JP4704197B2 - Polyester fiber - Google Patents

Description

  The present invention is a fiber having moisture absorption / release performance, containing ceramic fine particles, and having a flat cross-sectional shape, and is excellent in comfort, and is particularly suitable for clothing materials such as innerwear, sports clothing, and blouses. The present invention relates to a polyester fiber that can be suitably used.

  Polyesters typified by polyethylene terephthalate have excellent mechanical and chemical properties, are used in a wide range of fields, and particularly have a very wide range of uses as synthetic fibers.

  However, since polyester fiber is hydrophobic, it is extremely low in hygroscopicity, and is used in fields where the skin is directly touched or worn close to the skin, such as innerwear, pants, and sports clothing. In this case, stuffiness or stickiness due to sweating from the skin occurs, which is significantly inferior to natural fibers in terms of comfort, and its use in the clothing field is greatly restricted.

  Conventionally, various attempts have been made to impart hydrophilicity or hygroscopicity to polyester fibers. For example, Patent Document 1 proposes a hygroscopic polyester fiber made of a polyester composition containing 50 to 70% by mass of polyalkylene glycols. However, since this fiber contains a large amount of polyalkylene glycol, the color tone was poor and the light fastness was remarkably inferior.

  In order to solve such problems, Patent Document 2 discloses a core-sheath type composite fiber in which a hygroscopic polymer having a moisture absorption rate of 10% by mass or more at normal temperature is used as a core and the sheath is covered with ordinary polyester. Has been proposed. Since this composite fiber is covered with ordinary polyester on the outside, both the color tone and light fastness are good, but the hygroscopic polymer in the core is greatly swollen by hot water during dyeing, so the surface of the composite fiber There was a problem that the core polymer having high affinity to water flows out to the outside.

  Patent Document 3 proposes a polyester fiber containing an alkyl sulfonate and / or an alkyl benzene sulfonate and a polyalkylene glycol. This fiber was a fiber having moisture absorption performance and excellent color tone and light fastness. However, in this fiber, the moisture-absorbing component and polyester are not sufficiently compatible with each other, so the moisture-absorbing component may bleed out during melt spinning, and may further bleed out due to dyeing processing. There was a problem of doing.

  Furthermore, in clothing applications, wear for sports where the skin is exposed to ultraviolet rays, such as golf and tennis, is required to have UV shielding properties, or wear that prefers light colors, such as blouses and lab coats, is required to have sheer prevention. The As a method for solving these problems, methods such as thickening the fabric and thickening the fabric have been conventionally performed, but in this method, the temperature of the clothing darkened by direct sunlight rises and the comfort is impaired, Decreasing aesthetics and comfort due to thick fabrics may occur. Thus, products that satisfy high permeation resistance, ultraviolet shielding effect, and dry feeling at the same time due to diversification and individualization of needs are also desired.

As what satisfies the above-described function, for example, Patent Document 4 proposes a fiber core containing titanium dioxide. Although this fiber can provide a product with permeation resistance, ultraviolet shielding effect and dry feeling (contact cooling) compared to normal yarn, most of the ultraviolet and visible light incident on the sheath will pass through. Therefore, there is a problem that the effect is not sufficient.
JP 62-267352 A JP-A-2-99612 JP 2004-353140 A JP-A-10-110328

  The present invention solves the above-mentioned problems, has excellent hygroscopicity and moisture release, and is excellent in color tone, ultraviolet shielding effect, dry feeling (contact cooling sensitivity), An object of the present invention is to provide a polyester fiber suitable for apparel use that is used in a state where it is in direct contact with the skin or in a state close to the skin.

  The inventors of the present invention have arrived at the present invention as a result of studies to solve the above problems.

That is, the present invention is a polyalkylene terephthalate as a main component, a polyester fiber composed of a polymer containing as a second component following (A) and a mixture of (B) (C), in the fiber ( C) a free chromatic amount 1 to 20% by weight of, and the ceramic particles in the fiber contains 1.0 to 8.0 wt%, the fiber cross sectional shape satisfies the flatness 3.0-6.0 The gist of the polyester fiber is an elliptical or polygonal shape.
(A) Esterification reaction product (B) comprising sulfonic acid group-containing aromatic carboxylic acid and / or ester-forming derivative thereof, polycarboxylic acid not containing sulfonic acid group and / or ester-forming derivative thereof, polyalkylene glycol Polyalkylene glycol

  Since the polyester fiber of the present invention is a fiber made of polyester containing a specific component, it has excellent hygroscopicity and hygroscopicity and good color tone. And since it contains ceramic fine particles and the cross-sectional shape of the fiber exhibits a flat cross-sectional shape, it is excellent in ultraviolet shielding effect and dry feeling (contact cooling sensation). For this reason, a fabric (product) such as a woven or knitted fabric using the polyester fiber of the present invention is worn in a state of being in direct contact with the skin or close to the skin side, such as an inner, a middle garment, and sports clothing. It can be suitably used for various apparel applications including fields.

