JP2012001827A - Polyester fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide polyester fiber and fabric with excellent antibacterial properties and deodorizing properties, and a good texture.SOLUTION: The polyester fiber has a sulfur (S) content in the range of 0.03 to 1.0 wt.% with respect to the total weight of polyester in the fiber, an acidic end group content of 50 to 500 eq/T with respect to the total weight of the polyester in the fiber, and fiber strength of 1.0 cN/dt or greater.

Description

  The present invention relates to a polyester fiber that exhibits antibacterial and deodorant properties.

  In recent years, the trend toward health has increased, and polyester fibers having antibacterial and deodorizing properties have been demanded. As means to achieve, inorganic antibacterial agent and adsorbent, polyester fiber kneaded with deodorant in the fiber, and those obtained by applying the above agent to the fabric by post processing, natural antibacterial agent and deodorant by post processing The thing etc. which provided the agent for the fabric etc. are proposed (for example, refer patent document 1, patent document 2, patent document 3).

  However, when the inorganic antibacterial agent is kneaded into the fiber, there is a problem that the polymer constituting the fiber is deteriorated by the agent and the color tone of the fiber is deteriorated. In addition, when an inorganic antibacterial agent containing silver ions or zinc ions or a natural antibacterial agent containing chitosan or the like is applied to the fabric by post-processing, the texture deteriorates due to durability problems or adhesives at the time of post-processing. There was a problem.

  In recent years, in consideration of the environment, it is desired to have antibacterial and deodorizing effects without using metal ion antibacterial agents such as silver ions and zinc ions, and also have good texture and handleability. ing.

Japanese Patent Laid-Open No. 3-241068 JP 2004-190197 A International Publication No. 97/42824 Pamphlet

  The present invention has been made in view of the above background, and an object of the present invention is to provide a polyester fiber that has excellent antibacterial and deodorant properties, little change in color tone, and can have a good texture. .

  As a result of earnest study to achieve the above-mentioned problems, the present inventor has excellent antibacterial and deodorant properties by imparting specific properties to the fiber without using an antibacterial agent or a deodorant, The inventors have found that polyester fibers useful as a fabric excellent in color tone and texture can be obtained, and have made further studies, and have completed the present invention.

That is, according to the present invention,
The amount of sulfur (S) contained in the fiber is 0.03 to 1.0 wt% with respect to the total weight of the polyester constituting the fiber, the acid end amount is 50 to 500 eq / T with respect to the total weight of the polyester, and the fiber strength is Polyester fibers that are 1.0 cN / dtex or higher are provided.

  Preferably, the sulfur and acidic terminals are derived from an ester-forming sulfonic acid metal salt compound represented by the following general formula (1) and / or an ester-forming sulfonic acid phosphonium salt compound represented by the following general formula (2). The fiber which consists of polyester whose copolymerization amount of Formula (1) and / or Formula (2) is 0.1-10 mol% with respect to the polyester total acid component.

（式中、Ａ_１は芳香族基又は脂肪族基、Ｘ_１はエステル形成性官能基、Ｘ_２はＸ_１と同一もしくは異なるエステル形成性官能基または水素原子、Ｍは金属、ｍは正の整数を示す。）

(Wherein A ₁ is an aromatic group or an aliphatic group, X ₁ is an ester-forming functional group, X ₂ is the same or different ester-forming functional group or hydrogen atom as X ₁ , M is a metal, and m is a positive group. Indicates an integer.)

（式中、Ａ_２は芳香族基又は脂肪族基、Ｘ_３はエステル形成性官能基、Ｘ_４はＸ_３と同一もしくは異なるエステル形成性官能基または水素原子、Ｒ_１、Ｒ_２、Ｒ_３及びＲ_４はアルキル基及びアリール基よりなる群から選ばれた同一又は異なる基、ｎは正の整数を示す。）

(Wherein A ₂ is an aromatic group or an aliphatic group, X ₃ is an ester-forming functional group, X ₄ is the same or different ester-forming functional group as X ₃ or a hydrogen atom, R ₁ , R ₂ , R ₃ And R ₄ is the same or different group selected from the group consisting of an alkyl group and an aryl group, and n represents a positive integer.)

