JPH04146267A - Silk-like antistatic polyester and production thereof - Google Patents

Abstract

PURPOSE:To obtain the title polyester fiber by each using an aromatic polyester containing specific two components as a core component and an aromatic polyester containing a specific metal salt as a sheath component and subjecting the both components to conjugate spinning and then subjecting the spun yarn to alkali reduction treatment. CONSTITUTION:A core-sheath conjugate fiber obtained by each using an aromatic polyester containing 1-10wt.% polyoxyethylene based polymer expressed by formula I (Z is residue of an organic compound having 1-6 active hydrogens and <=300 molecular weight; R<1> is >=6C alkylene; R<2> is H or 1-40C monovalent hydrocarbon, etc.; k is 1-6; kXl is >=70; m is >=1) and having 5000-16000 molecular weight and 0.1-5wt.% organic metal salt as a core component and using an aromatic polyester containing 0.1-10wt.% organic sulfonic acid salt expressed by formula II (R is 3-30C alkyl, etc.; M is alkali metal) as a sheath component and subjecting the both components to conjugate spinning is subjected to alkali reduction treatment so that area conjugate ratio of core/sheath may be 5/95-50/50 to provide the silk-like antistatic polyester fiber having a stripe-like space oriented in axial direction of fiber and formed in the sheath part.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an antistatic polyester fiber exhibiting a net-like texture, and more specifically, exhibiting a dry feel characteristic of silk and being able to withstand low temperatures and
It has antistatic properties with excellent durability even under low humidity conditions, and when applying alkali weight loss treatment to give a net-like texture, even if there is a pressure-applied area before the weight loss process, that area will disappear after the weight loss and dyeing. This invention relates to polyester fibers that do not have defects such as appearing white.

<Prior Art> Polyester fibers have excellent physical properties and are therefore widely used in woven and knitted clothing. By treating the woven and knitted fabrics made of polyester fibers with improved yarn cross-sectional shape, additives in the fibers, heat shrinkability, etc. with alkali, we create textures such as fullness, drapability, and dry surface touch. It has become possible to improve the texture and obtain a net-like texture that is quite close to that of natural knitted fabrics.
9018). However, although it exhibits a net-like texture, it lacks antistatic properties, and there is a demand for polyester fibers that have antistatic properties and a net-like texture at the same time.

Conventionally, as a method of imparting antistatic properties to polyester fibers, polyoxyalkylene glyco-1, which is substantially incompatible with polyester, and polyoxyalkylene gellicol/polyamide block copolymers have been used.

A method is known in which a polyoxyalkylene glycol/polyester block copolymer, etc. is used, and an organic or inorganic ionic compound is further blended (for example, Japanese Patent Publication No. 44
-31828 Publication, Special Publication No. 60-11944,
JP-A-53-80497, JP-A-60-3941
Publication No. 3〉. However, when the antistatic polyester fiber obtained by such a method is subjected to alkali weight loss treatment, which is generally widely used to improve the texture of polyester fiber, the alkali necessary for developing a particularly silk-like texture is lost. When weight loss is applied at a weight loss rate of 20 weight 1% or more, there is a drawback that antistatic properties are easily lost in the subsequent dyeing process at a temperature of 120 to 135°C.

Furthermore, a method of localizing an antistatic agent consisting of polyoxyalkylene glycol and a metal sulfonate at a high concentration in the core component of the core-sheath type composite fiber to enable a high degree of alkaline weight loss treatment (for example, Bg61-6883 Publication 1 JP-A-55-122020, JP-A-61-28016
No. Publication> has been proposed. According to this method, it is possible to obtain antistatic polyester fibers with relatively excellent antistatic properties even when subjected to high alkali weight loss processing with a weight loss rate of about 25% by weight or more. However, it has drawbacks such as not being able to exhibit antistatic properties at low temperatures of less than about 20° C. or under low humidity conditions of less than 40% relative humidity. In addition, if there are any joints where pressure is applied before the weight loss process (e.g. pin marks, scratches, etc. created during processing steps such as weaving, knitting, scouring, presetting, etc. before the alkali weight loss process), the core component There are problems in which a part of the interface between the sheath component and the sheath component peels off, or the core component is intensively AXed and fibrillated during alkali reduction processing, resulting in the area appearing whitish when dyed.Hereinafter referred to as pressure loss whitening phenomenon. > is likely to occur. As the alkali weight loss rate increases, the net-like texture described above improves, but at the same time, there is a dilemma in that the pressure loss whitening phenomenon becomes more likely to occur. In addition, in order to suppress pressure loss whitening, it is necessary to reduce the amount of antistatic agent added to the core component to increase the adhesion at the interface between the core component and sheath component, or to increase the ratio of the sheath component to suppress fibrillation of the sheath component. However, with these methods, the expression of antistatic performance will be insufficient, and the antistatic durability such as washing durability, especially under low temperature and low humidity conditions, will be insufficient. Become something. In this way, pressure “loss whitening” and
The net-like texture and antistatic durability under low temperature and low humidity conditions were contradictory issues.

As mentioned above, it can exhibit antistatic properties even at low temperatures of less than about 20°C and low humidity conditions of less than 40% relative humidity, and has antistatic properties that exhibit a net-like texture, especially the dry feeling characteristic of silk. Polyester fibers have not yet been put to practical use.

<Purpose of the Invention> In view of the current situation, the present invention has been developed to provide anti-static properties with excellent durability even under low temperature and low humidity conditions, and which has been subjected to alkali weight reduction treatment to withstand harsh repeated washing treatments. It is an object of the present inventors to provide a net-like antistatic polyester fiber that does not suffer from the above-mentioned problem of pressure loss whitening even when imparting a net-like texture. We repeatedly investigated fiber structures using polyester blended with polyoxyethylene polyether.As a result,
The core of the core-sheath type composite fiber is made of a water-insoluble polyoxyethylene-based polyether having a specific molecular structure made water-insoluble by specifically copolymerizing ethylene oxide with a specific higher olefin oxide, and an organic metal salt. The above-mentioned pressure loss whitening phenomenon occurs because the sheath component is made of polyester blended with a specific organic sulfonate, and the composite fiber is subjected to alkali weight loss treatment. We have found that we can obtain an antistatic polyester fiber that exhibits antistatic properties even under low temperature and low humidity conditions, and exhibits a net-like texture, particularly a dry feel, thereby achieving the desired purpose.