  Hereinafter, the present invention will be described in detail.

  The polyester fiber of the present invention is composed of a polymer (polymer (M)) containing polyalkylene terephthalate as the main component and containing component (A) and component (B) as the second component. Especially, it is preferable that the polyester fiber of this invention is comprised only with the polymer (M). That is, the polymer (M) is not a shape (core-sheath type or sea-island type) used only for a part of the fiber, but a single component type in which the entire fiber is composed of the polymer (M). By adopting a single component type, it is possible to prevent bleed-out, outflow, and peeling of moisture-absorbing components during melt spinning, dyeing processing, and even during use, which is a problem with the core-sheath type and sea-island type. It can be set as the fiber excellent in the moisture absorption / release property whose moisture performance lasts for a long period of time.

  Examples of the polyester component mainly composed of polyalkylene terephthalate in the present invention include those composed mainly of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and the like. Note that these polyester components may be copolymerized with isophthalic acid, sulfoisophthalate, ethylene oxide adducts of bisphenols, etc., as long as the purpose and effect are not impaired.

  Next, components (A) and (B) will be described. Components (A) and (B) are moisture absorption / release components.

  Component (A) is a sulfonic acid group-containing aromatic carboxylic acid and / or an ester-forming derivative thereof (A-1), a polycarboxylic acid not containing a sulfonic acid group and / or an ester-forming derivative thereof (A-2) , An esterification reaction product comprising polyalkylene glycol (A-3), and containing all of (A-1) to (A-3) as component (A). Component (B) is polyalkylene glycol.

  First, the component (A) will be described. Polyalkylene glycol has high hygroscopicity due to the hydration power of the ether bond and terminal hydroxyl group, but even if it is simply blended with polyester, it is inferior in spinnability and light resistance. In addition, sulfonic acid groups contained in sulfonic acid group-containing aromatic carboxylic acids and their ester-forming derivatives also have high hygroscopicity due to hydration power, but they are low molecular weight compounds by themselves and are therefore used during melt spinning and dyeing. Bleed-out occurs during post-processing such as processing.

  Therefore, bleedout can be suppressed by polycondensation of a sulfonic acid group-containing aromatic carboxylic acid and / or its ester-forming derivative and polyalkylene glycol as an esterification reaction product. A synergistic effect that moisture absorption and desorption is further improved due to the close proximity of the bonding portion is obtained.

  Furthermore, by polycondensing polycarboxylic acid excellent in compatibility with polyalkylene terephthalate, which is the main component constituting the fiber, with polyalkylene glycol and sulfonic acid group-containing aromatic carboxylic acid and / or ester-forming derivative thereof. , Compatibility with the main component polyalkylene terephthalate is improved, bleed-out is less likely to occur during post-processing such as melt spinning and dyeing, and it is possible to prevent outflow and exfoliation of hygroscopic components during use .

  Examples of the sulfonic acid group-containing aromatic carboxylic acid and its ester-forming derivative (A-1) constituting component (A) include 5-sulfoisophthalic acid, 2-sulfoterephthalic acid, and salts thereof (sodium salt, potassium salt) Etc.), lower alkyl (having about 1 to 4 carbon atoms) esters of these aromatic dicarboxylic acids, salts thereof, acid anhydrides and the like. Of these, 5-sulfoisophthalic acid sodium salt and 5-sulfoisophthalic acid sodium salt diethylene glycol ester (hereinafter SIPG) are preferred. Only one of the sulfonic acid group-containing aromatic carboxylic acid and its ester-forming derivative may be used or both may be used in combination. Moreover, only one type of component may be used, or a plurality of types may be used in combination.

  Polycarboxylic acids that do not contain a sulfonic acid group constituting the component (A) and their ester-forming derivatives (A-2) include aliphatic dicarboxylic acids such as succinic acid, adipic acid, and sebacic acid, isophthalic acid, and terephthalic acid. Aromatic dicarboxylic acids such as these, lower alkyl (having about 1 to 4 carbon atoms) esters, acid anhydrides and the like of these polycarboxylic acids. Only one of the polycarboxylic acid not containing a sulfonic acid group and its ester-forming derivative may be used, or both may be used in combination. Moreover, only one type of component may be used, or a plurality of types may be used in combination.

  Examples of the polyalkylene glycol (A-3) constituting the component (A) include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and ethylene oxide / propylene oxide copolymer. PEG) is preferred. The number average molecular weight of the polyalkylene glycol is preferably 1000 to 30000, and more preferably 2000 to 22000. A plurality of types having different number average molecular weights may be used in combination. If the number average molecular weight is lower than 1000, the thermal stability and bleed-out resistance are inferior, and if the number average molecular weight exceeds 30000, the esterification reaction is difficult to proceed.

