to 21 carbon atoms, and particularly preferably 15 to 21 carbon atoms. If the carbon number of R ⁸ is less than 7, good dispersibility may not be obtained because bubbles are generated in the paper making process. On the other hand, when R ⁸ has more than 21 carbon atoms, wettability and dispersibility with a low share may be deteriorated. Furthermore, the cost is increased and it is not suitable for practical use. R ⁸ may be linear or branched and may be saturated or unsaturated. Examples of R ⁸ include an enantyl group, nonyl group, undecyl group, tridecyl group, pentadecyl group, margaryl group, pristane group, cis-9-heptadecenyl group, and the like. Among these, as R ⁸ , an undecyl group, a tridecyl group, a pentadecyl group, a margaryl group, and a pristane group are preferable, and a margaryl group is particularly preferable.

  There is no limitation in particular about the manufacturing method of C component, For example, it can manufacture by neutralizing a C8-C22 fatty acid with a base.

[Other ingredients]
The processing agent of this invention may contain D component which is other surfactant in the range which does not inhibit the effect of this invention. Examples of the component D include nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.

  Examples of the D component include EO adducts of higher fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid; octylamine, decylamine, laurylamine, myristylamine, EO adducts of higher alkylamines such as palmitylamine and stearylamine; monolauric acid glyceride, monomyristic acid glyceride, monopalmitic acid glyceride, monostearic acid glyceride, sorbitan monolaurate, sorbitan monopalmitate, Polyhydric alcohol fatty acid esters such as sorbitan monostearate, sorbitan monooleate, sorbitan trilaurate, sorbitan tripalmitate, sorbitan tristearate, sorbitan trioleate EO adducts thereof; sulfate salts such as octyl sulfate, decyl sulfate, lauryl sulfate, myristyl sulfate, cetyl sulfate, stearyl sulfate, oleyl sulfate; dihexyl sulfosuccinate , Di-2-ethylhexyl sulfosuccinate salt, dilauryl sulfosuccinate salt, dialkyl alkyl sulfosuccinate salt, ditridecyl sulfosuccinate salt, dimyristyl sulfosuccinate salt, distearyl sulfosuccinate salt, etc. Succinate salt: Octyl phosphate ester salt, decyl phosphate ester salt, lauryl phosphate ester salt, myristyl phosphate ester salt, cetyl phosphate ester salt, stearyl phosphate ester salt, oleyl phosphate ester salt, etc. Phosphate salt; Dioctyldimethylammonium chloride salt, Didecyldimethylammonium chloride salt, Dilauryldimethylammonium chloride salt, Distearyldimethylammonium chloride salt, Dicoco alkyldimethylammonium chloride salt, Di-cured tallow alkyldimethylammonium chloride salt, Behenyl Quaternary ammonium salts such as trimethylammonium chloride salt; alkylbetaines such as lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, lauric acid amidopropyldimethylaminoacetic acid betaine, oleic acid amidopropyldimethylaminoacetic acid betaine, stearic acid amidopropyl Amide group-containing betaines such as dimethylaminoacetic acid betaine;

  The treatment agent of the present invention may further contain an antibacterial agent, an antioxidant, a preservative, a matting agent, a pigment, a rust preventive, a fragrance, an antifoaming agent and the like as necessary. Moreover, you may contain inorganic acids and organic acids, such as phosphoric acid and lactic acid, as pH adjustment.

[Synthetic fiber treatment agent for papermaking]
The proportion of the component A in the nonvolatile content of the treatment agent of the present invention is 20 to 85% by weight, preferably 30 to 80% by weight, and more preferably 40 to 70% by weight. If the proportion of the component A is less than 20% by weight, the foam suppression and dispersibility are deteriorated. When the proportion of the component A exceeds 85% by weight, the sedimentation property and initial dispersibility are deteriorated.
The non-volatile content of the treatment agent of the present invention means a component in the treatment agent remaining on the fiber surface even after the heat drying step for removing moisture, etc. It means an absolutely dry component when the solvent is removed and a constant weight is reached.