That is, the present invention provides: 1. A core-sheath composite fiber in which the core-sheath components are both made of aromatic polyester, and the composite fiber-sheath portion has striped streak-like voids not arranged in the fiber axis direction by an alkali weight loss treatment. is present, and the core component contains (a) 1 to 10 polyoxyethylene polyethers that simultaneously satisfy the following (i) and (ii).
wt%, and (bl organometallic salt is present in 0.1 to 5 wt%, and the core/sheath area composite ratio is 5/95 to 501
50, (i) It is a non-random copolymerizable polyoxyethylene polyether represented by the maximum <I> below.

Z ((CH2CH20> 1 moR10-), R2
]k...(Engineering) [wherein, Z is an organic compound residue having a molecular weight of 300 or less having 1 to 6 active hydrogen atoms, R1 is an unsubstituted or substituted alkylene group having 6 or more carbon atoms, and R2 is a hydrogen atom , a monovalent hydrocarbon group having 1 to 40 carbon atoms or a monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6,
p represents an integer such that kX and Q are 70 or more, and m represents an integer of 1 or more. ] (ii) Average molecular weight is 5000 to 1600
Must be 0.

2. - 0.1 to 10% by weight of organic sulfonic acid metal salt represented by maximum R3O3M (R: alkyl group having 3 to 30 carbon atoms, aryl group having 7 to 40 carbon atoms, or alkylaryl group 1M; alkali metal) The aromatic polyester containing is used as a sheath component, and (a) 1 polyoxyethylene polyether that simultaneously satisfies the following (il and (ii)) is used.
~10% by weight and fb) Aromatic polyester containing 0.1 to 5% by weight of an organic metal salt is composite-spun as a core component, and then the obtained core-sheath type composite fiber is divided into core/sheath area composite ratios. 1. A method for producing a net-like antistatic polyester, which comprises subjecting it to an alkali weight loss treatment so that the ratio is 5/'95 to 50,150.

(i) It must be a non-random copolymerizable polyoxyethylene polyether represented by - maximum (1) below.

Z ((CH2CH20)s MORIO+-R2]
k...(1) [wherein, Z is a molecule having 1 to 6 active hydrogen atoms - 300 or less organic compound residues, R1 is an unsubstituted or substituted alkylene group having 6 or more carbon atoms, and R2 is a hydrogen atom , a monovalent hydrocarbon group having 1 to 40 carbon atoms or a monovalent acyl group having 2 to 40 carbon atoms, k is an integer of 1 to 6, ρ
kX and ll are integers of 70 or more, and m is an integer of 1 or more. ] (ii) Average molecular weight is 5000 to 1600
Must be 0.

It is.

The reason why the antistatic polyester fiber of the present invention exhibits excellent antistatic effect and durability even under low temperature and low humidity conditions is because the polyester that is the core component of the core-sheath composite fiber has hydrophilic properties. A high concentration of a specific water-insoluble polyoxyethylene polyether that has extremely excellent hygroscopicity, extremely low dissolution and elution properties in hot water, alkali-resistant aqueous solutions, washing water, etc., and excellent interfacial affinity with the polyester matrix. It is thought that this is produced as a result of localization and dispersion. Second, the sheath component itself has hydrophilic and hygroscopic properties by allowing the sheath component to have striped voids formed by subjecting the polyester containing an organic sulfonic acid metal salt to alkali weight reduction treatment. It is an effect. Thirdly, since the outside of the fiber and the core component of the core-sheath type composite fiber communicate with each other through the linear voids, the polyester core component absorbs moisture easily through these communicating holes. It is considered that The present invention was completed as a result of further repeated experiments based on this knowledge.

The aromatic polyester used as the base of the sheath and core in the present invention is an aromatic polyester having an aromatic ring in the chain unit of the polymer, and is composed of a difunctional aromatic dicarboxylic acid or an ester-forming derivative thereof and a diol or It is a polymer obtained by reaction with its ester-forming derivative. Specifically preferred aromatic polystyls include polyethylene terephthalate, polybutylene terephthalate, polyhexylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate.

Polyethylene-1,2-bis(phenoxy)ethane 44
In addition to '-dicarboxylate, copolymerized polyesters such as polyethylene isophthalate/terephthalate, polybutylene terephthalate/inphthalate, polybutylene terephthalate/decane dicarboxylate, etc. can be mentioned. Among these, particularly preferred are polyethylene terephthalate and polybutylene terephthalate, which have well-balanced mechanical properties and moldability.

Such aromatic polyesters can be synthesized by any method. For example, to explain polyethylene terephthalate, terephthalic acid and ethylene glycol are directly reacted, a lower alkyl ester of terephthalic acid such as dimethyl terephthalate and ethylene glycol are transesterified, or terephthalic acid and ethylene oxide are reacted. The first stage reaction is to produce a glycol ester of terephthalic acid and/or its low polymer, and the second stage is to conduct a polycondensation reaction by heating the product under reduced pressure until a desired degree of polymerization is achieved. It is easily produced by reaction. In addition, other thermoplastic polymers such as polyamides such as nylon-6, etc. may be added to the above polyester to the extent that the original physical properties of the polyester are not impaired.
It may also contain polyolefins such as polyethylene and polystyrene. Further, although it is preferable to use the same polyester for the sheath and core, different types of polyester may be combined as long as they have compatibility.

In the antistatic polyester fiber of the present invention, a water-insoluble polyoxyethylene polyether is blended with the aromatic polyester of the core.

In the present invention, water insolubility means that sample 5 is dissolved in 100 g of pure water.
g, stirred at 100°C for 60 minutes, allowed to cool to room temperature, and then subjected to natural filtration using JIS Standard Type 5 A filter paper, in which 90% by weight or more was filtered out.

Such water-insoluble polyoxyethylene polyethers include polyoxyethylene whose main chain is a polyoxyethylene block represented by the maximum (1) below, and whose molecular chain terminals are blocked with a specific oxyalkylene component. Polyether based polyethers are preferably used.

Z thousand (CH2CH20), MORIO-)-, R2]
k... (1) In the above formula, Z is a residue of an organic compound having 1 to 6 active hydrogen atoms, such as methanol, propatool 1-butanol, phenol, ethylene glycol, bisphenol A, propylene glycol butylene glycol, Neopentyl glycol glycerin, trimethylolpropane, triethanolamine, diglycerin,
Examples include residues of hydroxy group-containing compounds such as pentaerythritol and sorbitol, and residues of primary and secondary amines such as ethylenediamine, xamethylenediamine, and diethylenetriamine, among which hydroxyl groups with a molecular weight of 300 or less Base compounds are preferred.

