JP3072907B2 - Underwear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is composed of a novel copolymerized polyester fiber, does not decrease in water absorption even after repeated washing, and has excellent durability, water absorption, sweat absorption and heat retention. And a cotton-like underwear with a tactile sensation.

<Conventional Technology> Conventionally, underwear has been widely used from the viewpoint of sweat absorption and water absorbency, such as woven fabrics and knitted fabrics of fibers mainly composed of cotton, regenerated cellulose fibers and the like.

Further, when synthetic fibers such as polyester fibers are used as underwear, a hydrophilicity-imparting agent is applied to the moisturizing synthetic fibers or the synthetic fiber cloth to impart hydrophilicity.

<Problems to be Solved by the Invention> Conventional underwear is a fiber cloth mainly composed of cellulosic fibers. However, depending on the wearing environment and the factors of the wearer, generation of mold, wet feeling due to sweat, etc. There was a usage problem. On the other hand, synthetic fiber undergarments do not have sufficient sweat absorbency and water absorbency, which is not desirable in terms of skin hygiene. Had.

Further, in the case of producing colored underwear for imparting a fastness property, there is a problem in producing a product having high color fastness, particularly washing fastness and light fastness, with a cellulosic fiber fabric.

SUMMARY OF THE INVENTION An object of the present invention is to provide an undergarment which has high water absorbency and sweat absorbency, does not reduce the water absorbency even upon repeated washing, enables clear dyeing, and has excellent dyeing fastness.

<Means for Solving the Problems> The present inventors have conducted intensive studies to provide underwear made of water-absorbing polyester fibers having excellent durability, and as a result, they have been incorporated into polyester molecules constituting the fibers. The balance between the hydrophobic group and the hydrophilic group of the hydrophilizing agent determines the surface wettability of the copolymerized polyester and the surface wettability and water absorption in the form of an aggregate such as a cloth for underwear when formed into fibers. The present invention has been found to be an important element to achieve the present invention. Mainly, dicarboxylic acid unit, diol unit and general formula Wherein, x and y each represents 0 or 1, Z is wherein _{-O- (R 2 -O) n-} R 1 (II) ( wherein, R ₁ represents a hydrocarbon group having 3 to 18 carbon atoms And R ₂ represents an alkylene group, and n is a number of 15 to 25 representing an average degree of polymerization. Determined by the Davis method for the compound represented by
A monovalent group having an HLB value of 5.0 or more], wherein the content of the structural unit represented by the general formula (I) is 1 to 50% by weight, and phenol and tetra This is an undergarment using fibers composed of a copolymerized polyester having an intrinsic viscosity of 0.5 to 1.5 dl / g at 30 ° C. in a mixed solvent of chloroethane in the same weight as a main constituent fiber.

The fiber used in the present invention is composed of a specific copolymerized polyester as described above, and a dicarboxylic acid unit, which is one of the essential structural units of the copolymerized polyester, has two carboxyl groups in the dicarboxylic acid. A structural unit excluding two hydroxyl groups. (Wherein, R ₃ represents a divalent organic group or a single bond). Examples of the divalent organic group represented by R ₃ include a divalent aromatic hydrocarbon group such as a p-phenylene group, a m-phenylene group, a naphthalenediyl group, a (biphenyl) diyl group; an octamethylene group; A divalent aliphatic hydrocarbon group such as a tetramethylene group; and a divalent hydrocarbon group such as a divalent alicyclic hydrocarbon group such as a 1,4-cyclohexylene group. In the present invention, the dicarboxylic acid unit contained in the copolymerized polyester may be only one type or two or more types. From the viewpoint of obtaining a polyester, it is desirable that 70 mol% or more of the dicarboxylic acid units are terephthaloyl groups.