  The ratio of the B component in the nonvolatile content of the treatment agent of the present invention is 10 to 60% by weight, preferably 15 to 50% by weight, and more preferably 20 to 40% by weight. If the ratio of the component B is less than 10% by weight, the fiber cannot be given wettability, and the sedimentation property, the low shear dispersibility, and the defoaming property are deteriorated. If the ratio of the component B is more than 60% by weight, the foam suppression property is deteriorated.

  The proportion of the C component in the nonvolatile content of the treatment agent of the present invention is 5 to 40% by weight, preferably 5 to 25% by weight, and more preferably 5 to 15% by weight. When the proportion of component C is less than 5% by weight, good low shear dispersibility cannot be imparted. If the proportion of component C is more than 25% by weight, the foam suppression property is deteriorated.

  The total proportion of the A component, the B component and the C component in the treatment agent of the present invention is preferably 80% by weight or more, more preferably 85% by weight or more, further preferably 90% by weight or more, and particularly preferably 95% by weight or more. Preferably, 97% by weight or more is most preferable. When the ratio is less than 80% by weight, it may not be possible to satisfy all the required characteristics of excellent sedimentation property, low shear dispersibility, foam suppression property and defoaming property.

  The proportion of the D component in the nonvolatile content of the treatment agent of the present invention is not particularly limited, but is preferably less than 50% by weight, more preferably less than 20% by weight, and even more preferably less than 10% by weight.

  The treatment agent of the present invention does not contain a condensate of fatty acid and alkanolamine, or even when it is contained, the proportion of the condensate in the nonvolatile content of the treatment agent is preferably 5% by weight or less. If the ratio of the condensate is more than 5% by weight, the sedimentation property may be deteriorated. The proportion of the condensate is more preferably 3% by weight or less, further preferably 1% by weight or less, and particularly preferably 0% by weight.

  The treatment agent of the present invention is preferably an aqueous liquid containing water in which the aforementioned components are dispersed or emulsified. The water used in the present invention may be any of pure water, distilled water, purified water, soft water, ion exchange water, tap water and the like. In the case of an aqueous liquid containing water, the proportion of the nonvolatile content in the entire treatment agent is preferably 0.05 to 50% by weight, more preferably 0.5 to 40% by weight, and further preferably 1 to 30% by weight.

An organic solvent can be appropriately used in preparing the aqueous liquid of the treatment agent of the present invention.
The water emulsion in which the non-volatile content concentration of the treatment agent of the present invention is adjusted to 1% is preferably an emulsion that does not produce precipitates when heated to 40 ° C.

[Method for producing synthetic fiber treating agent for papermaking]
The processing agent of this invention can be manufactured by mixing A component, B component, and C component, and mixing another component as needed. The order of mixing the components is not particularly limited, and these components may be mixed at room temperature (20 to 25 ° C.), or may be mixed by heating (20 ° C. to 80 ° C.).
The form of component A includes an aqueous liquid, a paste, a powder, and a block, but an aqueous liquid is preferable from the viewpoint of handleability. The form of the component B includes an aqueous liquid, a powder form, a block form, and the like, but an aqueous liquid is preferable from the viewpoint of handleability. The form of component C includes an aqueous liquid, a powder form, a block form, and the like, but an aqueous liquid is preferable from the viewpoint of handleability. Therefore, the treatment agent of the present invention is preferably produced by mixing an aqueous liquid containing the component A, an aqueous liquid containing the component B, and an aqueous liquid containing the component C, and mixing other components as necessary.

As a density | concentration of the aqueous liquid containing A component, it is 10 to 40 weight%, for example, As a density | concentration of the aqueous liquid containing B component, it is 20 to 100 weight%, for example, as a density | concentration of the aqueous liquid containing C component, For example, 20 to 50% by weight.
Each component constituting the treatment agent of the present invention is dissolved in an aqueous solution (at least 10% by weight or more) in water at room temperature (20 to 25 ° C.) or as necessary (20 to 80 ° C.). It is a component that mixes to form a uniform and stable emulsion. Accordingly, in a manufacturing site where a treating agent is applied to a synthetic fiber, an aqueous liquid of each component can be dissolved or mixed at room temperature or heated to prepare a treating agent that is a stable emulsion.