R1 is the end of 6 or more carbon atoms! It is a substituted alkylene group or a substituted alkylene group, and among them, a substituted alkylene group having 6 to 50 carbon atoms is preferable, and among them, a substituted alkylene group having 6 to 50 carbon atoms is preferable.
-50 alkylethylene groups are more preferred. This R
Preferred specific examples of 1 include cyclohexylene group, phenylethylene group, hexylethylene group, methyl-pentylethylene group, heptylethylene group, methyl-hexylethylene group, and the like. Moreover, R1 may be a mixture of two or more of the above.

R2 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 40 carbon atoms, or a monovalent acyl group having 2 to 40 carbon atoms,
The hydrocarbon group is preferably an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkylaryl group or a hydroxyalkyl group. Further, the acyl group is an alkanoyl group.

Argenoyl group, cycloalkylcarbonyl group.

aryl group or allele group
A carbonyl group is preferred. k is an integer of 1 to 6 corresponding to the number of active hydrogen atoms that the organic compound that is the basis of Z has. g needs to be an integer such that kXJQ is 70 or more, and may be the same or different between or within molecules. When the value of kXρ is less than 70, the initial antistatic performance, hot water durability, and washing durability of the final polyester fiber will be insufficient. Also, k
Antistatic properties and durability improve as the value of Since it tends to be difficult to make ether insoluble in water, g is kX! It is preferable that the value of J is an integer of 300 or less. A more preferable range of kXρ is 80 to 200. m is an integer of 1 or more, and may be the same or different between or within molecules, but all m within the branches bonded to Z must be integers of 1 or more. When a branch in which m is ◯ exists, the antistatic durability of the polyester fiber finally obtained will be insufficient. The arrangement of CH2CH2O units and R'O units constituting such polyoxyethylene polyether is such that a polyoxyethylene block consisting of CH2CH2O units constitutes the main chain, and one R2O unit is located at the end of the polyoxyethylene molecular chain. Alternatively, it is necessary to take a localized arrangement by forming blocks of two or more units. By adopting such a specific structure, it is possible to make the polyoxyethylene polyether highly water-insolubilizable and highly hygroscopic by introducing a small amount of R2O units, and to achieve high antistatic properties and its Durability can be achieved. If the CH2CH2O units and R2O units are arranged randomly, the object of the present invention cannot be achieved.

The molecular weight of the water-insoluble polyoxyethylene polyether described above is in the range of 5,000 to 16,000. When the molecular weight is less than 5,000, it is difficult for the polyether to take the form of long enough streaks dispersed in the polyester fibers, resulting in insufficient initial antistatic performance, and no matter how much the RIO units are increased, the polyether It is difficult to prevent oxyethylene polyether from falling into hot water, hot alkali, washing water, etc., and the antistatic properties and durability of the polyester fibers ultimately obtained are insufficient.

When the molecular weight exceeds 16,000, the melt miscibility of the polyoxyethylene polyether in the aromatic polyester deteriorates rapidly, resulting in poor dispersibility, which not only makes spinning difficult, but also makes the resulting fibers difficult to obtain. The antistatic properties and physical properties will be poor, and the pressure loss whitening phenomenon described above will occur significantly, making it practically impossible to implement. Furthermore, as the molecular weight increases, antistatic properties under low temperature and low humidity conditions also become poor. This is presumed to be because the thermal movement of the polyoxyethylene-based polyether in the polyester matrix becomes smaller, so that the antistatic performance due to ion conduction decreases, especially at low temperatures. Among these, the preferred molecular weight range of the polyoxyethylene polyether is 5
500 to 14,000.

In addition, the water-insoluble polyoxyethylene polyether described above exhibits particularly excellent hydrophilic durability and excellent moldability when it has a specific hydrophilicity-hydrophobicity balance described below in addition to satisfying the above-mentioned requirements. In addition, when it is manufactured with high alkali weight loss treatment, its hydrophilic washing resistance is significantly improved.
The effect of reducing the rate of alkali weight loss, the effect of improving visual infection color, and the effect of improving abrasion resistance are remarkable, making it extremely useful in practice.

That is, it is preferable that the value α expressed by the following formula (n), which indicates the hydrophilic-hydrophobic balance of the water-insoluble polyoxyethylene polyether, satisfies the following conditions (1) or (2).

Condition ■ When k=1 0.4<α<30 Condition ■ k
= 2 to 6, α〈30 The molecular weight on the right side of (n) above represents the weight of the hydrophobic group in the polyoxyethylene polyether, and the denominator term represents the weight of the hydrophobic group in the polyoxyethylene polyether. Represents the weight of hydrophilic groups. Note that the denominator term 44 corresponds to the molecular weight of CH2CH2O units.

In the above conditions (■) and (2), if the value of the hydrophilicity-hydrophobicity relationship falls below the lower limit, the water durability of the antistatic polyester fiber will decrease, and the antistatic polyester fiber will be manufactured by subjecting it to an alkali weight loss treatment. If the antistatic performance deteriorates,
Washing durability of antistatic property tends to decrease.

Conversely, when the value of the hydrophilicity-hydrophobicity relationship exceeds the upper limit, the hydrophilicity of the polyoxyethylene polyether becomes insufficient, and the antistatic property, especially under low temperature and low humidity conditions, becomes insufficient. The antistatic properties at the bottom will decrease. Secondly, the miscibility between the polyoxyethylene polyether and the aromatic polyester deteriorates, and the interfacial affinity between the polyester matrix and the water-insoluble polyether dispersoid decreases, so pressure is not applied before weight reduction processing. If there are any areas where the dyed fabric is dyed, the fibers in those areas will become fibrillated due to weight loss, making the dyed fabric more likely to whiten. In addition, when the product is manufactured using a high alkali weight loss treatment, the visual density is low even if a sufficient amount of dye is applied, and the abrasion resistance is insufficient. will increase.

The preferred range of α is the range of conditions (1) and (2) below.

Condition■ When k=1 0.5<α<1.5Condition■
When k = 2 to 6, 0.24 < α < 1.5. The preferable lower limit value of the hydrophilicity-hydrophobicity relationship varies depending on the value of k. When k = 1, polyoxyethylene is the main Only one end of the chain is (R'O).

In contrast, when k = 2 to 6, all ends of the polyoxyethylene main chain are <R'O),
This is essentially related to the fact that it is blocked by components. Among the water-insoluble polyoxyethylene polyethers used in the present invention, those having a formula of 2 to 6 and in which all ends of the constituent polyoxyethylene main chain are blocked with a <Rio> component are particularly preferred.