The diol unit, which is one of the essential structural units of the copolymerized polyester constituting the fiber used in the present invention, is a structural unit in which two hydrogen atoms in two hydroxyl groups are removed from a diol, and (wherein, R ₄ represents a divalent organic group) wherein -O-R ₄ -O- is shown in. Examples of the divalent organic group represented by R ₄ include an ethylene group, a trimethylene group, a tetramethylene group, a pentamethylene group, a hexamethylene group, a 2,2-dimethyltrimethylene group, a 3-methylpentamethylene group, and a nonamethylene group. A divalent aliphatic hydrocarbon group such as a 2-methyloctamethylene group; a divalent alicyclic hydrocarbon group such as a dimethylcyclohexane α, α'-diyl group; 2,2-diphenylpropane-4 ', 4 ″ -diyl group, diphenylsulfone-4,
Examples thereof include a divalent aromatic group such as a 4'-diyl group. The copolymer polyester of the present invention may contain only one type of diol unit or two or more types of diol units. However, it is possible to obtain a copolymer polyester having excellent mechanical performance required for fiber use. From the viewpoint that 70 mol% or more of the diol unit has 2 to 6 carbon atoms such as ethylenedioxy group, trimethylenedioxy group, tetramethylenedioxy group, pentamethylenedioxy group, and hexamethylenedioxy group. Is a divalent structural unit obtained by removing two hydrogen atoms in two hydroxyl groups from a linear alkylene glycol of the formula (1).

The structural unit represented by the general formula (I), which is an essential structural unit of the copolymerized polyester, has a general formula (Wherein, Z is as defined above), a general formula: (Wherein, Z is as defined above), a general formula: (Wherein, Z is as defined above), and the like. The structural unit represented by the general formula (I) generally has an ester bond between them or the dicarboxylic acid unit or the diol unit. Alternatively, it is incorporated into the main chain of the copolymerized polyester by forming an ether bond (-O-). Examples of the hydrocarbon group having 3 to 18 carbon atoms represented by R ₁ in the formula (II) include n-propyl, isopropyl, n-butyl, isobutyl, and sec.
An alkyl group having 3 to 18 carbon atoms such as -butyl, tert-butyl, n-pentyl, n-octyl, 2-ethylhexyl, n-dodecyl, n-stearyl; a cycloalkyl group having 3 to 18 carbon atoms such as cyclohexyl; An aryl group having 3 to 18 carbon atoms such as phenyl and nonylphenyl is preferable. When the number of carbon atoms of the hydrocarbon group R ¹ is 2 or less or 19 or more, excellent in surface wettability ease, not copolyester is obtained which gives the fiber assembly excellent in water absorption and water retention. The alkylene group represented by R ₂ in the formula (II) is preferably an ethylene group, a propylene group in view of the surface wettability of the obtained copolymerized polyester and the high water absorption and water retention of the fiber assembly obtained therefrom. An alkylene group having 2 to 4 carbon atoms such as a group is preferable, and an ethylene group is more preferable. R _{2 represents} a group Z in which two or more alkylene groups are the same.
May coexist inside. N in the formula (II) is a number representing the average degree of polymerization of the polyoxyalkylene moiety, and is a number in the range of 15 to 25. When n is less than 15, a copolyester which is excellent in surface wettability and gives a fiber aggregate excellent in water absorption and water retention cannot be obtained. Further, when n is a number exceeding 25, effects higher than those achieved when n is a number within the range of 15 to 25 are no longer achieved. Since the copolymer polyester that gives a fiber aggregate that is particularly excellent in surface wettability and excellent in water absorption and water retention is obtained by suppressing inconveniences such as coloring as much as possible,
Preferably, the value of n is a number in the range of 20-25. The monovalent group Z in the general formula (I) has not only the structure represented by the formula (II) but also the HLB value of the compound represented by the general formula (III) determined by the Davis method of 5.0.
It is indispensable to satisfy the structural condition of the above number. HLB by the Davis method in the present invention
The price is, for example, JTDavie
s), co-authored by EKRideal, "Interfacial Phenomen
a) Second Edition ”(Academic Press, 1963
Press) (USA) pp. 372-374; Nishi, Imai,
Kasai Co-editor, "Surfactant Handbook" (July 5, 1960, published by Sangyo Tosho Co., Ltd.), page 313; Japan Oil Chemistry Association, "Oil and Fatty Chemistry Handbook Revised Second Edition" (November 30, 1976, Maruzen Co., Ltd.) Issued) As described on page 710, etc., it is derived according to the formula (HLB value) = 7 + (total number of hydrophilic groups) + (total number of lipophilic groups). Here, the numbers of the hydrophilic groups and the lipophilic groups in the representative examples are as follows.

