JP2012012749A - Core-sheath type polyester conjugate fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core-sheath type polyester conjugate fiber, a polyester fabric, and a textile product that have a durable excellent antimicrobial property and a durable excellent deodorant property.SOLUTION: There is provided a core-sheath type polyester conjugate fiber having antimicrobial and deodorant functions that satisfies the following requirements. (1) A core-sheath type conjugate fiber is composed of two kinds of polyester polymers. The core part of the core-sheath type conjugate fiber consists of polyester A having an intrinsic viscosity of 0.60 to 1.0, and the sheath part consists of polyester B having an intrinsic viscosity of 0.30 to 0.80 in which a specific metallic salt compound of ester-forming sulfonic acid is copolymerized in an amount of 0.1 to 10 mol% based on the total acid components constituting the polyester. (2) Single filament fineness of the core-sheath type conjugate fiber is 5.0 dtex or less. (3) Strength of the core-sheath type conjugate fiber is 1.0 cN/dtex or more. (4) The ratio SA:SB of a core part area SA to a sheath part area SB is in a range of 95:5 to 50:50. (5) An acidic treatment is performed after a fiber is formed.

Description

  The present invention relates to a core-sheath type polyester composite fiber having antibacterial and deodorant properties.

  Conventionally, as a polyester fabric having antibacterial properties, a fabric composed of an antibacterial polyester fiber in which an inorganic antibacterial agent is kneaded into the fiber, a fabric obtained by applying an inorganic antibacterial agent to the fabric by post-processing, and post-processing Various things, such as what gave a natural system antibacterial agent to cloth, are proposed (for example, refer to patent documents 1, patent documents 2, patent documents 3).

  However, when the inorganic antibacterial agent is kneaded into the fiber, there is a problem that the color tone of the fiber is deteriorated. In addition, there was a problem of durability in the case where an inorganic antibacterial agent containing silver ions or zinc ions or a natural antibacterial agent containing chitosan was applied to the fabric by post-processing. Furthermore, when using an inorganic antibacterial agent containing silver ions, zinc ions, etc., there are also environmental problems.

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 thereof is to provide a core-sheath type polyester composite fiber and a polyester fabric having excellent antibacterial properties and deodorizing properties with excellent durability.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventor surprisingly has excellent antibacterial and deodorizing properties by acidifying a polyester fabric without using an antibacterial agent. The present inventors have found that a polyester fabric can be obtained, and have further intensively studied to complete the present invention.

That is, according to the present invention, a core-sheath type polyester composite fiber having antibacterial and deodorizing functions, characterized by satisfying the following requirements:
(1) A core-sheath type composite fiber composed of two types of polyester polymers, wherein the core part of the core-sheath type composite fiber has polyester A having an intrinsic viscosity in the range of 0.60 to 1.0, and the sheath part However, the intrinsic viscosity of the ester-forming sulfonic acid metal salt compound represented by the following general formula (1) is copolymerized in the range of 0.1 to 10 mol% with respect to all the acid components constituting the polyester. It consists of polyester B in the range of 0.30 to 0.80.
X ₁ -A ₁ -X ₂ formula (1)
｜
(SO ₃ M) _m
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 as X ₁ , or a hydrogen atom, M is a metal, and m is a positive Indicates an integer.)
(2) The single yarn fineness of the core-sheath composite fiber is 5.0 dtex or less.
(3) The strength of the core-sheath composite fiber is 1.0 cN / dtex or more.
(4) The ratio SA: SB of the area SA of the core portion and the area SB of the sheath portion is in the range of 5:95 to 50:50.
(5) It has been subjected to an acid treatment after fiberization.

Preferably,
A core-sheath type polyester composite fiber in which the metal salt compound of ester-forming sulfonic acid is copolymerized in the range of 0.1 to 10 mol% with respect to the total polyester acid component,
A core-sheath polyester composite fiber in which the metal salt compound of ester-forming sulfonic acid is 5-sodium sulfoisophthalic acid,
A core-sheath type polyester composite fiber having a strength of 2.0 cN / dtex or more,
A core whose antibacterial activity value measured by JIS L1902 Bacterial Absorption Method (Test Bacteria: Staphylococcus aureus) is 2.2 or more after washing 10 times according to JIS L0217 method Sheath-type polyester composite fiber,
A core-sheath type polyester whose antibacterial activity is 0 or more in the bactericidal activity value measured by the JIS L1902 bacterial liquid absorption method (test bacteria: Staphylococcus aureus) after washing 10 times specified in the JIS L0217 method Composite fiber,
A core-sheath type polyester composite fiber having a deodorizing property of 65% or more,
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the polyester fabric which has the antibacterial property and deodorizing property which were excellent in durability, and antifouling property, its manufacturing method, and a textile product are obtained.