Such polyoxyethylene polyether is produced by a first stage reaction in which an active hydrogen compound is reacted with ethylene oxide,
Next, the product is synthesized by a second stage reaction in which the product is reacted with an olefin oxide having 6 or more carbon atoms, and optionally a third stage reaction in which the hydroxyl end group of the product is capped with a hydrocarbon group or an acyl group. I can do it.

Such olefin oxides include nonene oxide, cyclohexene oxide, olefin oxide having 1 carbon atom, among others.
Particularly preferred are α-olefin oxides having a molecular weight of 2 to 40.

Particularly preferred specific examples of the above polyoxyethylene glycol polyether are shown in Table 1 (In the table, the alkyl side chain of R10 is a mixture of the alkyl groups shown in parentheses, and the average value is show.).

Specific examples of R2 other than H in the compounds shown in Table 1 include R2= CH3, C6Hs, CH2C6
R5, Cl2H25, Cl8H37, C engineering 8H351C
1□H23CO, C17H33CO, C engineering vH15c.

etc. are preferred. Such polyoxyethylene polyethers may be used alone or in combination of two or more.

The blending amount of such polyoxyethylene polyether is
The amount is in the range of 1 to 10% by weight, preferably 2 to 10% by weight, based on the aromatic polyester constituting the core component of the core-sheath composite fiber.
It is in the range of 7% by weight. When the amount is less than 1% by weight, sufficient antistatic properties cannot be obtained. On the other hand, when the blending amount exceeds 10% by weight, the antistatic properties of the final polyester fibers no longer show any significant improvement, and the mechanical properties, heat resistance, and light resistance of the resulting fibers are likely to be impaired. In addition, the rate of alkali weight loss and the color of the photoinfection.

Pressure loss, whitening properties, etc. all deteriorate.

In the present invention, an organic metal salt is used in combination with the above-mentioned polyoxyethylene polyether. The organic metal salts mentioned here are dodecylbenzenesulfonic acid and tridecylbenzenesulfonic acid.

Sodium distearyl phosphate, an alkali metal salt of sulfonic acid formed from a sulfonic acid such as nonylbenzenesulfonic acid, dibutylnaphthalenesulfonic acid, hexadecylsulfonic acid, dodecylsulfonic acid, and an alkali metal such as sodium, potassium, or lithium. These include alkali metal salts of phosphoric acid, such as alkali metal salts of phosphoric acid, and alkali metal salts of other organic carboxylic acids. Further, preferred examples of the sulfonic acid metal salts include those shown below.

R'O(R' O), (CH2) b
SO+ M (wherein R' is a monovalent hydrocarbon group, R' is an alkylene group having 2 to 4 carbon atoms, a is an integer of 1 to 100, b is an integer of 2 to 4, M is Na, K , alkali metal salts such as Li), among others, sodium dodecylbenzenesulfonate, a mixture of sodium alkylsulfonates with an average number of carbon atoms of 14, Cl2H250(CH2CH20)i CH2CH2
SO3Na.

C16H330<CFbCR20) 23CH2CH
Metal salts of sulfonic acids such as 2CH2S03Na are good.

Such organic metal salts may be used alone or in combination of two or more. The blending amount thereof is in the range of 0.1 to 5% by weight, preferably in the range of 0.1 to 3% by weight, based on the aromatic polyester constituting the core component of the core-sheath composite fiber. When this amount is less than 0.11% by weight, sufficient antistatic properties cannot be imparted, and even if this amount is increased beyond 5% by weight, the antistatic properties are no longer significantly improved, and the core The alkali weight loss rate, optic infection color, pressure loss whitening property, etc. of the sheath type composite fibers become worse.

In the antistatic polyester fiber of the present invention, streak-like voids are present on the surface of the sheath component of the core-sheath type composite fiber in a striped manner in the fiber axis direction. Such streak-like voids are uniformly scattered throughout the cross section of the sheath component. If the streak-like voids are concentrated near the surface of the sheath component or are not uniformly scattered, they are likely to form fibrils, resulting in a significant decrease in strength.
The hydrophilicity and hygroscopicity of the sheath component become insufficient. Also,
Due to the presence of striped voids in the fiber axial direction on the surface of the fiber sheath component, woven and knitted fabrics made of this fiber have a silk T! I! It has a texture. Furthermore, the striped voids communicate with each other, and the outside of the fiber and the core component of the core-sheath composite fiber communicate with each other through the striped voids, so the polyester core component absorbs moisture through these communicating holes. The antistatic effect under low temperature and low humidity conditions is greatly improved compared to when the sheath component does not have streaky voids. Also, unexpectedly, when an organic sulfonic acid metal salt is added to the polyester of the sheath component, the above-mentioned pressure loss whitening phenomenon is significantly improved compared to the case where it is not added. Although the reason for this improvement effect is not clear, it is thought that it is because the interfacial adhesion between the core component and the sheath component is improved by adding the organic sulfonic acid metal salt to the polyester of the sheath component.

In order to cause such streak-like voids to exist in the sheath component, - maximum R3O3M must be added to the aromatic polyester of the sheath component.
(R: Alkyl group with 3 to 30 carbon atoms or 7 to 3 carbon atoms
Adding an organic sulfonic acid metal salt represented by 40 aryl group or alkylaryl group, M: alkali metal),
It can be easily obtained by making fibers or woven or knitted fabrics and then eluting at least a portion of the sulfonic acid metal salt by treatment with an alkali. - The organic sulfonic acid metal salt represented by the maximum R303M has the same structure when added to the core component, and preferred specific examples of such organic sulfonic acid metal salt include sodium stearyl sulfonate, sodium octylsulfonate, Examples include sodium dodecylsulfonate and a mixture of sodium alkylsulfonates having an average number of carbon atoms of 14. Such organic sulfonic acid metal salts may be used alone or in combination of two or more thereof.

The amount of the organic sulfonic acid metal salt added to the aromatic polyester as a sheath component is preferably in the range of 0.11 to 10% by weight based on the aromatic polyester as a sheath component. If this amount is less than 0.1% by weight, even if the organic sulfonic acid metal salt is eluted and removed by alkali treatment, streak-like voids uniformly scattered throughout the cross section of the sheath component of the resulting fiber cannot be created. It disappears, and you can no longer get a net-like dry feeling.