Z in the general formula (I) represents the HLB value of the compound represented by the general formula (III) determined by the Davis method as 5.
When the number is less than 0, the obtained copolymer polyester is not easily wettable on the surface, and the fiber aggregate obtained by using the same cannot exhibit sufficient water absorption and water retention.
Z is determined by the Davis method for the compound represented by the general formula (III) from the viewpoint that the copolymer polyester obtained is particularly easy to wet the surface, and the water absorption and the water retention of the fiber aggregate obtained using the same are particularly enhanced. The obtained HLB value is desirably a number in the range of 7.0 to 15.0, and more preferably a number in the range of 8.0 to 13.5.

General formula (I) contained in the copolymerized polyester of the present invention
The structural unit represented by may be only one type or two or more types. The content of the structural unit is in the range of 1 to 50% by weight based on the copolymerized polyester. ~ 40
%, Preferably in the range of 3 to 30% by weight. When the content is less than 1% by weight, the obtained copolymerized polyester has insufficient surface wettability, and when it exceeds 50% by weight, the mechanical properties such as the strength of the obtained copolymerized polyester deteriorate. There is a risk.

The copolymerized polyester constituting the fiber used in the present invention mainly comprises a dicarboxylic acid unit, a diol unit and the structural unit represented by the general formula (I) as described above. It may be present in such a small amount that the effect is not lost. Such a structural unit which may optionally have, A p-oxybenzoic acid unit represented by the formula: Is a divalent structural unit in which a hydroxyl group in a carboxyl group and a hydrogen atom in a phenolic or alcoholic hydroxyl group are removed from a hydroxycarboxylic acid, such as a p- (β-oxyethoxy) benzoic acid unit represented by Hydroxycarboxylic acid unit; formula A glycerin unit represented by the formula A triol unit which is a trivalent structural unit in which three hydrogen atoms in three hydroxyl groups are removed from a triol, such as a trimethylolpropane unit represented by the formula: A tetraol unit which is a tetravalent structural unit in which four hydrogen atoms in four hydroxyl groups are removed from tetraol, such as a pentaerythritol unit represented by A trimellitate unit represented by the formula A tricarboxylic acid unit which is a trivalent structural unit in a form in which three hydroxyl groups in three carboxyl groups are removed from a tricarboxylic acid, such as a trimesic acid unit represented by And tetracarboxylic acid units which are tetravalent structural units in which four hydroxyl groups in four carboxyl groups are removed from tetracarboxylic acid, such as a pyromellitic acid unit represented by

In the copolyester constituting the fiber used in the present invention, in an equal weight mixed solvent of phenol and tetrachloroethane, the intrinsic viscosity measured at 30 ° C. is 0.5 to 1.5 dl / g.
Is within the range. If the intrinsic viscosity is less than 0.5 dl / g, the mechanical performance such as strength becomes insufficient,
In addition, the thread breakage when subjected to melt spinning becomes remarkable.
On the other hand, in the case of a copolymerized polyester having an intrinsic viscosity of more than 1.5 dl / g, the melt viscosity may be too large and the spinnability may be poor. The intrinsic viscosity of the copolymerized polyester is preferably in the range of 0.6 to 1.0 dl / g, since the mechanical performance becomes particularly good and troubles in the fiberizing step can be reduced.