Hereinafter, embodiments of the present invention will be described in detail.
Polyester A constituting the core component of the core-sheath type polyester composite fiber of the present invention is preferably polyethylene terephthalate, polybutylene terephthalate or polytrimethylene terephthalate. That is, a polyalkylene terephthalate-based polyester having terephthalic acid as the main difunctional carboxylic acid component and ethylene glycol, trimethyleneterene glycol, tetramethylene glycol or the like as the main glycol component is preferable. 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 as a soft segment described in Japanese Patent No. 4202361 Polyether ester may be used. 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.

  Such polyester is synthesized by any method. In the case of polyethylene terephthalate (PET), which is a typical polyester, terephthalic acid and ethylene glycol are usually esterified directly, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol. Or the reaction of the first stage in which terephthalic acid and ethylene oxide are reacted to form a glycol ester of terephthalic acid and / or its low polymer, and the reaction product of the first stage is heated under reduced pressure to obtain the desired It is produced by a second stage reaction in which a polycondensation reaction is carried out until a polymerization degree of

As polyester B constituting the sheath component, an ester-forming sulfonic acid group-containing compound is copolymerized in the core component polyester A in an amount of 0.1 to 10 mol% based on the total acid component of the sheath component polyester B. is required. 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 compound represented by the following general formula (1) Can be mentioned as preferred.
X ₁ -A ₁ -X ₂ formula (1)
｜
(SO ₃ M) _m

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 A ₁ is an aromatic hydrocarbon group having 6 to 12 carbon atoms, particularly a benzene ring. X ₁ represents an ester-forming functional group, X ₂ is the same as or different from X ₁ and represents an ester-forming functional group or a hydrogen atom, and among these, 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. If the ester-forming sulfonic acid metal salt compound is less than 0.1 mol%, the antibacterial property is lowered, and if it exceeds 10 mol%, the fiber strength is undesirably lowered.

  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 sheath component polyester B, a fine pore forming agent, a cationic dye dyeing agent, a coloring inhibitor, a heat stabilizer, a fluorescent whitening agent, a matting agent may be used as long as the purpose of the present invention is not impaired. 1 type, or 2 or more types of a coloring agent, a hygroscopic agent, and inorganic fine particles may be contained.

In order to copolymerize the ester-forming sulfonic acid group-containing compound with polyester, it may be added at any stage before the completion of the above-described polyester synthesis, preferably at any stage prior to the initial stage of the second stage reaction. That's fine. 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.

The core-sheath type polyester composite fiber of the present invention can be produced by converting the core component polyester A and the sheath component polyester B into chips and using a known core-sheath composite spinning device.
The fiber form of the core-sheath type polyester composite fiber of the present invention is not particularly limited, but in order to obtain excellent antibacterial and deodorant properties by increasing the surface area of the fiber, long fibers (multifilaments) rather than short fibers (spun yarns) Thread).
The cross-sectional shape of the single fiber is not particularly limited, but a modified cross-section such as a triangular shape, a flat shape, a flat shape with a constriction, etc. is preferable because the surface area of the single fiber is large.

  Moreover, the fiber strength of the core-sheath type polyester composite fiber of this invention is 1 cN / dtex or more. When it is less than 1 cN / dtex, it is not preferable for fields requiring strength such as sports applications. Moreover, the area ratio in the cross section orthogonal to the fiber axis of the core component of the core-sheath-type polyester composite fiber of this invention and a sheath component needs to be core component area SA: sheath component area SB = 5: 95-50: 50. is there. When the core component is less than 5, the fiber strength is undesirably lowered. Moreover, when a sheath component is less than 50, antibacterial property falls and it is not preferable.