In addition, the communication between the outside of the fiber and the core component of the core-sheath type composite fiber due to the streaky voids becomes smaller, and the moisture absorption of the core component polyester decreases, so the antistatic effect is insufficient under low temperature and low humidity conditions. It's easy to become something. - On the other hand, if the blending amount exceeds 10 parts by weight, the fibers of the present invention produced by the alkali reduction treatment will have a decreased visual color property, even after dyeing with a sufficient amount of dye. The concentration is low, and the sheath component of the fibers tends to fibrillate, causing discoloration of worn areas, lowering strength, and impairing mechanical properties. Furthermore, if there is a part where pressure is applied before the weight loss process, the polyester of the sheath component itself becomes fibrillated due to the weight loss, and the above-mentioned pressure loss whitening phenomenon becomes worse.

Note that antioxidants, heat stabilizers, ultraviolet absorbers, etc. may be added to the aromatic polyester as the core component and sheath component of the antistatic polyester fiber of the present invention, and it is preferable to do so. be.

In addition, flame retardant, optical brightener, matting agent 1 as necessary
Colorants, inert fine particles, and other optional additives may be added.

Antioxidants are used at high temperatures during the fiber melt-spinning process, etc.
It is possible to suppress the thermal decomposition of the polyoxyethylene polyether polymer caused by low discharge speed and long residence time, and to prevent the occurrence of water solubility and deterioration of alkali durability. The type of antioxidant used in the present invention is not limited as long as it has antioxidant ability. Preferred antioxidants used in the present invention include hindered phenol compounds.

Examples include thiopropionate compounds and phosphite compounds, and one type may be used alone or two or more types may be used in combination. Further, the amount of antioxidant added is preferably in the range of 0.02 to 3% by weight based on the aromatic polyester. When this amount is less than 0.02% by weight, the thermal decomposition inhibiting effect on the polyoxyethylene polyether polymer is insufficient, and even if it is more than 3% by weight, the thermal decomposition inhibiting effect is insufficient. The effect is saturated and no further improvement is observed, and on the contrary, the mechanical properties, hue, etc. of the composite fiber are impaired.

In producing the antistatic polyester fiber of the present invention,
The core component is aromatic polyester, water-insoluble polyoxyethylene polyether, and organic metal salt.

Any method can be adopted as a method for blending an antioxidant, etc., and a method for blending an organic sulfonic acid metal salt, an antioxidant, etc. into the aromatic polyester of the sheath component, and the above components may be added simultaneously or optionally. They can be separately blended into the aromatic polyester in this order. That is, at any stage until the spinning of polyester fibers is completed, for example, 5 before the start of the polycondensation reaction of aromatic polyester, 1 in the middle of the polycondensation reaction,
The resin and the additive components may be melt-mixed in advance and added in a single operation at the time when the polycondensation reaction is completed and still in a molten state, in the powder state, or in the spinning stage, or 2. It may be added in portions or more, or each additive component may be separately blended into the aromatic polyester in advance and then mixed before spinning. Furthermore, when adding additional components before the middle stage of the polycondensation reaction, they may be added after being dissolved or dispersed in a solvent such as glycol.

In addition, in the antistatic polyester fiber of the present invention, the core/sheath area composite ratio of the alkali-reduced core-sheath type composite fiber is 5/
Must be in the range of 95-50150. When the area composite ratio of the core 7 and the sheath exceeds 50,150, the polyester portion constituting the sheath becomes thin, resulting in poor physical properties such as strength, fibril resistance, and heat resistance, as well as poor antistatic properties and The washing durability and the color vividness and fastness of the dyed product become insufficient, making it impractical. On the other hand, when the core/sheath area composite ratio is less than 5/95, the effect of the polyoxyethylene polyether and ionic compound blended into the core of the polyester fiber is not fully exhibited, and the antistatic property is lowered. , the antistatic properties are poor, especially under low temperature and low humidity conditions.

The external shape of the antistatic polyester fiber of the present invention and the shape of the core component affect the electrical properties, tension, and elasticity of the woven or knitted fabric.

It can take any shape depending on the purpose of texture, gloss, etc. For example, in addition to circular cross section, triangular, 4! ! flat.

Examples of irregular cross-sections include square, triangular, star-shaped, hexagonal, V-shaped, and C-shaped. It is preferable to have an irregular cross section in order to obtain a net-like texture such as fullness, drapability, and elasticity. Further, although the outer shape and the shape of the core portion may be different shapes, it is preferable that the core component and the sheath component are substantially concentric, that is, the core component and the sheath component are not eccentric by 20% or more. If it is extremely biased or the core component is exposed on the surface, the intended effects of the present invention cannot be achieved. In order to ensure performance against fibrillation, abrasion and pressure loss whitening of the sheath component, as well as a dry net-like texture due to the striated voids on the sheath surface, the thickness of the thinnest part of the sheath component after alkali reduction must be adjusted. It is desirable that the thickness be 1 μm or more, more preferably 2 μm or more.

The antistatic polyester fiber of the present invention is produced by using a conventionally known composite spinning device, and the aromatic polyester added with the above-mentioned organic sulfonic acid metal salt is added to the sheath side, and the water-insoluble polyoxyethylene polyether and organic By using an aromatic polyester blended with a metal salt, it can be produced under any desired spinning conditions without any problems. For example 500-25
A method of melt spinning at a speed of 00 m/min, stretching and heat treatment, a method of melt spinning at a speed of 1,500 to 5,000 rr5z'' minutes, and performing stretching and false twisting simultaneously or sequentially; 5
Any spinning conditions can be employed, such as melt spinning at a high speed of 000 m for 7 minutes or more and omitting the stretching step depending on the application. The obtained fibers or woven or knitted fabrics made from these fibers are heat-treated at a temperature of 100° C. or higher to stabilize the structure and to obtain the polyoxyethylene polyether contained in the fibers.

It is also preferable to promote proper arrangement by migration of the organic metal salt and various additives contained as necessary. Furthermore, relaxation heat treatment or the like can be used in combination, if necessary. In addition, the use of a blended yarn of the fibers obtained as described above and fibers with different heat shrinkability, single fiber fineness, and cross-sectional shape creates a net-like texture such as fullness, drapability, and resilience. This is also preferable for obtaining the desired results.

The composite fiber obtained as described above is treated with an aqueous solution of an alkaline compound to elute and remove at least a portion of the organic sulfonic acid metal salt contained in the sheath component, thereby forming a fiber axis on the surface of the sheath component. It is possible to obtain polyester fibers which are oriented in the direction f and have striped striped voids. As the alkaline compound, sodium hydroxide, potassium hydroxide, etc. are used, and the concentration of the alkaline compound can be arbitrarily selected. The treatment with the alkaline compound is preferably carried out during the dyeing and finishing process after the above-mentioned fibers are used to form a woven or knitted fabric.