The copolyester constituting the fiber used in the present invention is described, for example, in JP-B-43-19037 and JP-A-1-23442.
No. 0, JP-A 1-236236, etc., it is manufactured according to a known method. For example, a dicarboxylic acid corresponding to a desired dicarboxylic acid unit such as terephthalic acid is directly esterified with a diol corresponding to a desired diol unit such as ethylene glycol, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate. The ester-forming derivative of the dicarboxylic acid corresponding to the desired dicarboxylic acid unit and the diol corresponding to the desired diol are subjected to a transesterification reaction, or the dicarboxylic acid corresponding to the desired dicarboxylic acid unit and an alkylene oxide such as ethylene oxide. And a first-stage reaction for producing an ester of a dicarboxylic acid and a diol or a low polymer thereof, and then subjecting the product to polycondensation by heating under reduced pressure to a desired degree of polymerization. Second stage reaction and smell consisting of At any stage of the series of production steps, represented by the general formula: ZA (IV) wherein A represents an organic group having an ester-forming functional group, and Z is as defined above. It is prepared by adding the desired amount of comonomer to the reaction system. Preferred examples of the organic group having an ester-forming functional group represented by A in the general formula (IV) include an organic group having the following structure.

Examples of the comonomer represented by the general formula (IV) include:
For example, polyoxyethylene glycol-n-propyl-glycidyl ether, polyoxyethylene glycol-n-propyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-t-butyl-glycidyl ether, polyoxyethylene glycol-t-
Butyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-octyl-glycidyl ether, polyoxyethylene glycol-n-octyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-2-ethylhexyl-glycidyl ether , Polyoxyethylene glycol-2-ethylhexyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-n-dodecyl-glycidyl ether, polyoxyethylene glycol-n-dodecyl-2,3-dihydroxypropyl ether, polyoxyethylene Glycol-n-stearyl-glycidyl ether, polyoxyethylene glycol-n-stearyl-
2,3-dihydroxypropyl ether, polyoxyethylene glycol-phenyl-glycidyl ether, polyoxyethylene glycol phenyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol
Nonylphenyl-glycidyl ether, polyoxyethylene glycol-nonylphenyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol-cyclohexyl-glycidyl ether, polyoxyethylene glycol-cyclohexyl-2,3-dihydroxypropyl ether, polyoxyethylene glycol / Octyl-glycidyl ether of polyoxypropylene glycol copolymer, octyl-2,3- of polyoxyethylene glycol / polyoxypropylene glycol copolymer
N-dodecyl-glycidyl ether of dihydroxy propyl ether and polyoxyethylene glycol / polyoxypropylene glycol, and n-dodecyl-2,3-dihydroxypropyl ether of polyoxyethylene glycol / polyoxypropylene glycol copolymer One or two or more of these can be selected and used. In addition, at any stage of the above-mentioned series of production steps, dihydroxycarboxylic acid or its ester-forming derivative, triol, tetraol, tricarboxylic acid or its ester-forming derivative, tetracarboxylic acid or its ester-forming derivative, and the like A small amount of a comonomer providing a structural unit which the copolymerized polyester of the present invention may optionally have may be added to the reaction system.

The copolyester fiber constituting the present invention may contain any additives as necessary, for example, a catalyst, a coloring inhibitor, a heat stabilizer, a fluorescent bleach, a flame retardant, an antioxidant, a matting agent, a coloring agent, and an inorganic material. Fine particles and the like may be contained. In particular, it is preferable to add an antioxidant or a fluorescent bleaching agent because the polyoxyalkylene chain portion may be oxidized under high-temperature conditions such as melt-spinning conditions to cause some inconvenience such as reduction in degree of polymerization or coloring. May give results.