  As another embodiment of the present invention, there are provided a fabric and a textile product containing the polyester fiber.

  According to the present invention, an antibacterial and deodorant agent is kneaded into a fiber, and it is excellent in antibacterial and deodorizing properties and has a good color tone and texture without being post-processed on the fiber surface. And polyester fibers which can be made into textile products.

Hereinafter, embodiments of the present invention will be described in detail.
In the polyester fiber of the present invention, the amount of sulfur (S) contained in the fiber is 0.03 to 1.0 wt% with respect to the total polyester weight in the fiber, and the acidic terminal amount is 50 to 500 eq with respect to the total polyester weight. / T, fiber strength is required to be 1.0 cN / dt or more.

  The polyester constituting the polyester fiber of the present invention is preferably a fiber-forming polyester such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate. That is, a polyalkylene terephthalate polyester having terephthalic acid as the main difunctional carboxylic acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or the like as the main glycol component is preferred. Further, a polyether ester having polybutylene terephthalate as a hard segment and polyoxyethylene glycol as a soft segment and polybutylene terephthalate as a hard segment and poly (oxytetramethylene) glycol described in Japanese Patent No. 4202361 as a soft segment. It may be a polyether ester. Furthermore, the polyester includes material-recycled or chemical-recycled polyester, and specific phosphorus compounds and titanium compounds as described in JP-A-2004-270097 and JP-A-2004-212268. Polyester obtained using a catalyst, aliphatic polyester such as polylactic acid and stereocomplex polylactic acid may be used.

Moreover, the polyester which substituted a part of terephthalic acid component with the other bifunctional carboxylic acid component may be sufficient, and / or the polyester which substituted a part of glycol component with the other diol compound may be sufficient.
Here, examples of the bifunctional carboxylic acid other than terephthalic acid used include isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, and adipine. Aromatic, aliphatic and alicyclic bifunctional carboxylic acids such as acid, sebacic acid and 1,4-cyclohexanedicarboxylic acid can be mentioned.

Examples of diol compounds other than the glycol include aliphatic, alicyclic and aromatic diol compounds such as cyclohexane-1,4-methanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycol. be able to.
Further, polycarboxylic acids such as trimellitic acid and pyromellitic acid, polyols such as glycerin, trimethyl p-propane, and pentaerythritol can be used within the range in which the polyester is substantially linear.

  The amount of sulfur (S) contained in the fiber of the polyester fiber of the present invention needs to be 0.03 to 1.0 wt% with respect to the total weight of the polyester in the fiber. The amount of S is an amount measured by a conventionally known method such as fluorescent X-ray. If the amount of S is less than 0.03 wt%, the polyester fiber of the present invention does not exhibit sufficient deodorant and antibacterial properties, whereas if it exceeds 1.0 wt%, coloring and deterioration are severe and the quality is lowered. It is not preferable. A preferable range of the amount of S is 0.05 to 0.7 wt%.

  Sulfur is derived from an ester-forming sulfonic acid group-containing compound in the polyester, and a form copolymerized with the polyester is particularly preferable. The ester-forming sulfonic acid group-containing compound is not particularly limited as long as it is a sulfonic acid group-containing compound having an ester-forming functional group. The ester-forming sulfonic acid metal salt represented by the following general formula (1) A compound and / or an ester-forming sulfonic acid phosphonium salt compound represented by the following general formula (2) can be mentioned as preferred examples.

In the general formula (1), A ₁ represents an aromatic group or an aliphatic group, and preferably an aromatic hydrocarbon group having 6 to 15 carbon atoms or an aliphatic hydrocarbon group having 10 or less carbon atoms. Particularly preferred A1 is an aromatic hydrocarbon group having 6 to 12 carbon atoms, particularly a benzene ring. X ₁ represents an ester-forming functional group, and specific examples thereof include a compound of the following formula (3).