Further, if necessary, the antistatic polyester fiber of the present invention or the woven or knitted fabric produced from this fiber may be subjected to a process after making the continuous chamber hydrophilic. This post-hydrophilic treatment includes, for example, a method of treatment with an aqueous dispersion of a polyester polyether block copolymer consisting of terephthalic acid and/or isophthalic acid or their lower alkyl esters, lower alkylene glycol, and polyalkylene glycol. Alternatively, a method in which a hydrophilic monomer such as acrylic acid or methacrylic acid is graft-polymerized and then converted into a sodium salt can be preferably employed.

<Effects of the Invention> The antistatic polyester fiber of the present invention has striped voids on the fiber surface, so it exhibits a dry feel very similar to silk, and at the same time is resistant to low temperature and low humidity conditions. However, it has sufficient antistatic properties, and can exhibit antistatic properties even in low temperature or dry environments, making it extremely useful. Furthermore, this antistatic performance is not affected by repeated washing treatments. Furthermore, even when the product is manufactured using a high alkali weight loss treatment with a weight loss rate of 25%, there is very little deterioration in photoinfection color and fibril resistance, and there are still areas where pressure is applied before the sterilization process. Also, the problem of whitening of the dyed fabric due to fibrillation of the fibers in that area due to weight loss does not occur. Therefore, it can be used not only in fields such as women's innerwear such as lingerie, linings, and unlined clothing, but also as an antistatic outer material that requires a high degree of hand improvement by alkali weight loss treatment.

<Examples> In order to explain the present invention more specifically, Examples will be described below, but the present invention is not limited to these Examples. Note that parts and % in Examples and Comparative Examples indicate parts by weight and % by weight, respectively. In addition, the frictional charging voltage, photoinfection color property, fibril resistance, pressure loss whitening resistance, and dry feel and cool feeling of the fabric of the silk fabric made of the obtained polyester fibers were measured using the following methods.
1) Frictional charging voltage of dyed knitted fabrics i) Equipment and materials Rotating drum type frictional charging voltage measuring device (rotary static tester), oscilloscope, friction cloth: Cotton broad 30/' - scouring, bleaching, glue-free finishing ii) Adjustment of test pieces Rolling type: 3.8an x 30an Now wrapping type: 4.0■ x 8.0α Collect 3 pieces vertically from each. Furthermore, three pieces of cotton broadcloth (30,/-) of friction cloth were collected in a lengthwise direction of 2.51×14.

1ii) Test operation - Humidity control: Leave in a desigator at 40±2% RH or 30=2% RH for at least one day and night.

■Atmosphere of measurement room: 40℃ 2%RH (20±2℃), 3
0±2%RH (10±2℃) ■Sample: 1 stacked sheet ■Drum rotation speed: 700r, p, m C charging equilibrium time - 1 minute ■Contact pressure load: 600g Rotary with one test piece facing up Attach it to the rotating drum of the stick tester, and attach a piece of friction cloth to the clips at both ends of the bottom in a balanced manner at the position where it contacts the test piece.
Apply a load of 0 g.

The recorder (5an, 7 minutes) is operated on the oscilloscope source, and the frictional charging voltage (V) is measured when the charging balance is reached.
Read the extreme value and -) and express it as the average value of the three sheets (
(up to 10 integer values).

The relationship between the antistatic effect and the frictional charging voltage shows that the antistatic effect is good if the frictional charging voltage is 1500V or less.

Further, the washing treatment for examining the washing resistance of antistatic properties was as follows.

(Washing process) Using a household washing machine, use New Enzyme Sub (manufactured on the left) 2 g /
, Q solution (30Q<bath ratio 1:30), add the sample, and wash with an automatic swirling water stream at 40°C for 10 minutes.

After that, dehydrate with 40℃ warm water 30ρ (bath ratio 1:30)
Wash with hot water for 5 minutes, dehydrate, then rinse with overflow water for 1 minute.
This was done for 0 minutes to dehydrate. Repeat this 30 times and wash 3
Perform 0-time processing (referred to as L30).

(2) 3 50 denier/24 filament colored polyester fibers for dyed fabric
After scouring and presetting the stockinette fabric knitted with the main yarns by a conventional method, alkali weight loss treatment was performed at boiling temperature with a 30 g/fJ sodium hydroxide aqueous solution to reduce the alkali weight loss rate to 2.
Sumikalon Navy B with 5% Shine knitted fabric
lue S-2GL (manufactured by Sumitomo Chemical) 4% owf,
Disper VG (manufactured by Meisei Chemical Industry) 0.5f! /ρ and acetic acid 0.3 g/(J) after dyeing at 130°C for 60 minutes at a bath ratio of 1;50, sodium hydroxide 1 g/ρ
and hydrosulfide Ig/Jl! Dyed knitted fabric A
(N rate 25%) was obtained. The L° value (lightness index) of the weight loss dyed knitted fabric was measured using Macbeth MS-2020 (Instrument
Ai Color System (manufactured by Limlted) is used for measurement. The smaller the L8 value, the higher the visual density and the better the visual infection color.

(3) Fibril resistance of weight loss dyed knitted fabric The above weight loss dyed knitted fabric A was fabricated using a Gakushin type flat abrasion machine for rubbing fastness testing, using georgette made of 100% polyethylene terephthalate as the friction cloth. The surface was abraded 200 times under a load of 500 g, and the degree of discoloration was determined using a gray gel for discoloration and fading. If the abrasion resistance (fibril resistance) is extremely low, it will be grade 1, and if it is extremely high, it will be grade 5. For practical purposes, a grade 4 or above is required.

(4) Pressure whitening resistance of weight loss dyed knitted fabric A stockinette knitted fabric is scoured and preset using a conventional method, and passed through calender rolls with a pressure of 20 dazzles/-, and then processed in the same manner as above. Weight loss dyed knitted fabric B is subjected to alkaline weight loss, dyeing, and final set treatments with an N rate of 25%.
I got it. The L° value (lightness index) of weight loss dyed knitted fabric A and weight loss dyed knitted fabric B was measured using Macbeth MS-2020 (Instrum
EnterColor System (manufactured by Lim1ted) was used for measurement, and the difference in L° value (ΔL”) between the two was
The degree of pressure whitening resistance was evaluated.

ΔL''=L' (knitted fabric B) - L'' (knitted fabric A) The smaller the ΔL° value, the better the pressure whitening resistance of the weight loss dyed fabric is.