  The core-sheath type polyester composite fiber of the present invention may be subjected to normal air processing, false twist crimping, 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.

  Moreover, as the total fineness, single fiber fineness, and number of filaments of the core-sheath polyester composite 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, It is preferable that the single fiber fineness is 5.0 dtex or less (more preferably 0.0001 to 1.5 dtex) and the number of filaments is 30 to 50000 (more preferably 30 to 200).

The core-sheath type polyester composite fiber of the present invention needs to be subjected to an acid treatment after fiberization. However, when the acid treatment is not performed, the antibacterial property and the deodorant property are not preferable. The conditions for the acidic treatment include, for example, a temperature of 70 ° C. or higher (preferably 80 to 130 ° C., particularly in a bath prepared with acetic acid or the like so that the pH is 5.0 or lower (preferably 2.0 to 5.0). Preferably, the immersion is performed for 90 to 130 ° C. for 20 to 40 minutes. The ionic part of the ester-forming sulfonic acid metal salt compound is protonated and the polyester is acidified.
As an acid treatment method, it is preferable to carry out an acid treatment after fabric formation as an efficient method. As the equipment used at that time, a known liquid dyeing machine may be used.

The core-sheath type polyester composite fiber of the present invention is preferably used as a fabric together with other fibers. At that time, the amount of the core-sheath type polyester composite fiber of the present invention is preferably 10% or more based on the total weight of the fabric. As other fibers, known polyester fibers, nylon, natural fibers and the like can be used. If the amount of the core-sheath polyester composite fiber of the present invention is less than 10%, the antibacterial and deodorant properties are not obtained, which is not preferable.
The fabric weight is preferably larger in order to obtain excellent antibacterial and deodorant properties, and is preferably 50 g / m ² or more (more preferably 100 to 250 g / m ² ).

  The fabric 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 order to obtain excellent antibacterial and deodorant properties, it is preferable that the cover factor of the warp and the cover factor of the weft are both 500 to 5000 (more preferably 500 to 2500). 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 (main / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm). ]

  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.

  It is also preferable to increase the water absorption due to the capillary phenomenon by changing the single fiber fineness or the density of the fibers constituting each layer as a multi-layer structure woven or knitted fabric of two or more layers. In addition, it is preferable that the fabric has a multilayer structure and the core-sheath type polyester composite fiber of the present invention is disposed in a layer located on the skin side (back side) in use.

In addition, the fabric may be subjected to various processes such as dyeing, scouring, relaxing, pre-setting, and final setting in the usual manner before and / or after the acid treatment. In addition, various processing that provides functions such as brushed processing, water repellent processing, calendar processing, ultraviolet shielding or antistatic agent, antibacterial agent, deodorant agent, insect repellent agent, phosphorescent agent, retroreflective agent, negative ion generator, etc. Additional applications may be applied.
Of these, it is preferable to perform hydrophilic processing (sweat-absorbing processing) on the fabric in the step subsequent to the acid treatment because more excellent antibacterial properties, deodorizing properties and antifouling properties can be obtained.

  For hydrophilic processing, a hydrophilic agent such as PEG diacrylate and its derivatives or a polyethylene terephthalate-polyethylene glycol copolymer is attached at 0.25 to 0.50% by weight with respect to the fabric weight by the same bath processing at the time of dyeing. It is preferable.

  The fabric containing the core-sheath polyester composite fiber of the present invention thus obtained has excellent antibacterial properties, deodorizing properties and antifouling properties with excellent durability. Although the mechanism has not been fully elucidated yet, it is estimated that the acidification of the polyester fabric may suppress the growth of bacteria and the generation of odorous components.

When the fabric obtained in this way has a tensile strength of the polyester composite fiber contained in the fabric after the acid treatment is 1.0 cN / dtex or more, preferably 2.0 cN / dtex or more when used for sports desirable. Moreover, it is preferable that the protonation rate of the core-sheath type polyester composite fiber of the present invention contained in the polyester fabric after the acid treatment is 10% or more (more preferably 20 to 50%). When the protonation rate is less than 10%, the antibacterial and deodorizing properties are lowered, which is not preferable. However, the protonation rate is measured by the following formula.
Protonation rate (%) = (A−B) / A × 100
A is a functional group concentration obtained by measuring the polyester fiber by fluorescent X-ray analysis, and B is a metal ion concentration obtained by measuring the polyester fiber by raw yarn absorption analysis.