  When handling, storing, transporting the raw materials for producing the treatment agent of the present invention, the product stability of the obtained treatment agent of the present invention is good even if the A component, B component, and C component coexist. No problem. In this case, it is possible to prepare an aqueous liquid having a concentration of 50% by weight or less as a high-concentration aqueous liquid. Of course, the A component, the B component, and the C component may be separated separately without mixing.

[Method for producing synthetic fiber for papermaking]
The manufacturing method of the synthetic fiber for papermaking of this invention includes the process of processing the processing agent of this invention to raw material synthetic fiber. Here, treating the treatment agent means applying the treatment agent. Moreover, raw material synthetic fiber means the synthetic fiber by which the processing agent is not processed. The synthetic fiber for papermaking means a short fiber cut into a predetermined length so that it can be used in the papermaking process. Since the synthetic fiber for papermaking obtained by the method for producing a synthetic fiber for papermaking of the present invention is a short fiber treated with the treatment agent of the present invention, it quickly settles in the papermaking process when producing papermaking, It is dispersed in water with a low share and bubbles are suppressed.

  (Raw material) The synthetic fiber is not particularly limited. For example, polyester fiber, polyamide fiber, polyolefin fiber, polyphenylene sulfide (PPS) fiber, polyacrylonitrile fiber, polypropylene fiber, or two or more of these polymers were used. A composite synthetic fiber etc. can be mentioned. Among these, it is preferable that the synthetic fiber is a polyester fiber in terms of high affinity between the treatment agent of the present invention and the fiber. The single yarn fineness of the fiber is preferably 0.01 to 2 dtex, and the fiber length is preferably 0.5 to 25 mm. It is particularly effective when applied to a polyester fiber for papermaking having a cut fiber length of 5 mm or more and a fineness of 1.0 denier or less. Polyester fiber means polyethylene terephthalate fiber, modified polyethylene terephthalate fiber copolymerized with polyethylene glycol or propylene glycol, polylactic acid (PLA) fiber, polytrimethylene terephthalate (PTT) fiber, polybutylene terephthalate (PBT). It means a fiber made of a polymer condensed by a reaction that forms an ester bond, such as fiber, polyethylene naphthalate (PEN) fiber, or polyarylate fiber.

  The process for treating the raw synthetic fiber with the treating agent of the present invention is not particularly limited as long as it is processed before the paper making process using the synthetic fiber for paper making. In general, synthetic fibers for papermaking (short fibers) are produced through a spinning process, a drawing process, a finishing process, a crimping process, and a cutting process. You may process by at least 1 process chosen from an extending process and a finishing process, and you may process in a crimping process and its front and back, a cutting process, and its front and back. There is no limitation in particular as a processing method (oil supply method), A well-known method is employable. For example, when processing in a spinning process, a drawing process, and a finishing process, it can be performed by a normal processing method (oil supply method) such as a roller touch method, a spray method, or a dipping method.

  The adhesion amount of the non-volatile content of the treatment agent of the present invention is preferably 0.05 to 2% by weight, more preferably 0.1 to 1% by weight, based on the synthetic fiber for papermaking. When the adhesion amount is less than 0.05% by weight, dispersibility may be insufficient, and when it exceeds 2% by weight, foaming in the dispersion tank may increase in the paper making process.