  The number average molecular weight is measured by gel permeation chromatography (GPC) using tetrahydrofuran as a solvent.

  The component (A) can be obtained by subjecting the above-mentioned three components [(A-1) to (A-3)] to an esterification reaction in the same manner as in a normal polyester production method. As a polymerization catalyst used for the polymerization reaction, known catalysts such as antimony trioxide, tetrabutyl titanate, dibutyltin oxide, germanium dioxide can be used, and among them, tetrabutyl titanate is preferable.

  As each content in a component (A), (A-1) is 5-35 mol%, (A-2) is 5-45 mol%, (A-3) is 50-90 mass%. It is preferable.

  And the number average molecular weight of a component (A) has preferable 1000-30000, and 4000-20000 are especially preferable. If the number average molecular weight is less than 1000, the thermal stability and bleed-out resistance are deteriorated, which is not preferable. If it exceeds 30000, the melt viscosity becomes high, and it tends to be difficult to disperse it uniformly in the main component.

  Examples of the component (B) include PEG, polypropylene glycol, polytetramethylene glycol, ethylene oxide / propylene oxide copolymer, and among them, PEG is preferable. The number average molecular weight of the polyalkylene glycol is preferably from 1000 to 30000, more preferably from 4000 to 20000. If the number average molecular weight is less than 1000, the thermal stability tends to be poor, and if the number average molecular weight exceeds 30000, the melt viscosity becomes high and the component (A) and the component (B) can be mixed uniformly. It tends to be difficult.

  The mass ratio of component (A) to component (B) is preferably 5:95 to 95: 5, more preferably 10:90 to 90:10. If the mass ratio of the component (A) is less than 5, the compatibility with the main component tends to be inferior. On the other hand, if the mass ratio of the component (A) exceeds 95, the component (B) is reduced and the hydroxyl group is reduced. Since it decreases, the moisture absorption / release performance of the resulting fiber tends to be poor.

  Furthermore, the total content of the component (A) and the component (B) in the polyester fiber of the present invention is 1 to 20% by mass, and preferably 5 to 15% by mass. When these contents are less than 1% by mass, the fibers do not have sufficient moisture absorption / release performance. On the other hand, when it exceeds 20% by mass, the melt viscosity of the polymer (M) is remarkably lowered, and the yarn operability is deteriorated.

  In the polyester fiber of the present invention, as the state in which the main component and the components (A) and (B) as the second component are contained, the main component and the components (A) and (B) are copolymerized. Both the state and the state in which the main component and the components (A) and (B) are mixed (blended) are included. Among them, it is preferable to mix components (A) and (B) in advance to obtain a mixture (C). And it is preferable to set it as the state in which the mixture (C) was mixed or copolymerized in the main component, and it is preferable to set it as the state in which the mixture (C) was mixed in the main component.

  The method for obtaining the mixture (C) composed of the components (A) and (B) is not particularly limited, but mixing at 80 to 120 ° C. for 1 to 4 hours using a mixing device such as a mixer. Can be manufactured.

  Moreover, the polyester fiber of this invention contains 1.0-8.0 mass% of ceramic fine particles, and it is preferable to contain 1.5-6.0 mass% especially. By containing the ceramic fine particles, the weight feeling of the fibers can be increased, and at the same time, excellent permeability and ultraviolet shielding effect can be imparted.

Furthermore, the specific heat capacity of ceramic fine particles and water is higher than that of polyester (for example, titanium dioxide is 520 J / (kg · K), polyester is 270 J / (kg · K), water is 4184 J / (kg · K)), polyester The thermal conductivity of ceramic fine particles and water is higher than for example (21.9 W / (m · K) for titanium dioxide, 1.47 × 10 ^-5 W / (m · K) for polyester, 0.59 W / (m for water)・ K)). As a result, in a normal environment (25 ° C., 60% RH), the fiber contains a large amount of ceramic fine particles, so that the thermal conductivity increases and a dry feeling is exhibited. In a hot and humid environment (eg 34 ° C, 90% RH), in addition to the dry feeling of ceramic fine particles, the moisture absorbed in the fibers takes in moisture released by perspiration, and the temperature of the human body due to the high specific heat capacity of water Since the rise is suppressed and the temperature of the clothes is further lowered by the evaporation heat of water, the effect of drastically improving the dry feeling appears.

  When the content of the ceramic fine particles is less than 1.0% by mass, the anti-permeability, the ultraviolet shielding effect and the dry feeling are inferior. On the other hand, if the content exceeds 8.0% by mass, there are operational problems in which yarn breakage, fluff and the like occur, which is not preferable. The ceramic fine particles can be added at the time of melting the polyester during polymerization or spinning, but it is preferable to add at the time of polymerization in consideration of preventing aggregation and dispersing more uniformly.