  Since the fabric has a pH of less than 7.0, the fabric has excellent durability, antibacterial properties, deodorizing properties, and antifouling properties. At that time, the antibacterial property of the polyester fabric is the bacteriostatic activity value measured by the JIS L1902 bacterial liquid absorption method (test bacteria: Staphylococcus aureus) after washing 10 times specified in the JIS L0217 method. It is preferable that it is 2.2 or more. Moreover, it is preferable that it is 0 or more by the bactericidal activity value measured by the JIS L1902 bacterial-liquid absorption method (test microbe: Staphylococcus aureus) after 10 times of washing | cleaning prescribed | regulated to JISL0217 method. Further, the deodorizing property of the polyester fabric is preferably 65% or more.

  However, the deodorizing property is that 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 malodorous components in the Tedlar bag after 2 hours is applied to a detector tube manufactured by GASTEX. And determine the odor adsorption rate from the decrease.

  Further, the antifouling property of the polyester fabric is preferably a third grade or higher. However, the antifouling property is measured by a dirt removal test specified in JIS L1919C (use of lipophilic pollutant 3).

  Furthermore, as a fiber product containing the core-sheath type polyester composite fiber of the present invention, sportswear, outdoor wear, raincoat, umbrella, men's clothing, women's clothing, work clothing, protective clothing, using the above-mentioned fabric, It is also useful as a textile product or hygiene product selected from the group of artificial leather, footwear, heels, curtains, tarpaulins, tents and car seats. Since such a textile product uses the above-mentioned fabric, it has excellent durability, antibacterial properties, deodorizing properties, and antifouling properties.

  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) Intrinsic viscosity:
A dilute solution obtained by dissolving the polyester composition in orthochlorophenol at 100 ° C. for 60 minutes was determined from a value measured at 35 ° C. using an Ubbelohde viscometer. The intrinsic viscosity of the tip is ηC, and the intrinsic viscosity of the undrawn yarn after spinning is ηF.

(2) Tensile strength / elongation of fiber Measurement was performed according to the method described in JIS L1070.

(3) Fabric weight of polyester fabric The fabric weight (g / m ² ) of the polyester fabric was measured according to JIS L 1096.

(4) Core-sheath area ratio About 20 single filaments of multifilament, the area of the core and the sheath was measured from the cross-sectional photograph of the fiber, and the area ratio of the core component and the sheath component was determined from the average value.

(5) Antibacterial activity After the polyester cloth was washed 10 times according to JIS L0217 method (L10), the bacteriostatic activity value and bactericidal activity were measured by IS L1902 bacterial solution 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).

(6) Deodorant A 10 cm × 10 cm square sample is put in a Tedlar bag containing 3 L of air containing ammonia with an initial concentration of 100 ppm, and the concentration of malodorous 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 (%) = (original malodorous component concentration-2 malodorous component concentration after 2 hours) / (original malodorous component concentration) × 100

(7) Number of Fluffs Using a DT-104 type fluff counter device manufactured by Toray Industries, Inc., a polyester false twisted yarn sample was continuously measured at a speed of 500 m / min for 20 minutes, and the number of fluffs was measured. Expressed as the number per 10,000 m.

[Example 1]
Polyethylene terephthalate chip obtained by copolymerizing 1.5 mol% of 5-sodiumsulfoisophthalic acid as an ester-reactive sulfonic acid group-containing compound with respect to the total acid component, and 0.4% by weight of titanium oxide fine particles, intrinsic viscosity of 0 .65 ordinary polyethylene terephthalate chips were dried by a conventional method, and then the chips were melted by a conventional method in a spinning facility, and introduced into each composite fiber spin pack through a spin block. One spin yarn while applying spinning oil agent from a spinneret with 72 core-sheath type compound circular discharge holes incorporated in the spin pack, cooled and solidified with cooling air from a normal crossflow type spinning cylinder The polyester core-sheath type composite undrawn yarn having a core / sheath area ratio of 140 dtex / 72 filaments of 70:30 was obtained by concentrating as strips and taking up at a speed of 3000 m / min (draft magnification: 200).
A polyester false twisted yarn having a core-sheath ratio of 70:30 with a total fineness of 84 dtex / 72 fil (average single yarn fineness of 1.17 dtex) was obtained by subjecting the polyester undrawn yarn to a known false twist drawing process. .