[Method for producing paper nonwoven fabric]
The manufacturing method of the papermaking nonwoven fabric of this invention includes the process (it may also be called a papermaking process) which disperse | distributes the synthetic fiber for papermaking processed with the processing agent of this invention in water. In the papermaking process, the synthetic fiber for papermaking is not easily entangled with each other during stirring and dispersion, quickly settles and disperses into single fibers, and has good stable dispersibility.
As the papermaking process, a conventional wet papermaking process can be employed. In the wet papermaking step, the papermaking synthetic fiber (short fiber) treated with the treatment agent of the present invention in the above step is put into a pulper, stirred and dispersed in water, and suspended. At this time, since it is dispersed in water with a low share and air bubbles are suppressed, paper making with a good texture can be obtained by uniformly dispersing the fibers. Next, the paper is supplied to a paper net and used as wet paper. And after the drying process which dries a wet paper, it winds up in roll shape and obtains a wet papermaking nonwoven fabric. The netting net is generally a circular net or a short net, but may be a long net, a rotoformer, a hydroformer, a perchformer, or the like. The drying process may be a plurality of rotary heating roller type (multi-cylinder type) or Yankee drum type.

  Moreover, the manufacturing method of the papermaking nonwoven fabric of this invention may disperse | distribute the synthetic fiber for papermaking in the water containing the processing agent of this invention at a papermaking process, and may make paper.

  In the method for producing a papermaking nonwoven fabric of the present invention, the synthetic fiber for papermaking treated with the treatment agent of the present invention quickly settles in water and disperses well with a low share, and the generation of bubbles in the papermaking process is suppressed. The Moreover, the said fiber disperse | distributes favorably. Therefore, not only the production speed is increased and the cost is reduced, but also a papermaking nonwoven fabric having a uniform and good texture can be obtained.

  The papermaking nonwoven fabric obtained by the production method of the present invention is used in various known fields. Particularly suitable as wipers, air filters, liquid filters, battery separators, artificial leather fabrics, disposable diapers, tea bags, and packaging materials.

  The present invention will be described below with reference to examples, but the present invention is not limited thereto. In addition, the evaluation items and the evaluation method in each example and comparative example are as follows. Hereinafter, “%” represents “% by weight”.

  The numerical values in Table 1 are the proportions of non-volatile components contained in the synthetic fiber treating agent for papermaking (components A1, A2 and A3 are obtained as respective aqueous dispersions as shown below, except for water. Further, the ratio of each nonvolatile content is shown in Table 1).

Each component described in Table 1 is as follows.
Component A1: A mixture of dimethyl terephthalate and dimethyl isophthalate in a molar ratio of 80:20, 25 parts by weight in total, 20 parts by weight of ethylene glycol and 55 parts by weight of polyethylene glycol monophenyl ether (average molecular weight: 3000), and a small amount as a catalyst Zinc acetate and titanium tetrabutoxide were added and reacted at 175 to 200 ° C. under atmospheric pressure for 180 minutes to distill off the theoretical amount of methanol to complete the transesterification reaction. Next, the temperature was raised to 230 ° C. and reacted for about 1 hour, and then the pressure was reduced to 0.5 mmHg and reacted at 230 to 260 ° C. for 20 minutes, followed by reaction at 0.1 to 0.5 mmHg at 275 ° C. for 40 minutes, The obtained polymer (average molecular weight 7000) was immediately added while stirring in warm water to obtain an aqueous dispersion of component A1. The concentration of component A1 in the obtained aqueous dispersion was 20% by weight.

  Component A2: Dimethyl terephthalate, dimethyl isophthalate, and dimethyl 5-sulfoisophthalate in a molar ratio of 75: 20: 5, a total of 25 parts by weight, ethylene glycol 10 parts by weight, diethylene glycol 20 parts by weight, and polyethylene glycol (average molecular weight 2000) 55 parts by weight A small amount of zinc acetate and titanium tetrabutoxide were added as a catalyst, and the mixture was reacted at 175 to 200 ° C. under atmospheric pressure for 180 minutes to distill off the theoretical amount of methanol, thereby completing the transesterification reaction. . Next, the temperature was raised to 230 ° C. and reacted for about 1 hour, and then the pressure was reduced to 0.5 mmHg and reacted at 230 to 260 ° C. for 20 minutes, followed by reaction at 0.1 to 0.5 mmHg at 275 ° C. for 40 minutes, The obtained polymer (average molecular weight 5000) was immediately added while stirring in warm water to obtain an aqueous dispersion of component A2. The concentration of component A2 in the obtained aqueous dispersion was 20% by weight.