  The average particle size of the ceramic fine particles is preferably 0.1 to 2.0 μm, and more preferably 0.2 to 1.8 μm. When the average particle size of the ceramic fine particles is 0.1 μm or less, secondary aggregation of the ceramic fine particles proceeds, and not only the operability is deteriorated, but also the dyeing quality of the obtained fibers is liable to be deteriorated. Furthermore, even if secondary aggregation can be suppressed, if the particle size is too small, visible light will pass through, which tends to be inferior in concealment.

  On the other hand, if it exceeds 2.0 μm, the frictional resistance becomes large because the particles are locally exposed to a large extent, and in extreme cases, the particles are localized. This is not preferable because operational problems such as generation of fluff at the time of stretching occur.

The density of the ceramic fine particles is preferably 3.5 g / cm ³ or more. If the density is lower than 3.5 g / cm ^{3, the} effect of increasing the density of the fiber is poor, and if it is included in a large amount to increase the density, yarn breakage may occur during spinning, and fluffing may occur during stretching and processing May cause problems in operability.

  The ceramic fine particles used in the present invention are not particularly limited, and titanium dioxide, alumina, silica, and the like can be used. Among them, titanium dioxide is preferable as being particularly excellent in permeation resistance and ultraviolet shielding effect.

  Furthermore, the polyester fiber of the present invention needs to have an elliptical or polygonal shape in which the fiber cross-sectional shape satisfies a flatness of 3.0 to 6.0. By setting it as such a flat cross-sectional shape, when making it into a textile fabric, the area which contacts a skin becomes larger than a round cross-section thread | yarn, and it can improve a contact cooling sensation effect. Moreover, since it becomes a high-density woven or knitted fabric, the ultraviolet shielding effect is superior to that of a round cross-section yarn containing the same amount of ceramic fine particles.

Examples of the polygonal shape that satisfies the flatness of 3.0 to 6.0 include triangles, quadrangles, pentagons, hexagons, octagons, and the like.
And in this invention, the shape of the cross section of the single yarn cut | disconnected perpendicularly | vertically with respect to the length direction of a fiber is called fiber cross-sectional shape. For both elliptical and polygonal fiber cross-sectional shapes, the longest length in the fiber cross-sectional shape is L1, the longest length of straight lines orthogonal to L1 is L2, and flatness = (L1 / L2) Is to be calculated.

  Here, the cross-sectional shape of the polyester fiber of the present invention will be described with reference to the drawings. 1-3 is a schematic diagram showing an example of the fiber cross-sectional shape of the polyester fiber of the present invention.

  1 shows an elliptical fiber cross-sectional shape, FIG. 2 shows a triangular fiber cross-sectional shape, and FIG. 3 shows a quadrangular fiber cross-sectional shape.

  The flatness is preferably 3.0 to 6.0, and more preferably 3.5 to 5.0. When the flatness is lower than 3.0, it becomes close to a round cross-sectional shape, the contact cooling sensation effect is lowered, and the ultraviolet shielding property is inferior. When the flatness is higher than 6.0, spinning and drawing properties deteriorate, and it becomes difficult to obtain good operability, and the texture of the resulting fabric becomes too paper-like.

  The flatness of the polyester fiber of the present invention can be adjusted by changing the slit shape of the spinneret of the spinneret or changing the melt viscosity of the polymer and the content of ceramic fine particles. It can also be adjusted by cooling, heat treatment conditions, etc. in the spinning and drawing processes.

And it is preferable that the polyester fiber of this invention satisfies simultaneously following formula (1)-(4) which shows a moisture content as an index | exponent which shows moisture absorption / release property.
Moisture content (W1) (%): [(P−R) / R] × 100 = 1.5 to 10.0 (1)
Moisture content (W2) (%): [(Q−R) / R] × 100 = 0.6 to 4.0 (2)
W1−W2 ≧ 0.9 (3)
W1 / W2 ≧ 2.4 (4)
In addition, after 5 g of fiber is immersed in hot water at 130 ° C. for 30 minutes while being in a tubular shape or in fiber, the mass after drying for 24 hours at 105 ° C. with a hot air dryer is defined as (R). Next, the mass after treating for 24 hours under conditions of 34 ° C. and 90% RH using a constant temperature and humidity chamber (humidity chamber manufactured by Yamato Scientific Co., Ltd., model number IG420) is defined as (P). Subsequently, the mass after treatment for 2 hours at 25 ° C. and 60% RH is defined as (Q).

  The formula (1) is an index mainly indicating the hygroscopicity of the fiber, and indicates how much moisture can be absorbed when the condition is set to 34 ° C. and 90% RH from the absolutely dry state. The condition of 34 ° C. and 90% RH is similar to the condition near the skin when a person wearing clothes exercises and sweats.