(5) Drapability and cool feel of the fabric Polyester fiber 50 denier/24 filament 3
007/m twisted yarn with warp density 4 as warp and warp yarns
3 lines/am, latitude density 40 lines/a! Weave plain weave with l,
Next, the gray fabric is refined and preset according to conventional methods,
Thereafter, the weight was reduced by 25% with a 30 g/D sodium hydroxide aqueous solution at boiling temperature, and finished by dyeing and final setting in the same manner as above. The dryness and coolness of the resulting fabrics were compared by 10 panelists.

Examples 1 to 9 and Comparative Example 1 100 parts of dimethyl terephthalate, 6 parts of ethylene glycol
0 parts, 0.06 parts of calcium acetate monohydrate (0.066 mol % based on dimethyl terephthalate) and 0.009 parts of cobalt acetate tetrahydrate (0.007 mol based on dimethyl terephthalate) as a coloring agent. %) in a transesterification tank and heated from 140℃ to 22℃ for 14 hours in a nitrogen gas atmosphere.
The transesterification reaction was carried out while raising the temperature to 0 and distilling the generated methanol out of the system.

After completion of the transesterification reaction, 0.058 part of trimethyl phosphate (o, oso mol% relative to dimethyl terephthalate) as a stabilizer and 0.024 part of dimethylpolysiloxane as an antifoaming agent were added to the reaction mixture.

Then, after 10 minutes, 0.04 parts of antimony trioxide (0.027 mol % based on dimethyl terephthalate) was added,
240 while simultaneously expelling excess ethylene glycol.
After raising the temperature to ℃, it was transferred to a polymerization reactor. Next, this reaction mixture is added to the following chemical formula % formula % (where m is 3 as an average value and p is 111 as an average value).
, j is an integer from 18 to 28 with an average of 21), the average molecule is 16930, and the hydrophilicity-hydrophobicity relationship value is 0.
．． 42 water-insoluble polyoxyethylene compound (Nα1 in Table 1) was added in the amount listed in Table 2, and the pressure inside the reaction vessel was increased from 760 Hg to 3 mmH over 1 hour.
The pressure was reduced to 3 mmHg, and 10 minutes after the degree of pressure reduction reached 3 mmHg, sodium dodecylbenzenesulfonate as an organic metal salt was added under reduced pressure in the amount shown in Table 2. The pressure was further reduced to 1 part wnHg, and at the same time the temperature of the reaction mixture was raised from 240°C to 280'C over 1 hour and 30 minutes. Under reduced pressure of lmmHg or less, polymerization temperature 280°C
Polymerization was continued for another 2 hours, and at this stage 0.1 part of Cyanox 1790 (manufactured by American Cyanamid Co., Ltd.) and Mark AO-412 were added to the reaction mixture as antioxidants.
3 (manufactured by Adeka Argus Chemical Co., Ltd.) was added under reduced pressure, and then polymerized for another 30 minutes. The intrinsic viscosity of the obtained polymer was in the range of 0.645 to 0.655, and the softening point was 260. -263°C.This polymer was made into chips by a conventional method.The aromatic polyester containing a water-insoluble polyoxyethylene compound thus obtained was used as a core polymer, and after drying by a conventional method, it was molded into a screw mold. It is melted in an extruder and fed to a binary composite spinning head via a gear pump.

On the other hand, as a polymer for the sheath component, a mixture of sodium alkyl sulfonate having 8 to 20 carbon atoms and an average number of 14 carbon atoms was added in the amount shown in Table 2, and the intrinsic viscosity was 0.
．． No. 64 polyethylene terephthalate chips were dried in a conventional manner, then melted in a screw extruder, and similarly fed to the composite spinning head.

The supply amount of polymer for core component and water reamer for sheath component is 25
The area ratio of the core component after the % alkali weight loss was set to be the value shown in Table 2. The molten polymers of the pulp component and the sheath component that were supplied at the same time were processed using a composite spinneret with 24 composite spinning holes having a square cross-sectional shape for both the core and sheath.
After extrusion at 5℃, 1500m through Godetstrol.
It was once wound up at a speed of ,/min. Next, the drawn yarn was subjected to a drawing heat treatment using a heating roller at 90° C. and a drawing heater at 170° C. at a drawing ratio such that the elongation of the obtained drawn yarn was 35%, thereby obtaining a drawn yarn of 50 denier/24 filaments.

In addition, polyethylene terephthalate chips with an intrinsic viscosity of 0.64 are used as the polymer for the core component, and the number of carbon atoms is 8 to 2.
Intrinsic viscosity 0.64 with addition of 1.2% mixture of sodium alkyl sulfonates having an average number of carbon atoms of 14
Except for using polyethylene terephthalate chips of
Composite spinning and drawing were performed in exactly the same manner as in Example 4 to obtain a drawn yarn of Comparative Example 1.

The obtained drawn yarn was made into a knitted fabric, which was scoured, preset, and reduced in alkali weight by 25% by the method described above.

For the dyed and final-set dyed knitted fabric A, measure the visual infection color property, fibril resistance, and frictional electrostatic voltage after 0 washings (referred to as LQ) and after washing 30 times (referred to as L30). Furthermore, pressure loss whitening resistance was measured for the dyed knitted fabric B which had been scoured, preset, pressure treated with a calendar, 25% alkali weight loss, dyed, and final set. Additionally, the dry feel and cool feel of the fabric were evaluated. The results of Examples 1 to 9 are shown in Table 2, and the results of Comparative Example 1 are shown in Table 3.

The woven or knitted fabric made from the obtained antistatic polyester fiber has a weight of 10
It has sufficient antistatic properties even under low temperature and low humidity conditions such as °C and 230% RH, and its antistatic properties are not affected by washing, and its photoinfection color and #4 fibrillarity are also good. Ta. Moreover, even if there are areas under pressure before the weight loss process, the fibers in those areas will become fibrillated due to weight loss and the dyed fabric will not whiten, resulting in an excellent net-like dry feel and cool surface touch. It was something.

Examples 10-12 The same operation as in Example 5 was performed. However, as the water-insoluble polyoxyethylene polyether, do not use one having the chemical formula below.

HO-(CH2H20-) m-<CH2CH2
0-).

CH2CH2 (CH2CH2~), -H CJ H2J +1 However, in Example 10, m is 3 as an average value, and p
is an average value of 181, j is an integer from 18 to 28 and has an average of 21, a water-insoluble polyoxyethylene polyether with an average molecular weight of 10010 and a hydrophilicity-hydrophobicity relational value of 0.26. , 6>, Example 11
, m is an average value of 10, p is an average value of 180, and j is an integer from 14 to 16 with an average of 15.
Average molecule 113018, value of hydrophilic-hydrophobic equation
In Example 12, m is 10 as an average value, and p is 1 as an average value.
15, j is an integer from 18 to 28 with an average of 21, average molecular weight 11838, value of hydrophilicity-hydrophobicity relationship 1°3
No. 5 water-insoluble polyoxyethylene polyether (first
No. 16> in the table was used. The results are shown in Table 2. Comparative Example 2 The same operation as in Example 4 was performed. However, water-soluble polyoxyethylene glycol having an average molecular weight of 20,000 was used instead of water-insoluble polyoxyethylene polyether. The results are shown in Table 3.