  Component A3: Dimethyl terephthalate and dimethyl isophthalate in a molar ratio of 80:20 were mixed in a total of 28 parts by weight, 7 parts by weight of ethylene glycol and 65 parts by weight of polyethylene glycol monomethyl ether (average molecular weight: 1000). Zinc acetate and titanium tetrabutoxide were added and reacted at 175 to 200 ° C. under atmospheric pressure for 180 minutes to distill off the theoretical amount of methanol to complete the transesterification reaction. Next, the temperature was raised to 230 ° C. and reacted for about 1 hour, and then the pressure was reduced to 0.5 mmHg and reacted at 230 to 260 ° C. for 20 minutes, followed by reaction at 0.1 to 0.5 mmHg at 275 ° C. for 40 minutes, The obtained polymer (average molecular weight 7000) was immediately added while stirring in warm water to obtain an aqueous dispersion of component A3. The concentration of Component A3 in the obtained aqueous dispersion was 20% by weight.

Component B1-1: Polyoxyethylene (5 mol) octyl ether (pour point <0 ° C.)
Component B1-2: Polyoxyethylene (14 mol) oleyl ether (pour point 25 ° C.)
Component B1-3: Polyoxyethylene (13 mol) stearyl ether (pour point 35 ° C.)
Component B1-4: polyoxyethylene (10 mol) behenyl ether (pour point 50 ° C.)
Component B2-1: Polyoxyethylene (20 mol) sec-octyl ether (surface tension 34 mN / m)
Component B2-2: polyoxyethylene (7 mol) sec-dodecyl ether (surface tension 29 mN / m)
Component B2-3: polyoxyethylene (7 mol) sec-tridecyl ether (surface tension 29 mN / m)
Component B2-4: polyoxyethylene (16 mol) sec-docosyl ether (surface tension 37 mN / m)

In addition, the surface tension and pour point of component B were measured by the following methods.
<Surface tension>
A 1% by weight aqueous solution of each component was prepared and the temperature was adjusted to 20 ° C. 20 g of the aqueous solution was placed in a glass petri dish having an inner diameter of 60 cm and a depth of 15 mm, and the surface tension was measured with a surface tension meter (Kyowa CBVP surface tension meter A-3 type).
<Pour point>
A 45 ml sample was placed in a test tube and heated to 80 ° C. Next, the test tube was cooled and removed from the cooling bath every time the temperature decreased by 2.5 ° C., and the sample was gently tilted to visually determine whether the surface of the sample flows. The temperature at which the sample stopped moving for 5 seconds was read, and 2.5 ° C. was added to this value to determine the pour point.

Component C1: Potassium laurate component C2: Potassium oleate component C3: Sodium behenate component D1: Polyoxyethylene palmitic acid monoester (average molecular weight: 2500)

(Examples 1-20 and Comparative Examples 1-9)
(1) Preparation of emulsion Synthetic fibers for papermaking in Examples 1 to 20 and Comparative Examples 1 to 9 in which each component shown in Table 1 and water were mixed and the weight ratio of the non-volatile content in the entire treatment agent was 20% by weight. Each treatment agent was prepared. The obtained treating agent was diluted with water so that the weight ratio of non-volatile matter was 0.4% by weight with warm water of 25 to 60 ° C., respectively, to prepare an emulsion. In addition, the numerical value of Table 1 shows the weight ratio of each component which occupies for a non volatile matter.