The polyester fiber of the present invention has improved hygroscopicity by containing the component (A) and the component (B), and the value of the formula (1) is preferably 1.5 to 10.0, and more preferably 2.0 to 8.0. Preferably there is. When the value of the formula (1) is less than 1.5, it is likely that the material does not have sufficient moisture absorption performance. On the other hand, if this value exceeds 10.0, the total content of the component (A) and the component (B) needs to exceed 20% by mass, and the melt viscosity of the polymer (M) is remarkably lowered, and the spinning operation It is not preferable because the properties deteriorate.
In addition, normal polyester fiber does not have hygroscopicity, and the value of (1) Formula is about 0.1-0.6.

  The formula (2) is an index mainly indicating the moisture releasing property of the fiber, and indicates the degree to which moisture absorbed when the condition is set to 34 ° C. and 90% RH from the absolutely dry state. The condition of 25 ° C. and 60% RH is similar to the condition close to the external environment when a person lives in a normal state.

  The polyester fiber of the present invention improves the hygroscopicity as well as the hygroscopicity by containing the component (A) and the component (B), and the value of the formula (2) is preferably 0.6 to 4.0. Of these, 0.8 to 3.2 is preferable. That is, the polyester fiber of the present invention absorbs a large amount of moisture such as sweat when a person wearing clothes exercises and sweats, and after the exercise, the moisture absorbed is quickly released. Thus, the comfort when wearing clothes is improved.

  When the value of the formula (2) exceeds 4.0, it tends to be a product that does not have sufficient moisture release performance. On the other hand, in order to make this value less than 0.6, the total content of the component (A) and the component (B) needs to be less than 1% by mass, and the formula (1) cannot be satisfied. .

  And as for (3) Formula, it is preferable that W1-W2 which is the difference of the value of (1) Formula and (2) Formula is 0.9 or more. If W1-W2 is less than 0.9, either the hygroscopic property or the hygroscopic property is inferior, and the hygroscopic property tends to be inferior. The upper limit of W1-W2 is preferably 9.0 in view of the contents of the component (A) and the component (B) in the fiber, and more preferably 8.0.

  Furthermore, the formula (4) shows that the formula (1) is preferably 2.4 times or more of the formula (2). When W1 / W2 is less than 2.4, it does not have sufficient moisture absorption / release properties. For example, even for a fiber having hygroscopicity such as cotton (water content 8.5% at 25 ° C., 60% RH), W1 / W2 is about 1.5. If W1 / W2 is 4.8 or more, the hygroscopic property becomes too high, and the fiber may be cracked during moisture absorption, which is not preferable.

  Furthermore, the polyester fiber of the present invention preferably has an L value indicating the color tone of the fiber of 85 or more and a b value of 5.0 or less, more preferably an L value of 91 or more and a b value of 4.0 or less.

  In the polyester fiber of the present invention, since the component (A) and the component (B) comprising specific components are used as the hygroscopic component, the single-component structure comprising the polymer (M) ) Is present on the fiber surface, it is possible to obtain a fiber having excellent light resistance and excellent color tone.

  The L value is an index indicating the whiteness of the color, the b value is an index indicating the yellowness of the color, and when the L value is less than 85, the color becomes blackish. When it exceeds 5.0, the yellowish color becomes too strong. Therefore, when the L value is less than 85 or the b value exceeds 5.0, the appearance color tone is inferior and the quality is low both when the filament yarn is used as a raw yarn or as a fabric.

  In addition, L value and b value in the present invention are those obtained by measuring the L value and b value with a color difference meter CR-300 manufactured by MINOLTA, by overlapping the obtained fibers (not dyed). It is.

  The single yarn fineness of the polyester fiber of the present invention can be appropriately selected, and is preferably 0.1 to 20 dtex. Even if the single yarn fineness is reduced, the fiber of the present invention is a fiber in which a hygroscopic resin is uniformly dispersed, so that the spinning operability is not extremely deteriorated. . If it exceeds 20 dtex, the melt viscosity of the hygroscopic resin is lower than that of the polyester resin.

  The fiber form of the present invention may be produced by any method such as filaments, staples, spun yarn obtained by spinning staples with a fine spinning machine.

  The polyester fiber of the present invention includes various pigments, dyes, colorants, water repellents, water absorbents, flame retardants, stabilizers, antioxidants, ultraviolet absorbers, metal particles, inorganic compound particles, crystal nucleating agents, lubricants, Plasticizers, antibacterial agents, fragrances and other additives can be mixed depending on the intended use.

  Next, using an example of the method for producing the polyester fiber of the present invention (when mixing the component (A) and the component (B) to create a mixture (C) and mixing the mixture (C) into the main component)) explain.