（但し、Ｒ′は低級アルキル基またはフェニル基、ａおよびｄは１以上の整数、ｂは２以上の整数である。）等をあげることができる。Ｘ_２はＸ_１と同一若しくは異なってエステル形成性官能基又は水素原子を示し、なかでもエステル形成性官能基であることが好ましい。Ｍはアルカリ金属またはアルカリ土類金属であり、ｍは正の整数である。なかでもＭがアルカリ金属（例えばリチウム、ナトリウムまたはカリウム）であり、かつｍが１であるものが好ましい。

Wherein R ′ is a lower alkyl group or phenyl group, a and d are integers of 1 or more, and b is an integer of 2 or more. X ₂ is the same as or different from X ₁ and represents an ester-forming functional group or a hydrogen atom, and among them, an ester-forming functional group is preferable. M is an alkali metal or alkaline earth metal, and m is a positive integer. Among them, those in which M is an alkali metal (for example, lithium, sodium or potassium) and m is 1 are preferable.

  Preferable specific examples of the ester-forming sulfonic acid metal salt compound represented by the general formula (1) include sodium 3,5-dicarbomethoxybenzenesulfonate, potassium 3,5-dicarbomethoxybenzenesulfonate, 3, Lithium 5-dicarbomethoxybenzenesulfonate, sodium 3,5-dicarboxybenzenesulfonate, potassium 3,5-dicarboxybenzenesulfonate, lithium 3,5-dicarboxybenzenesulfonate, 3,5-di (β -Hydroxyethoxycarbonyl) sodium benzenesulfonate, potassium 3,5-di (β-hydroxyethoxycarbonyl) benzenesulfonate, lithium 3,5-di (β-hydroxyethoxycarbonyl) benzenesulfonate, 2,6-dicarbo Methoxynaphthalene-4-sulfonic acid Toluim, potassium 2,6-dicarbomethoxynaphthalene-4-sulfonate, lithium 2,6-dicarbomethoxynaphthalene-4-sulfonate, sodium 2,6-dicarboxynaphthalene-4-sulfonate, 2,6- Sodium dicarbomethoxysphthalene-1-sulfonate, sodium 2,6-dicarbomethoxynaphthalene-3-sulfonate, sodium 2,6-dicarbomethoxynaphthalene-4,8-disulfonate, 2,6-dicarboxy Examples thereof include sodium naphthalene-4,8-disulfonate, sodium 2,5-bis (hydroethoxy) benzenesulfonate, α-sodium sulfosuccinic acid and the like. The above ester-forming sulfonic acid metal salt compounds may be used alone or in combination of two or more.

In the general formula (2), A ₂ represents an aromatic group or an aliphatic group, the same definition of A ₁ in the general formula (1). X ₃ represents an ester-forming functional group, and is the same as the definition of X ₁ in the general formula (1). X ₄ is the same as or different from and represents an ester-forming functional group or a hydrogen atom, and the general formula ( This is the same as the definition of X2 in 1). R ₁ , R ₂ , R ₃ and R ₄ represent the same or different groups selected from the group consisting of an alkyl group and an aryl group. n is a positive integer, of which 1 is preferable.