Then, using a 28G circular knitting machine, a smooth circular knitted fabric was knitted using the polyethylene terephthalate false twisted yarn.
Next, the knitted fabric was subjected to an acid treatment by being immersed in a bath adjusted to pH 4.8 with acetic acid at a temperature of 130 ° C. for 30 minutes. The knitted fabric was then subjected to conventional dyeing finishing. In the obtained knitted fabric, the basis weight is 200 g / m ² , and as shown in Table 1, the fabric has a low pH (acidification) even after washing 5 times, and has excellent antibacterial and deodorizing properties. In addition, a good-quality fabric having good dyeability and few fluff was obtained. Next, when sportswear (T-shirt) was sewn and worn using the knitted fabric, it had excellent antibacterial and deodorant properties.

[Examples 2-3, Comparative Examples 1-2]
The same procedure as in Example 1 was performed except that the amount of sodium 5-sulfoisophthalate added in Example 1 was changed to that shown in Table 1. The results are shown in Table 1.

[Examples 4-5, Comparative Examples 3-4]
In Example 1, it implemented like Example 1 except having changed the core-sheath ratio so that it might become Table 1. FIG. The results are shown in Table 1.

[Comparative Examples 5-6]
In Example 1, it implemented like Example 1 except having changed the intrinsic viscosity of polyester A and B so that it might become Table 1. FIG. The results are shown in Table 1.

  ADVANTAGE OF THE INVENTION According to this invention, the core-sheath-type polyester composite fiber and polyester fabric which have the durable antibacterial property and deodorant property, a polyester fabric, and a textile product are provided, The industrial value is very large.

Claims (8)

A core-sheath type polyester composite fiber having antibacterial and deodorizing functions, characterized by satisfying the following requirements.
(1) A core-sheath type composite fiber composed of two types of polyester polymers, wherein the core part of the core-sheath type composite fiber has polyester A having an intrinsic viscosity in the range of 0.60 to 1.0, and the sheath part However, the intrinsic viscosity of the ester-forming sulfonic acid metal salt compound represented by the following general formula (1) is copolymerized in the range of 0.1 to 10 mol% with respect to all the acid components constituting the polyester. It consists of polyester B in the range of 0.30 to 0.80.
X ₁ -A ₁ -X ₂ formula (1)
｜
(SO ₃ M) _m
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 as X ₁ , or a hydrogen atom, M is a metal, and m is a positive Indicates an integer.)
(2) The single yarn fineness of the core-sheath composite fiber is 5.0 dtex or less.
(3) The strength of the core-sheath composite fiber is 1.0 cN / dtex or more.
(4) The ratio SA: SB of the core area SA to the sheath area SB is in the range of 95: 5 to 50:50.
(5) It has been subjected to an acid treatment after fiberization.   The core-sheath polyester composite fiber according to claim 1, wherein the metal salt compound of ester-forming sulfonic acid is 5-sodium sulfoisophthalic acid.   The core-sheath type polyester composite fiber according to any one of claims 1 to 2, wherein the fiber strength is 2.0 cN / dtex or more.   Antibacterial activity is 10 or more times after washing specified in JIS L0217 method, and the bacteriostatic activity value measured by JIS L1902 bacteria absorption method (test bacteria: Staphylococcus aureus) is 2.2 or more, The core-sheath type polyester composite fiber according to any one of claims 1 to 3.   The antibacterial activity is 0 or more as a bactericidal activity value measured by a JIS L1902 bacterial solution absorption method (test bacteria: Staphylococcus aureus) after 10 times of washing specified in JIS L0217 method. The core-sheath type polyester composite fiber according to any one of -4.   The core-sheath type polyester composite fiber according to any one of claims 1 to 5, wherein the deodorizing property is 65% or more.   A fabric comprising the core-sheath polyester conjugate fiber according to any one of claims 1 to 6.   A fiber product comprising the core-sheath polyester composite fiber according to any one of claims 1 to 6.