First, the mixture (C) is produced by mixing the component (A) and the component (B) at 80 to 120 ° C. for 1 to 4 hours using a kneader such as a mixer. Next, examples of the method for mixing the main component and the mixture (C) include the following methods.
1. A method in which the main component and the mixture (C) are dry blended in advance and fed to a single melt spinning machine.
2. A method in which a main component and a mixture (C) are blended with a melt kneader to produce a chip having a target concentration, and then the chip is supplied to a normal melt spinning machine.
3. A method in which a master chip is prepared so that the mixture (C) has a high concentration of the main component and the mixture (C), and then the master chip and the polyester component are dry blended and supplied to a single melt spinning machine.
4). A method in which the master chip (mixture (C) contains a high concentration) and the main component are supplied to separate melt spinning machines and blended in a polymer line or nozzle pack after melting.
5. A method in which the main component and the mixture (C) are supplied to separate melt spinning machines and blended in a polymer line or nozzle pack after melting.

  The ceramic fine particles are preferably added in the form of an ethylene glycol dispersion at the time of polymerization of the main polyester, because secondary aggregation can be suppressed. However, the method of adding the ceramic fine particles during the production of the mixture (C) or the ceramic fine particles are mainly used. It is possible to adopt a method in which a master chip is added in advance to the component polyester in a high concentration and added at the time of spinning.

  As described above, the mixture (C) and ceramic fine particles are mixed and melted polymer is measured by a metering pump, and discharged from a discharge hole. At this time, a fiber having a flat cross-sectional shape can be obtained by forming the spinning hole of the spinneret into a rectangular slit shape. And after cooling the yarn using a known cooling device such as a horizontal spraying device or an annular spraying device, after applying the oil agent, converging with a converging guide, and confounding if necessary Once wound up with a take-up machine. Next, this fiber is drawn using a normal drawing device to obtain the polyester fiber of the present invention.

  In addition, the polyester fiber of the present invention is melt-spun with a low-speed spinning of less than 2000 m / min as described above, and not only a two-step method in which a wound yarn is drawn and heat-treated, but also by a high-speed spinning of 2000 m / min or more, It may be obtained by a POY method of winding as a semi-undrawn yarn or a spin draw method of once spinning at a high speed of 2000 m / min or more and then drawing without winding.

Next, the present invention will be specifically described with reference to examples. In addition, the measuring methods, such as a characteristic value in an Example, are as follows.
(1) Intrinsic viscosity [η]
An equimass mixed solution of phenol / ethane tetrachloride was used as a solvent, and measurement was performed at a temperature of 20 ° C. using an Ubbelohde viscometer.
(2) Number average molecular weight It was measured by the method described above.
(3) Strong elongation Using a Tensilon RTC-1210 model manufactured by Orientic Co., Ltd., a stress-elongation curve was measured at a sample length of 500 mm and a tensile speed of 500 mm / min, and the strength and elongation were obtained from the maximum point strength of the fiber.
(4) Yarn operability
Evaluation was made based on the number of cut yarns when spinning with 16 spindles for 24 hours, and ○ and Δ were accepted criteria.
0 times: ○, 1-2 times: △, 3 times or more: ×
(5) Moisture absorption / release performance Using the obtained fiber, W1 and W2 were measured and calculated by the above method. In addition, 5g of the obtained fiber is knitted and dyed for 30 minutes using TerasilNavy Blue SGL (Ciba specialty chemicals) under the conditions of 1% omf, bath ratio 50: 1, 130 ° C, and then a hot air dryer. The mass after drying at 105 ° C. for 24 hours was defined as (R).
(6) L value, b value Measured by the method described above.
(7) Evaluation of dry feeling (contact cold feeling) Using the obtained fiber (42dtex / 24fil drawn yarn) for both warp and weft, warp density 217 / 2.54cm, weft density 130 / 2.54cm in plain weave structure Weaving and sensory evaluation were performed in three stages by 10 panelists, and the most common evaluation (adopting excellent evaluation in the case of the same number) was used as the sample evaluation. In addition, as a sample to be compared, a fiber woven in the same manner using a round cross-section fiber (42 dtex / 24fil drawn yarn) made of PET containing the same amount of titanium dioxide as in Example 1 was used.
○: Excellent dry feeling (contact cooling) Δ: Slightly excellent dry feeling (contact cooling)
X: Inferior to dry feeling (contact cooling sensation) (8) Evaluation of anti-permeability The sample (plain fabric) used in the evaluation of (7) above was visually evaluated in three stages by 10 panelists. . The most frequent evaluation (adopting excellent evaluation in the case of the same number) was taken as the evaluation of the sample.
○: Good Δ: Slightly transparent ×: Transparent (9) Ultraviolet ray shielding property The sample (plain fabric) used in the evaluation of (7) was evaluated. The evaluation method uses an ultraviolet lamp (400W high-pressure metal highland lamp: ELC4000 manufactured by Funakoshi Co., Ltd.) as a light source, and an ultraviolet sensor SUV-T (manufactured by Toray Techno Co., Ltd., hereinafter referred to as UV sensor) for ultraviolet light in the wavelength range of 260-390 nm Then, integrated measurement was performed for 15 minutes, and the following formula was calculated. The lower the ultraviolet transmittance, the better the ultraviolet shielding property.
UV transmittance = UV2 / UV1 x 100 (%)
UV1: UV light without a sample on the UV sensor
UV2: The amount of UV light that passes through the sample placed on the UV sensor
(10) Dyeing quality The sample (plain fabric) used in the evaluation in (7) above was dyed, and the dyeing spots were visually evaluated in three stages by 10 panelists. The most common evaluation (in the case of the same number) Adopting excellent evaluation) was taken as the evaluation of the sample.
○: Good △: Some spots ×: Large spots