The resulting polyester fibers are slightly inferior in antistatic durability and photoinfection color under low temperature and low humidity conditions, and weight loss dyed fabrics that are subjected to pressure before weight loss processing become slightly white, and the cool feel of the fabrics is slightly affected. It was inferior. It was observed that the sides of the fibers of the weight loss dyed fabric subjected to pressure were partially fibrillated, and the pressure loss whitening resistance was poor.

Comparative Examples 3-6 The same operations as in Examples 1-9 were performed. However, water-insoluble polyoxyethylene compounds (No1 in Table 1) and sodium dodecylbenzenesulfonate (ionic compounds)
The amount of addition of the polyester listed in Table 3 is used as the polymer for the core component, and the amount of supply of the polymer for the core component and the polymer for the sheath component is set so that the area ratio of the core component after 25% alkali reduction is the value listed in Table 3. Set it so that The results are shown in Table 3.

Comparative Example 3, in which the core component area ratio exceeded 50%, had poor fibril resistance, and those subjected to pressure before weight loss processing slightly whitened, resulting in poor pressure loss whitening resistance. On the other hand, Comparative Example 6 in which the core component area ratio was less than 5% had poor antistatic durability under low temperature and low humidity conditions. Comparative Example 4, which used polyethylene terephthalate chips to which no sodium alkylsulfonate was added as the sheath component polymer, had poor dry feel and coolness of the fabric. - way,
Comparative Example 5, which used polyethylene terephthalate chips to which 6.0% of a mixture of sodium alkyl sulfonates having 8 to 20 carbon atoms and an average number of carbon atoms of 14 was added, had poor fibril resistance and poor pressure loss whitening resistance. It was slightly inferior.

Comparative Example 7 The same operation as in Example 5 was performed. However, as the water-insoluble polyoxyethylene polyether, one having the following chemical formula was used.

CH3 HO-C-CH20-(CHCH20-) ,,,-(
CH2CH20-) pcH3CJ H2J+1 However, m is 2 as an average value, p is 70 as an average value, j
is an integer from 24 to 30 with an average of 26 and an average molecular weight of 48
74, a water-insoluble polyoxyethylene polyether having a hydrophilicity-hydrophobicity relationship value of 0.59 was used.

The results are shown in Table 3. Since the molecular weight of the water-insoluble polyoxyethylene polyether was less than 5,000, the hydrophilic durability was insufficient and the antistatic durability was poor.

Comparative Examples 8-9 The same operation as in Example 5 was performed. However, as the water-insoluble polyoxyethylene polyether, one having the following chemical formula was used.

HO-(CHCH20->ff1 CjH2”+1 (CH2CH20-).

(CH2CH2-).

CH2CH2 However, in Comparative Example 8, m is an average value of 6, p is an average value of 350, j is an integer from 18 to 28 and an average of 21, the average molecular weight is 19474, and the value of the hydrophilicity-hydrophobicity relationship is 0. In Comparative Example 9, m is 8 as an average value, p is 270 as an average value, and j is 18 to 28.
A water-insoluble polyoxyethylene polyether having an average molecular weight of 17,306 and a hydrophilicity-hydrophobicity relationship of 0.46 was used.

The results are shown in Table 3.

In Comparative Examples 9 and 10 in which the molecular weight of the water-insoluble polyoxyethylene polyether exceeds 16,000, the polyoxyethylene polyether is easily thermally decomposed during melt spinning and has low miscibility with the aromatic polyester. For,
The hydrophilic durability was insufficient, the antistatic durability was poor, and the visual staining property was also poor. In addition, due to its large molecular weight, it
Antistatic durability under low humidity conditions was also poor.

Claims (1)

[Scope of Claims] 1. A core-sheath composite fiber in which the core-sheath components are both made of aromatic polyester, and the composite fiber-sheath portion has striped striped voids oriented in the fiber axis direction by an alkali weight loss treatment. is present, and the core component contains (a) 1 to 10 polyoxyethylene polyesters that simultaneously satisfy the following (i) and (ii).
% by weight, and (b) 0.1 to 5% by weight of the organometallic salt, and the core/sheath area composite ratio is 5/95 to 50/
A net-like antistatic polyester fiber characterized in that it has a molecular weight of 50. (i) It is a non-random copolymerizable polyoxyethylene polyester represented by the following general formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(I) [In the formula, Z is the residue of an organic compound with a molecular weight of 300 or less having 1 to 6 active hydrogen atoms, and R^1 is an unsubstituted or Substituted alkylene group, R^2 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 40 carbon atoms, or 2 to 4 carbon atoms
0 monovalent acyl group, k represents an integer of 1 to 6, l represents an integer such that k×l is 70 or more, and m represents an integer of 1 or more. ](
ii) The average molecular weight is 5,000 to 16,000. 2. 0.1 to 10 weight of organic sulfonic acid metal salt represented by the general formula RSO_3M (R: alkyl group having 3 to 30 carbon atoms, aryl group or alkylaryl group having 7 to 40 carbon atoms, M: alkali metal) % aromatic polyester as a sheath component, (a) the following (i) and (ii)
Composite spinning is performed using an aromatic polyester containing 1 to 10% by weight of polyoxyethylene polyether that satisfies the following conditions and (b) 0.1 to 5% by weight of an organic metal salt as a core component, and then the obtained core-sheath A method for producing a net-like antistatic polyester, which comprises subjecting molded composite fibers to an alkali weight reduction treatment such that the core/sheath area composite ratio is 5/95 to 50/50. (i) It is a non-random copolymerizable polyoxyethylene polyether represented by the following general formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(I) [In the formula, Z is the residue of an organic compound with a molecular weight of 300 or less having 1 to 6 active hydrogen atoms, and R^1 is an unsubstituted or Substituted alkylene group, R^2 is a hydrogen atom, a monovalent hydrocarbon group having 1 to 40 carbon atoms, or 2 to 4 carbon atoms
0 monovalent acyl group, k represents an integer of 1 to 6, l represents an integer such that k×l is 70 or more, and m represents an integer of 1 or more. ](
ii) The average molecular weight is 5,000 to 16,000.