The reason why the copolymerized polyester fiber constituting the present invention exhibits excellent water absorption cannot be clearly explained at present, but as described above, when the monomer of the formula (IV) is copolymerized, it hangs as a side chain group. This is probably because the polyoxyalkylene chain is effectively exhibiting the effect. By setting an appropriate HLB value and length (n = 15 to 25) of the side chain portion in the course of studying in the present invention, it is possible to maintain a more effective water-absorbing effect and good fiberization processability. Polymerized polyesters have been found for the first time.

Also, when a component such as a linear polyalkylene glycol is copolymerized, the copolymerization amount must be considerably increased in order to obtain the desired water absorption performance level, and at the same time, the polymer physical properties are significantly reduced in crystallinity. The heat resistance during spinning is also extremely lowered, and the heat resistance during spinning is poor, so that the spinnability is remarkably deteriorated and the obtained fiber properties are only poor. As shown in the formula, it has been found that when the side chain type polyalkylene glycol is copolymerized, a copolymer having a smaller copolymerization amount, a good fiberization step property and good fiber properties can be obtained. Moreover, as shown in the equation (II), n = 15
We found that those with ~ 25H.LB5 or more were the best overall. When n in the formula (II) increases, heat resistance during spinning becomes poor and spinnability decreases, and copolymerizability when copolymerizing the formula (IV) monomer becomes insufficient. Therefore, it was not preferable, and it was concluded that it is best to set n = 25 or more.

In the present invention, the fiber cross-sectional shape may be an irregular cross-section other than the round cross-section. For example, three-lobe, T-, four-lobe, five-lobe, six-lobe, seven-leaf,
Regarding the multi-leaf shape such as an eight-leaf shape and various cross-sectional shapes, a polyester fiber having good water absorption performance can be obtained if the requirements for the polymer composition and single fiber denier described above are satisfied. Among the irregular cross-sectional shapes, a cross-sectional shape having a concave portion is more preferable because a kind of capillary phenomenon in which moisture is quickly sucked into the concave portion is exhibited and further excellent water absorption is added.

Further, a so-called conjugate fiber having a core-sheath structure or a dorsoventral structure can also be used.
As described above, more preferably, if 50% or more of the fiber surface is the copolymer, the effect of the present invention is sufficiently exhibited.

In addition, it was found that the water absorption performance of the copolyester fiber of the present invention in underwear was further improved by setting the single yarn denier to 5 denier or less.

The method of evaluating the water absorption performance will be described in detail later. However, when the water diffusion area of the underwear after washing becomes 5 denier or more per single denier, it is 5 times smaller than that of ordinary polyester fiber.
It was found that remarkable performance was not recognized in the case of denier or less when the denier was lower. Although the reason cannot be clearly determined at this time, it is thought to be due to the interaction between the hydrophilic property of the polymer itself in the fiber assembly and the capillary effect in the shape of the assembly.

In the present invention, if necessary, the above water-absorbing (copolymerized) polyester fiber may be, for example, cotton, hemp, regenerated cellulosic fiber, polyvinyl alcohol fiber, polyolefin fiber, polyamide fiber, polyester fiber, acrylic fiber, etc. Other fibers are blended or blended to produce spun yarns or filament yarns, and these are used to fabricate various fabrics, knits, and the like by an ordinary method, and use them as underwear fabrics. Also, in the case of a nonwoven fabric, for example, a staple fiber is used as the water-absorbing polyester fiber, and as long as the effect of water absorption is not impaired as necessary, for example, a heat binder fiber, a heat-shrinkable fiber and other cotton, hemp, It can be produced by mixing with fibers such as regenerated cellulose fiber, polyvinyl alcohol fiber, polyamide fiber, polyolefin fiber, polyester fiber and acrylic fiber, and by a usual dry method or wet method.

The undergarment of the present invention is composed of a fabric such as a woven fabric, a knitted fabric, or a nonwoven fabric. The water-absorbing polyester fiber is used in at least 60% by weight or more of the fibers constituting the fabric. Desired from the aspect.