Example 1
[Production of mixture (C)]
In a polycondensation reaction vessel, 830 parts of PEG with a number average molecular weight of 8300 (PEG-6000S manufactured by Sanyo Chemical Industries), 108 parts of SIPG in 40% ethylene glycol solution (PIPE-40L manufactured by Sanyo Chemical Industries), 29 parts of adipic acid, 10 parts of isophthalic acid, 9 parts of “Irganox 245” (Ciba Specialty Chemicals, hindered phenol antioxidant) as an antioxidant, 0.2 part of tetrabutyl titanate, and 190 parts under 5 mmHg vacuum The temperature was raised to ° C.
Under these conditions, an ester exchange reaction was performed for 12 hours while removing excess ethylene glycol and water to obtain an esterification reaction product (component (A)). Next, 226 parts of PEG having a number average molecular weight of 20000 (PEG-20000, manufactured by Sanyo Kasei Kogyo Co., Ltd.) was added as a component (B) and melt-mixed at 100 ° C. for 2 hours to obtain a mixture (C).
[Manufacture of moisture-absorbing and releasing polyester fibers]
After using poly (ethylene terephthalate) as the main component, polyethylene terephthalate (PET) containing a melting point of 255 ° C, an intrinsic viscosity of 0.68, and 2.0% by mass of titanium dioxide. The mixture was dry blended so that the ratio of the mixture (C) in the fiber was 5.0% by mass, supplied to a melt extruder, and melt kneaded at 285 ° C. Subsequently, the polymer was discharged from a die heated to 290 ° C., and semi-undrawn yarn (POY) was wound off at a speed of 3500 m / min to obtain a 61 dtex / 24fil multifilament (POY). As the spinneret, a spinneret having 24 perforated holes (rectangular slit shape with a ratio of length to width = length: width = 1:10) was used. Next, this was drawn using a normal drawing apparatus under conditions of a drawing speed of 700 m / min and a draw ratio of 1.45 times to obtain a drawn yarn (FDY) of 42 tex / 24 fil. The obtained fiber had an elliptical shape as shown in FIG.

Example 2
As the polyalkylene terephthalate as the main component, a PET containing a melting point of 255 ° C., an intrinsic viscosity of 0.72 and 2.0% by mass of titanium dioxide was used, and the mass ratio of PET to the mixture (C) obtained in Example 1 was 80:20. Then, the mixture was fed to a twin-screw extruder, melt-kneaded and then extruded into a pellet to produce a master chip containing 20% by mass of the mixture (C). This master chip and PET (melting point 255 ° C., intrinsic viscosity 0.68, titanium dioxide 2.0% by mass) were dry blended to a mass ratio of 25:75 and supplied to the melt extruder as in Example 1. And polyester fiber of 42tex / 24fil was obtained.

Example 3
The master chip prepared in Example 2 and PET (melting point 255 ° C., intrinsic viscosity 0.68, titanium dioxide 2.0% by mass) were respectively supplied to separate melt extruders, and the polymer melt-kneaded at 285 ° C. was combined with the master chip and PET. Was measured with a gear pump so that the mass ratio was 25:75, and then merged in the nozzle pack, passed through a static kneader (15 stages of Noritake Co. static mixer) incorporated in the nozzle pack, and then 295 The polymer was discharged from the die heated to ° C. Then, semi-undrawn yarn (POY) was wound up at a speed of 3500 m / min to obtain a 61dtex / 24fil multifilament (POY). As the spinneret, a spinneret having 24 perforated holes (rectangular slit shape with a ratio of length to width = length: width = 1:10) was used. Subsequently, this was drawn 1.45 times at a speed of 700 m / min using a normal drawing apparatus to obtain a polyester fiber of 42 tex / 24fil.

Examples 4-6, Comparative Examples 1-2
Except that the content of the mixture (C) was changed as shown in Table 1, it was carried out in the same manner as in Example 1 to obtain a 42tex / 24fil polyester fiber.