  Preferable specific examples of the ester-forming sulfonic acid phosphonium salt compound represented by the general formula (2) include tetrabutylphosphonium salt of 3,5-dicarboxybenzenesulfonic acid, ethyl tributyl 3,5-dicarboxybenzenesulfonic acid. Phosphonium salt, 3,5-dicarboxybenzene Reference number: P42460 Japanese Patent Application No. 2009-241464 Submitted date: October 20, 2009 7-Benzyltributylphosphonium salt of sulfonate, phenyltributylphosphonium salt of 3,5-dicarboxybenzenesulfonate 3,5-dicarboxybenzenesulfonic acid tetraphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid butyltriphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid benzyltriphenylphosphonium salt Salt, 3,5-dicarboxybenzenesulfonic acid tetrabutylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid ethyltributylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid benzyltributylphosphonium salt, 3,5-di Carboxybenzenesulfonic acid phenyltributylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid tetraphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid ethyltriphenylphosphonium salt, 3,5-dicarboxybenzenesulfonic acid butyltriphenyl Phosphonium salt, 3,5-dicarboxybenzenesulfonic acid benzyltriphenylphosphonium salt, 3-carboxybenzenesulfonic acid tetrabutylphosphonium salt, 3-carboxybenzenesulfonic acid Traphenylphosphonium salt, 3-carbomethoxybenzenesulfonic acid tetrabutylphosphonium salt, 3-carbomethoxybenzenesulfonic acid tetraphenylphosphonium salt, 3,5-di (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetrabutylphosphonium salt, 3 , 5-Di (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetraphenylphosphonium salt, 3- (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetrabutylphosphonium salt, 3- (β-hydroxyethoxycarbonyl) benzenesulfonic acid tetraphenyl Phosphonium salt, 4-hydroxyethoxybenzenesulfonic acid tetrabutylphosphonium salt, 2,6-dicarboxynaphthalene-4-sulfonic acid tetrabutylphosphonium salt, α-teto Etc. can be mentioned tetrabutylphosphonium sulfosuccinate. The ester-forming sulfonic acid phosphonium salts may be used alone or in combination of two or more.

  In the polyester, a fine pore forming agent, a cationic dye dyeing agent, an anti-coloring agent, a thermal stabilizer, a fluorescent whitening agent, a matting agent, a coloring agent may be added as necessary within the range not impairing the object of the present invention. 1 type (s) or 2 or more types of an agent, a hygroscopic agent, and inorganic fine particles may be contained.

  As a method of incorporating the ester-forming sulfonic acid group-containing compound into the polyester, a method of copolymerizing is preferable. Usually, polyesters are esterified directly with terephthalic acid and alkylene glycol, transesterified with a lower alkyl ester of terephthalic acid such as dimethyl terephthalate and alkylene glycol, or reacted with terephthalic acid and ethylene oxide. The first stage reaction to produce a glycol ester of terephthalic acid and / or its low polymer, and the second stage reaction product is heated under reduced pressure to undergo a polycondensation reaction until the desired degree of polymerization is reached. The polyester is synthesized by the reaction of the stage, but the ester-forming sulfonic acid group-containing compound may be added at any stage before the completion of the synthesis, preferably at any stage before the initial stage of the second stage reaction. .

  When using 2 or more types together, each addition time may be arbitrary and both may be added separately or may be mixed previously and added simultaneously. Further, the polyester may be a normal pressure cationic dyeable polyester as described in JP-A-2009-161693. Further, a polyester obtained by copolymerizing the ester-forming sulfonic acid group-containing compound with a polyester may be contained by a method in which the ester-forming sulfonic acid group-containing compound is mixed with a polyester in which the polyester is not copolymerized.

  The polyester fiber of the present invention needs to have an acidic terminal amount of 50 to 500 eq / T with respect to the total weight of the polyester in the fiber. The acidic terminal amount is an amount measured by decomposing a polyester using benzyl alcohol and titrating the decomposition product with a sodium hydroxide aqueous solution using a microburette. When the acidic terminal amount is less than 50 eq / T, the polyester fiber of the present invention cannot exhibit sufficient deodorizing properties and antibacterial properties, whereas when it exceeds 500 eq / T, it does not retain sufficient strength. Since it becomes possible, it is not preferable. The range of preferable acidic terminal amount is 70 to 300 eq / T.

  Examples of the method for adjusting the acidic terminal amount of the polyester fiber of the present invention to 50 to 500 eq / T include, for example, a polyester comprising a polyester obtained by copolymerizing an ester-forming sulfonic acid metal salt compound and / or an ester-forming sulfonic acid phosphonium salt compound. This can be achieved by subjecting the fiber to an acid treatment. That is, the ester-forming sulfonic acid metal salt compound and / or the ester-forming sulfonic acid phosphonium salt compound vicinity, the ester bond of the polyester main chain is cleaved to generate a carboxylic acid terminal, or the sulfonic acid from the sulfonate The amount of acidic ends increases due to the end generation.

  As a method for performing the acid treatment, for example, 60 ° C. or more (preferably 70 to 130 ° C., particularly preferably) in a bath prepared with acetic acid or the like to have a pH of 5.0 or less (preferably 2.0 to 4.0). May be immersed at 80 to 120 ° C.).