It is also preferable that the undergarment of the present invention is finished by applying a treating agent such as an antibacterial agent, a deodorant, an aromatic, a cationic activator, or a softener, if necessary. Also, as described above during the production of the fiber, inorganic fine particles, for example, metal oxide,
Ceramics, for example, 3 to 30% by weight of a far-infrared radiation material such as titanium dioxide, silica, alumina, magnesia, mullite, zirconia, zircon sand, spinel, ferrite, cordierite, etc. preferable.

Underwear made using the water-absorbing polyester fiber of the present invention has high water absorption and sweat absorption properties, does not reduce the water absorption effect even with repeated washing, allows clear dyeing, and has excellent dyeing fastness. It is an underwear made of a fabric or non-woven fabric made mainly of polyester fibers. Furthermore, a product excellent in heat retention can be obtained. Conventional hydrophilic polyester fiber,
It is mainly made by applying a hydrophilic agent to the fiber surface or kneading the inside of the fiber. When such a hydrophilic agent is directly indirectly applied to the skin for a long time, such as underwear, skin damage is likely to occur. On the other hand, in the case of the underwear according to the present invention, such a problem does not substantially occur.

In addition, the water absorption of the water-absorbing polyester fiber constituting the underwear of the present invention was performed by measuring a water diffusion area. Specifically, the water diffusion area was determined by using the raw cotton obtained in each example as a web having a density of 0.02 g / cm ³ , and dropping 0.35 ml of a red ink water solution under standard conditions (20 ° C., 65% RH).
The spread area of the solution after minutes. Also, after 10 washes
The test was performed according to the JIS L0217-103 method.
Add 2 g of detergent for clothing to water at 0 ° C at a ratio of 2 g and dissolve it into a washing liquid. Put a sample and load cloth as needed into the washing liquid so that the bath ratio becomes 1:30, and wash. To start. After the treatment for 5 minutes, the operation is stopped, the sample and the load cloth are dehydrated with a dehydrator, and then the washing liquid is replaced with fresh water at room temperature, rinsed for 2 minutes at the same bath ratio as above, and then dehydrated. Rinse again for 2 minutes and air dry. The above operation was repeated 10 times to obtain a measurement sample after 10 times.

Another evaluation method was performed by measuring the water absorption rate. As for the water absorption rate, a test piece having a side of 5 cm was placed on the water surface, and the time until water spread over the entire surface, that is, the water absorption rate was measured.

The wicking length is measured according to the bilex method in accordance with JIS L1096 6.26.1 B method, and the test piece is suspended in the red ink. Measurement was performed 10 times each in the horizontal direction, and the total of the vertical and horizontal wicking lengths was defined as the wicking length.

<Examples> Next, embodiments of the present invention will be described with specific examples, but the present invention is not limited to these examples.
In the examples, parts and% relate to weight unless otherwise specified. The intrinsic viscosity is determined by measuring at 30 ° C. in a mixed solution of phenol / tetrachloroethane in an equal amount.

Examples 1-3 terephthalic acid 1000 g, was charged ethylene glycol 750g to the esterification reactor, 2 under a pressure of 2.5 Kg / cm ² at 230 ° C.
A time esterification reaction was performed. Next, the reaction product was transferred to a polycondensation apparatus that had been heated to 230 ° C. in advance, and a compound represented by the following formula (IV-1) was added to the system in an amount shown in Table 1, and a hindered phenol system was further added. A polycondensation reaction system was prepared by adding 5% by weight of the compound of formula (IV-1), 0.4 g of antimony trioxide and 0.12 g of phosphorous acid as an antioxidant. While raising the temperature of the polycondensation reaction system from 230 ° C to 280 ° C over 45 minutes, gradually reducing the pressure to 0.1 mmHg,
The condensation polymerization reaction was carried out at 80 ° C. until the melt viscosity of the system reached a predetermined value.