Examples 7-8, Comparative Examples 3-4
As the polyalkylene terephthalate as the main component, PET having a melting point of 255 ° C. and an intrinsic viscosity of 0.68 was used, and the content of titanium dioxide was changed so that the content of titanium dioxide in the fibers became the value shown in Table 1. Was carried out in the same manner as in Example 1 to obtain a 42tex / 24fil polyester fiber.

Examples 9-10, Comparative Examples 5-6
Except for changing the slit shape (length / width ratio) of the spinneret of the spinneret and adjusting the flatness to the values shown in Table 1, the same procedure as in Example 1 was performed. Polyester fibers were obtained.

Comparative Example 7
A 42 tex / 24 fil polyester fiber was obtained in the same manner as in Example 1 except that only polyethylene terephthalate (PET) having a melting point of 255 ° C. and an intrinsic viscosity of 0.68 was used and the mixture (C) was not added.

Comparative Example 8
A 42 tex / 24 fil polyester fiber was obtained in the same manner as in Example 1 except that the slit shape of the spinneret of the spinneret was changed to a circular cross-sectional shape. The obtained fiber was a circular fiber having a cross-sectional shape of 1.0 and a flatness of 1.0.

  Table 1 shows various characteristic values of the polyester fibers obtained in Examples 1 to 10 and Comparative Examples 1 to 8 and the evaluation results of the yarn operability.

  As is clear from Table 1, the polyester fibers of Examples 1 to 10 were excellent in moisture absorption / release properties, color tone, ultraviolet shielding property, concealing property, and dry feeling, and also excellent in yarn production operability.

  On the other hand, the polyester fiber of Comparative Example 1 was inferior in moisture absorption / release and dry feeling because the content of the mixture (C) was small. Since the polyester fiber of Comparative Example 2 contained a large amount of the mixture (C), the yarn maneuverability was remarkably deteriorated, and the yarn quality characteristics such as high elongation and the dyeing quality were inferior. Since the polyester fiber of Comparative Example 3 had a low content of titanium dioxide, the polyester fiber was inferior in dry feeling, permeation resistance, and ultraviolet shielding properties. Since the polyester fiber of Comparative Example 4 contained too much titanium dioxide, it was inferior in yarn maneuverability, dyeing quality, and color tone. Since the polyester fiber of Comparative Example 5 had a low flatness, it was inferior in dry feeling, permeation resistance, and ultraviolet shielding property. Since the polyester fiber of Comparative Example 6 was too flat, it was inferior in yarn maneuverability and inferior in ultraviolet shielding properties and dyeing quality. Since the polyester fiber of Comparative Example 7 did not contain the mixture (C), it was inferior in moisture absorption / release and dry feeling. Since the polyester fiber of Comparative Example 8 had a round cross-sectional shape, it was inferior in dry feeling, permeation resistance, and ultraviolet shielding properties.

It is a cross-sectional schematic diagram of the single yarn which shows one embodiment of the polyester fiber of this invention. It is a cross-sectional schematic diagram of the single yarn which shows the other embodiment of the polyester fiber of this invention. It is a cross-sectional schematic diagram of the single yarn which shows the other embodiment of the polyester fiber of this invention.

Claims (3)

A main component polyalkylene terephthalate, a polyester fiber composed of a polymer containing as a second component and below (A) a mixture of (B) (C), in the fibers of (C) including Yuryou 1 to 20% by mass, 1.0 to 8.0% by mass of ceramic fine particles in the fiber, and the cross-sectional shape of the fiber is an ellipse or polygonal shape satisfying a flatness of 3.0 to 6.0 A polyester fiber characterized by being.
(A) Esterification reaction product (B) comprising sulfonic acid group-containing aromatic carboxylic acid and / or ester-forming derivative thereof, polycarboxylic acid not containing sulfonic acid group and / or ester-forming derivative thereof, polyalkylene glycol Polyalkylene glycol Polyester fiber of claim 1 Symbol mounting satisfy the following equation indicating the water content of (1) to (4) simultaneously.
Moisture content (W1) (%): [(P−R) / R] × 100 = 1.5 to 10.0 (1)
Moisture content (W2) (%): [(Q−R) / R] × 100 = 0.6 to 4.0 (2)
W1-W2 ≧ 0.9 (3)
W1 / W2 ≧ 2.4 (4)
In addition, after 5 g of fibers are immersed in hot water at 130 ° C. for 30 minutes in the form of tubular braids or fibers, the mass after drying for 24 hours at 105 ° C. in a hot air dryer is defined as (R). Next, the mass after treating for 24 hours under conditions of 34 ° C. and 90% RH using a constant temperature and humidity chamber is defined as (P). Then, let the mass after processing for 2 hours on 25 degreeC and 60% RH conditions be (Q). L value which shows the color tone of a fiber is 85 or more, and b value is 5.0 or less, The polyester fiber in any one of Claims 1-2 .