  The polyester fiber of the present invention needs to have a strength of 1.0 cN / dtex or more. If the strength is less than 1.0 cN / dtex, the fibers are weak and the handling properties and durability are insufficient. The preferred strength is 1.5 cN / dtex or more, more preferably 2.0 cN / dtex or more. On the other hand, the upper limit of strength is preferably as high as possible, but is preferably less than 6 cN / dtex from the viewpoint of workability.

  Although the fiber form of the polyester fiber of the present invention is not particularly limited, it is a long fiber (multifilament yarn) rather than a short fiber (spun yarn) in order to increase the surface area of the fiber to obtain excellent antibacterial and deodorant properties. It is preferable. In particular, the polyester fiber is a core-sheath type composite fiber, the copolymer polyester is arranged in the sheath, and polyethylene terephthalate or the like that does not copolymerize the third component is arranged in the core, or the polyester fiber is a side-by-side type It can be mentioned as a preferred embodiment that a composite fiber is used, in which the copolyester is disposed in one component and polyethylene terephthalate or the like that does not copolymerize the third component is disposed in the other.

  In the polyester fiber of the present invention, the cross-sectional shape of the single fiber is not particularly limited, but in addition to a general round cross section, an irregular cross section such as a triangular shape, a flat shape, a flat shape with a constriction, and a hollow shape can also be used. It is preferable to improve the surface area of the fiber as an atypical cross section because the antibacterial and deodorizing effects are also improved. Further, such a polyester fiber may be subjected to normal air processing, false twist crimp processing, and twisted yarn. In particular, it is preferable to perform false twist crimping to increase the bulk of the polyester fiber and increase the surface area of the fiber to obtain excellent antibacterial and deodorant properties. At that time, the crimp rate of the false twist crimped yarn is preferably 1% or more.

  Regarding the total fineness, single fiber fineness, and number of filaments of the polyester fiber of the present invention, in order to obtain excellent antibacterial and deodorant properties by increasing the surface area of the fiber, the total fineness is 10 to 200 dtex, and the single fiber fineness is 5.0 dtex. The following (more preferably 0.0001 to 1.5 dtex) and the number of filaments 30 to 50000 (more preferably 30 to 200) are preferable.

  When the polyester fiber of the present invention is used as a fabric, it may be used for all or part of the fabric. When partially used, the mixing ratio may be determined within a range that does not impair the development of antibacterial and deodorant properties. A preferable mixing ratio is 10% or more. The structure is not particularly limited, and may be a woven fabric, a knitted fabric, or a non-woven fabric. For example, in the woven structure of the woven fabric, a three-fold structure such as plain weave, oblique weave, and satin weave, altered structure, altered structure such as altered oblique weaving, single double structure such as vertical double weave, weft double weave, Examples are vertical pile weaves such as warp velvet, towels and velours, and weave pile weaves such as benjin, weft velvet, velvet and cole. In addition, the textile fabric which has these woven structures can be woven by a normal method using normal looms, such as a rapier loom and an air jet loom. The number of layers is not particularly limited and may be a single layer or a woven fabric having a multilayer structure of two or more layers.

  In addition, the type of knitted fabric may be a weft knitted fabric or a newly knitted fabric. Preferred examples of the weft knitting structure include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, float knitting, one-sided knitting, lace knitting, bristle knitting, and the like. Preferred examples include single atlas knitting, double cord knitting, half tricot knitting, back hair knitting, jacquard knitting and the like. The knitting can be knitted by a normal method using a normal knitting machine such as a circular knitting machine, a flat knitting machine, a tricot knitting machine, and a Raschel knitting machine. The number of layers is not particularly limited and may be a single layer or a knitted fabric having a multilayer structure of two or more layers.