HLB value = 9.1 The obtained polymer of [η] 0.68 was melt-extruded and spun at a spinning temperature of 285 ° C. to obtain an undrawn fiber. 75 ° C
Stretched 3.5 times in warm water, and added a fiber oil agent mainly composed of an ethylene oxide adduct of phosphate ester, subjected to mechanical crimping, heat-set and dried, and then reached a denier of 2 denier. Water-absorbing polyester fiber was obtained. The fiber was cut into a staple fiber by cutting the fiber into a fiber length of 51 mm, then spun into a spun yarn, and woven in a conventional manner to produce a plain woven fabric.

As a result, as shown in Table 1, the fabrics of the examples had extremely good water absorption performance.

Further, when the fabric obtained in the example was sewn into a shirt and used, it was found that even a person having a high perspiration had good sweat-absorbing property, had no wet feeling, and had a good touch. In addition, skin injuries did not occur even when worn for a long time.

Examples 4 and 5 Example 4 was carried out in the same manner as in Example 1 except that the denier of single yarn was 1.3 dr, and that of Example 5 was 3.0 dr of single denier. The obtained fabric had good water absorption performance and was comfortable as underwear.

Example 6 A polyester was obtained in the same manner as in Example 1, except that the compound represented by the formula (IV-2) was added in the amount shown in Table 1 instead of the compound represented by the formula (IV-1). .

HLB value = 9.6 The obtained polymer was tested in the same manner as in Example 1 except for the above. Underwear having good water absorption and good comfort was obtained.

Example 7 A polyester was obtained in the same manner as in Example 1, except that the compound represented by the formula (IV-3) was added in an amount shown in Table 1 instead of the compound represented by the formula (IV-1). .

HLB value = 9.3 The obtained polymer was tested in the same manner as in Example 1. A fabric having good water absorption and good comfort was obtained.

When the woven fabric was sewn on an undergarment and used, it had a cotton-like texture and a tactile sensation, had good sweat-absorbing properties, had no moisture like cotton, and had high heat retention. In addition, even if the water washing was repeatedly performed, the water absorption performance hardly decreased.

Example 8 A polyester was obtained in the same manner as in Example 1, except that the compound represented by the formula (IV-4) was added in an amount shown in Table 1 instead of the compound represented by the formula (IV-1). .

HLB value = 6.2 The obtained polymer was tested in the same manner as in Example 1. The fiber was spun at a spinning temperature of 285 ° C. to obtain a fiber having a round cross section. The fiber is stretched in hot water at 75 ° C., a fiber oil agent containing a phosphate ester ethylene oxide adduct as a main component is applied, mechanically crimped, heat-set and dried to obtain a single-filament fineness of 2 denier. A polyester fiber was obtained. This fiber is cut to a fiber length of 51 mm to form a staple fiber, and then the staple of this water-absorbing polyester fiber and a thermal binder fiber (polyethylene terephthalate) as a core component and denatured polyester as a sheath component (denier 2 denier, fiber length 51 mm) The fiber is mixed with the fiber at a ratio of 75:25, the fiber web is passed through a card and a random weber, entangled by a needle punch method, further treated with hot air at 135 ° C., and the fibers are fixed with binder fibers. An average weight per unit of 125g /
A fiber entangled nonwoven fabric having m ² and an apparent density of 0.23 g / cm ³ was obtained.

The water absorption performance of this nonwoven fabric had good water absorption performance.

When this non-woven fabric was used after being processed into a shirt, it had good heat retention and sweat absorption.

Examples 9 and 10 Example 9 was carried out in the same manner as in Example 1 except that spinning was carried out using a U-shaped nozzle and Example 10 was carried out using a T-type nozzle. In each case, a nonwoven fabric and underwear having good fiberizing processability, good water absorption and good wiping properties were obtained.