(2) Polyethylene terephthalate short fibers for papermaking evaluation (test fibers)
In the production of the oiled cotton, the non-volatile content of the synthetic fiber treatment agent for papermaking to be evaluated is 0.1% of the fiber after the adhesion treatment with respect to 10 g of the raw fiber (polyethylene terephthalate short fiber having a fineness of 1.3 dtex and a length of 5 mm). The emulsion (5 g) prepared in (1) was attached by spraying so as to be 2% by weight, and dried in a hot air dryer at 80 ° C. for 1 hour. The polyethylene terephthalate short fibers (synthetic fibers for papermaking) obtained after drying were adjusted according to the following evaluation methods (3) to (7) after adjusting the temperature and humidity under the evaluation environmental conditions. The results are shown in Table 2.

(3) Sedimentation test 400 g of ion-exchanged water was collected in a 500 ml beaker, 1.00 g of test fiber was put therein, the time required for the fiber to completely settle in water was measured, and the sedimentation index It was.
<Criteria>
(Double-circle): A fiber sinks in water instantly.
○: Fiber sinks in water.
(Triangle | delta): Although a fiber sinks in water, there exists a fiber which is partially floating.
X: The fiber is not submerged and floats.

(4) Low shear dispersibility test 400 g of ion-exchanged water is collected in a 500 ml beaker, and 1.00 g of test fiber is put therein and stirred with a propeller stirrer (rotation speed 100 rpm) for 1 minute. After the stirring was stopped, the dispersion state of the fiber after 1 minute was visually determined according to the following criteria, and used as an index of low shear dispersibility of the fiber.
<Criteria>
A: Low shear dispersibility is very good, and fibers are uniformly dispersed.
○: Low shear dispersibility is good, but some fiber bundles are observed.
Δ: Low shear dispersibility is poor and many fiber bundles are observed.
X: Low shear dispersibility is poor, and remarkably many fiber bundles are observed.

(5) Foam suppression test 400 g of ion-exchanged water is collected in a 500 ml beaker, and 1.00 g of test fiber is put therein and stirred for 10 minutes with a propeller stirrer (rotation speed 1000 rpm). The foaming state after the stirring was stopped was visually determined according to the following criteria, and used as an index of foam suppression.
<Criteria>
(Double-circle): It is very favorable in the condition where there is no bubble.
◯: Good in a situation where the degree of foaming is very small and almost no foam is formed.
(Triangle | delta): It is inferior in the condition where foaming has generate | occur | produced.
X: Remarkably poor in a situation where foaming is intensely generated.

(6) Defoaming test 400 g of ion-exchanged water is collected in a 500 ml beaker, 1.00 g of test fiber is put therein, and the mixture is stirred for 10 minutes with a propeller stirrer (rotation speed: 1000 rpm). After the stirring is stopped, the mixture is again stirred for 1 minute with a propeller stirrer (rotation speed 100 rpm). After the stirring was stopped, the state of bubbles adhering to the fibers was visually determined according to the following criteria, and used as an index for defoaming.
<Criteria>
(Double-circle): It is very favorable in the situation where the bubble adhering to the fiber is not recognized at all.
○: Good in a situation where almost no bubbles attached to the fiber are observed.
(Triangle | delta): The bubble adhering to a fiber is recognized in part and is unsatisfactory.
X: The bubble adhering to a fiber is recognized clearly and it is remarkably bad.

(7) Dispersibility test 400 g of ion-exchanged water is collected in a 500 ml beaker, 1.00 g of test fiber is put therein, and the mixture is stirred for 10 minutes with a propeller stirrer (rotation speed: 1000 rpm). The dispersion state of the fibers after the stirring was stopped was visually determined according to the following criteria, and used as an index of dispersibility.
<Criteria>
A: Dispersibility is very good, and fibers are uniformly dispersed.
○: Dispersibility is good, but some fiber bundles are observed.
Δ: Dispersibility is poor and many fiber bundles are observed.
X: Dispersibility is poor, and remarkably many fiber bundles are observed.