In the above-mentioned fabric, it is also preferable to increase the water absorption due to capillary action by making the fabric a multi-layered woven or knitted fabric of two or more layers, changing the single fiber fineness of the fibers constituting each layer, or changing the density. is there. In addition, it is preferable that the fabric has a multilayer structure and the polyester fiber is disposed in a layer located on the skin side (back side) during use. The basis weight of the polyester fabric is preferably large in order to obtain excellent antibacterial properties and deodorant properties, and is preferably 50 g / m ² or more (more preferably 100 to 250 g / m ² ).

  When the polyester fabric is a woven fabric, the warp cover factor and the weft cover factor are both 500 to 5000 (more preferably 500 to 2500) in order to obtain excellent antibacterial and deodorant properties. It is preferable that The cover factor CF in the present invention is represented by the following formula. Warp cover factor CFp = (DWp / 1.1) 1/2 × MWp Weft cover factor CFf = (DWf / 1.1) 1/2 × MWf [DWp is the total warp fineness (dtex), MWp is the warp weave density ( Book / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (book / 2.54 cm). ]

  The polyester fabric thus obtained has excellent antibacterial and deodorizing properties and antifouling properties with excellent durability. Although the mechanism is not yet fully elucidated, it is presumed that the effect of suppressing the growth of bacteria or reducing the odorous component is manifested by acidifying the polyester fabric.

  Since the polyester fiber of the present invention has no change in appearance and touch with normal polyester fiber, the above-mentioned polyester fabric is used as a textile product, sportswear, outdoor wear, raincoat, umbrella, It can be usefully used in many applications such as men's clothing, women's clothing, work clothing, protective clothing, artificial leather, footwear, bags, curtains, tarpaulins, tents and car seats.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. However, the present invention is not limited by these. Each measured value is a value measured by the following method.
(1) Sulfur (S) amount (wt%)
About 5 grams of fiber was melted on a heated hot plate to form a flat plate. Subsequently, the sulfur atom in the plate shape | molded by the fluorescent X ray method was quantified using the fluorescent X-ray-spectral-analysis apparatus ZSX100e type | mold by Rigaku Corporation.
(2) Total acidic terminal amount (eq / T)
Polyester fabric was decomposed using benzyl alcohol, and this decomposition product was titrated with 0.02N aqueous sodium hydroxide solution using phenol red as an indicator to obtain an equivalent amount per ton.
(3) Tensile strength, elongation, and fineness of fiber Measurement was performed according to the method described in JIS L1013.
(4) Antibacterial activity After the polyester cloth was washed 10 times according to the JIS L0217 method (L10), the bacteriostatic activity value and bactericidal activity were measured by the JIS L1902 bacterial liquid absorption method (test bacteria: Staphylococcus aureus). Activity values were measured. The bacteriostatic activity value of 2.2 or more was accepted (◯), less than 2.2 was rejected (x), the bactericidal activity value was 0 or more was accepted (◯), and less than 0 was rejected (x).
(5) Deodorant A 10 cm × 10 cm square sample is placed in a Tedlar bag containing 3 L of air containing ammonia with an initial concentration of 100 ppm, and the concentration of odorous components in the Tedlar bag after 2 hours is detected with a detector tube manufactured by GASTEX Measured and the odor adsorption rate was determined from the amount of decrease as in the following formula.
Odor adsorption rate (%) = (initial odor component concentration−odor component concentration after 2 hours) / (initial odor component concentration) × 100

[Example 1]
Add 0.03 parts by weight of manganese acetate and 0.12 parts by weight of sodium acetate trihydrate to a mixture of 100 parts by weight of dimethyl terephthalate, 1.7 parts by weight of dimethyl 5-sodium sulfoisophthalate and 60 parts by weight of ethylene glycol. Then, the temperature was gradually raised from 140 ° C. to 240 ° C., and transesterification was performed while distilling out the methanol produced as a result of the reaction out of the system. Thereafter, 0.03 part by weight of normal phosphoric acid was added to complete the transesterification reaction. Thereafter, 0.05 parts by weight of antimony trioxide, 0.3 parts by weight of tetraethylammonium hydroxide and 0.003 parts by weight of triethylamine were added to the reaction product, transferred to a polymerization vessel, heated to 285 ° C., and 30 Pa or less. The polycondensation reaction is performed in a high vacuum, and the reaction is terminated when the agitator power in the polymerization tank reaches a predetermined power or when a predetermined time has elapsed, and 1 mol% of 5-sodium sulfoisophthalic acid is copolymerized according to a conventional method. The resulting polyester was chipped.