Example 11 A sheath obtained by adding 6% of mullite (Al ₂ O ₃ · SiO ₂ type ceramic fine powder) to a copolymerized polyester having the same composition as in Example 1 was used as a sheath, and polyethylene terephthalate of [η] 0.67 was used as a core. Core / sheath composite spinning with a round cross section was performed at a core / sheath = 50/50 weight ratio. Extrusion at a spinning head temperature of 290 ° C 100
It was wound off at 0m / min. Wind the spun yarn at 75 ° C in a water bath.
It was stretched by a factor of 4.2 and then shrunk by 8% at 95 ° C. in a water bath to obtain a fiber having a single fiber denier of 2.0. After making this fiber a staple fiber and a spun yarn, the knitted fabric obtained by knitting is dyed,
When sewn on underwear, it has high heat retention, high sweat absorption, no moist feeling, good feeling of use, and there is no decrease in water absorption performance even after repeated washing, The change was as good as the ordinary polyester fiber.

In addition, the water absorption performance of this fabric had good water absorption performance.

Comparative example 1 It carried out similarly to Example 1 except having used normal polyethylene terephthalate. The water absorption was very poor.

Comparative Example 2 A polyester was obtained in the same manner as in Example 1, except that the compound represented by the formula (IV-5) was added in an amount shown in Table 1 instead of the compound represented by the formula (IV-1). .

HLB value = 24.2 The obtained polymer was tested in the same manner as in Example 1, but the heat resistance during spinning was somewhat poor and the spinnability was poor. In addition, immerse the obtained fiber in water, and
As a result of measurement with a C meter, it was found that a substance presumed to be a monomer of the formula (IV-5) was considerably eluted from the fiber, and that the copolymerizability was insufficient. Since the amount of eluted substances from the fiber was large, it was not suitable for use as a commercial product, and the evaluation as underwear was not possible.

Comparative Example 3 A polyester was obtained in the same manner as in Example 1, except that the compound represented by the formula (IV-6) was added in an amount shown in Table 1 instead of the compound represented by the formula (IV-1). .

HLB value = 1.3 The obtained polymer was tested in the same manner as in Example 1, but the water absorption was at a poor level.

Comparative Example 4 A polyester in which the compound unit used in Example 1 was copolymerized at 60% by weight was obtained in the same manner as in Example 1. When this polymer fiberization was performed, single yarn breakage during spinning,
Thread breaks occurred frequently. Furthermore, since the stretchability was poor, the evaluation as a nonwoven fabric was not completed.

<Effects of the Invention> The underwear of the present invention made using a specific water-absorbing polyester fiber has high water absorption and sweat absorption properties, does not reduce the water absorption effect even upon repeated washing, and allows clear dyeing. It is an underwear made of a fabric or non-woven fabric mainly composed of polyester fiber having excellent color fastness. Furthermore, a product excellent in heat retention can be obtained.

Continuing on the front page Jury President Yukie Sato Judge Sugihara Susumu Judge Judge Funakoshi Takuko (56) References JP-A-1-236236 (JP, A)

Claims (1)

(57) [Claims] 1. A dicarboxylic acid unit, a diol unit and a compound represented by the general formula Wherein, x and y each represents 0 or 1, Z is wherein _{-O- (R 2 -O) n-} R 1 (II) ( wherein, R ₁ represents a hydrocarbon group having 3 to 18 carbon atoms And R ₂ represents an alkylene group, and n is a number of 15 to 25 representing an average degree of polymerization. Determined by the Davis method for the compound represented by
A monovalent group having an HLB value of 5.0 or more], wherein the content of the structural unit represented by the general formula (I) is 1 to 50% by weight, and phenol and tetra An undergarment comprising fibers made of a copolymerized polyester having an intrinsic viscosity of 0.5 to 1.5 dl / g at 30 ° C. in a mixed solvent of chloroethane in the same weight as a main constituent fiber.