  As can be seen from Table 2, the synthetic fiber bundle for papermaking to which the treatment agent of the present invention of Examples 1 to 20 was fed in comparison with the synthetic fiber for papermaking using the treatment agent of Comparative Examples 1 to 9 was a synthetic fiber bundle. In the paper-making process when producing paper from, it has excellent sedimentation and good dispersibility with a low share, so it disperses quickly into single fibers. Furthermore, since the foam suppressing property and defoaming property are good, the fiber has less foaming property and there are no bubbles adhering to the fiber, so that the stable dispersibility is also good. If the processing agent of this invention is provided, the synthetic fiber for papermaking suitable for the papermaking process in which the quality improvement and speeding-up of the papermaking nonwoven fabric are calculated | required can be obtained. Moreover, by using synthetic fibers for papermaking, a papermaking nonwoven fabric having a uniform and good texture can be obtained.

Claims (10)

Selected from at least one dicarboxylic acid (derivative) selected from aromatic dicarboxylic acids, aliphatic dicarboxylic acids having 4 to 22 carbon atoms, and ester-forming derivatives thereof, and alkylene glycol, polyalkylene glycol, and polyalkylene glycol derivatives. A component which is a polyester compound obtained by polycondensation of at least one selected from
At least one B component selected from the B1 component represented by the following chemical formula (1) and the B2 component represented by the following chemical formula (2);
A treatment agent containing a C component which is a fatty acid soap having 8 to 22 carbon atoms,
The ratio for the A component in the non-volatile content of the treatment agent is 20 to 85% by weight, the proportion for the B component is 10 to 60% by weight, and the proportion for the C component is 5 to 40% by weight. Fiber treatment agent.

(In the formula, R ¹ is a linear aliphatic hydrocarbon group having 7 to 21 carbon atoms. A is an alkylene group having 2 to 4 carbon atoms, and m is an integer of 2 to 100.)

(However, in the formula, R ² and R ³ are each independently an aliphatic hydrocarbon group having 1 to 20 carbon atoms, and the total number of carbon atoms of R ² and R ³ is 7 to 21. B is (It is a C2-C4 alkylene group, and n is an integer of 2-40.)   The processing agent according to claim 1, wherein the B component comprises the B1 component and the B2 component.   The processing agent of Claim 2 whose weight ratio (B1 / B2) of the said B1 component and the said B2 component is 80 / 20-20 / 80.   The processing agent in any one of Claims 1-3 whose pour point of the said component B1 is 15 degreeC or more.   The processing agent in any one of Claims 1-4 whose surface tension (20 degreeC) of the 1 weight% aqueous solution of the said component B2 is 25-32 mN / m. The A component is represented by the dicarboxylic acid (derivative), an alkylene glycol represented by the following chemical formula (3) and / or a polyalkylene glycol represented by the following general formula (4), and the following chemical formula (5). The processing agent according to claim 1, which is a polyester compound obtained by polycondensation of polyalkylene glycol or a derivative thereof.

(However, in the formula, R ⁴ is an aliphatic hydrocarbon group having 2 to 8 carbon atoms or an alicyclic hydrocarbon group having 2 to 8 carbon atoms.)

(In the formula, R ⁵ is an alkylene group having 2 to 4 carbon atoms, and p is an integer of 2 to 19).

(Wherein, R ⁶ is an alkylene group having 2 to 4 carbon atoms, q is an integer of 20 to 200, and R ⁷ is a hydrogen atom, an aliphatic hydrocarbon group or an aromatic group.)   The processing agent in any one of Claims 1-6 whose ratio of the sum total of A component, B component, and C component which occupies for the non volatile matter of the said processing agent is 80 weight% or more.   The treatment agent according to any one of claims 1 to 7, wherein the treatment agent is an aqueous liquid further containing water, and a ratio of a nonvolatile content in the entire treatment agent is 0.05 to 50% by weight.   The manufacturing method of the synthetic fiber for papermaking including the process of processing the processing agent in any one of Claims 1-8 to raw material synthetic fiber.   The manufacturing method of a papermaking nonwoven fabric including the process of disperse | distributing the synthetic fiber for papermaking in which the processing agent in any one of Claims 1-8 was processed in water.