The copolymerized polyethylene terephthalate chip thus obtained was discharged from a spinneret having 72 round discharge holes at a polymer discharge temperature of 290 ° C. and a discharge rate of 41.6 g / min, 20 ° C., and an average wind speed of 0.4 m / sec. . After cooling the molten multifilament with the cooling air, oiling with an oiling nozzle was performed, and simultaneously, the filaments of the multifilament were converged and spun at a speed of 3000 m / min to obtain a solid polyester multifilament.
The obtained solid polyester multifilament was subjected to a false twisting treatment of 1.55 times at a heat setting temperature of 180 ° C. to obtain a polyester multifilament having a fineness of 86.2 dtex and an elongation of 25%.
By processing the obtained polyester multifilament into a cylindrical knitting having a basis weight of 120 g / m ² and immersing it in a bath adjusted to pH 5.0 or less with malic acid at a temperature of 100 ° C. for 30 minutes and subjecting it to an acid treatment. The polyester multifilament was acidified. A known liquid dyeing machine was used for the acid treatment. Table 1 shows the results of evaluating the polyester fibers subjected to the acid treatment by the above methods.

[Example 2, Comparative Examples 1-2]
A polyester fiber was obtained in the same manner as in Example 1 except that the amount of dimethyl 5-sodium sulfoisophthalate constituting the polyester fiber was changed as shown in Table 1. The evaluation results are shown in Table 1.

[Comparative Examples 3 to 4]
A polyester fiber was obtained in the same manner as in Example 1 except that the polyester multifilament of Example 1 was not subjected to the acid treatment and the conditions during the acid treatment were 130 ° C. and 60 minutes. The evaluation results are shown in Table 1.
As shown in Table 1, those within the scope of the present invention exhibited good antibacterial and deodorant properties and good handleability. On the other hand, Comparative Example 1 with a small amount of S and a small amount of total acidic terminal, and Comparative Example 3 with a total acidic terminal amount of less than the specified value cannot obtain antibacterial and deodorizing properties, and the S amount falls within the scope of the invention. The comparative example 2 exceeding and the comparative example 4 whose total acidic terminal group amount exceeds a prescribed value, although having performance, were insufficient in strength, inferior in handleability, and difficult to put to practical use.

The polyester fiber of the present invention is excellent in antibacterial and deodorant properties, has a good texture and good handleability, and can be used in many applications including apparel and hygiene products, and its industrial value is extremely large.

Claims (3)

  The amount of sulfur (S) contained in the fiber is 0.03 to 1.0 wt% with respect to the total weight of the polyester constituting the fiber, the acid end amount is 50 to 500 eq / T with respect to the total weight of the polyester, and the fiber strength is A polyester fiber characterized by being 1.0 cN / dtex or more. The sulfur and / or acidic end group is derived from an ester-forming sulfonic acid metal salt compound represented by the following general formula (1) and / or an ester-forming sulfonic acid phosphonium salt compound represented by the following general formula (2). The polyester fiber according to claim 1, which is a polyester fiber containing 0.1 to 10 mol% of the formula (1) and / or the formula (2) with respect to the total acidity of the polyester.

(Wherein A ₁ is an aromatic group or an aliphatic group, X ₁ is an ester-forming functional group, X ₂ is the same or different ester-forming functional group or hydrogen atom as X ₁ , M is a metal, and m is a positive group. Indicates an integer.)

(Wherein A ₂ is an aromatic group or an aliphatic group, X ₃ is an ester-forming functional group, X ₄ is the same or different ester-forming functional group as X ₃ or a hydrogen atom, R ₁ , R ₂ , R ₃ And R ₄ is the same or different group selected from the group consisting of an alkyl group and an aryl group, and n represents a positive integer.)   The fabric and textiles containing the polyester fiber in any one of Claims 1-2.