JP3182267B2 - Elastic composite fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to stretchable conjugate fibers. More specifically, the present invention relates to a natural fiber, particularly a conjugate fiber having elastic elasticity and recovery properties of wool.

[0002]

2. Description of the Related Art Conventionally, various methods have been used for imparting excellent characteristics of a fabric made of natural fibers to synthetic fibers such as tension, waist, swelling, sliminess, suppleness, and softness. Proposed. For example, in order to impart a silky feel to synthetic fibers, it has been proposed to deform the fiber cross section, mix fibers of different shrinkage fibers, entangle the fibers with a fluid, mix fibers of different fineness, and ultrafine fibers. ing. Further, in order to impart a feeling of wool to the synthetic fibers, mechanical crimping is applied to the fibers by post-processing such as false twisting, fluid processing, and gear crimping, and anisotropic cooling or differentiating during yarn production. There has been proposed a method in which a polymer having different thermal properties is combined into a side-by-side type or a core-in-sheath type and a crimp is imparted by utilizing the difference in the thermal properties of the polymers. In addition, brushing and the like have been proposed.

[0003] However, although the above-mentioned method can give the synthetic fibers a feeling similar to that of natural fibers to some extent, they are still unsatisfactory. In particular, the natural fibers have a yarn weight in a fabric. The fact is that synthetic fibers are significantly inferior in terms of buzzing. For this reason, the length and width of the fabric made of such synthetic fibers is small, and the tailoring appearance when tailored as clothes is inferior.

[0004] Further, in order to generate voids in the synthetic fibrous fabric and to impart elasticity to the fabric, a fiber having a fiber cross-sectional structure as shown in FIG.
A structure in which a relatively high shrinkage polymer is disposed in the portion C has been proposed (JP-A-59-59920,
-287810). However, in the woven fabric, an absolute distance at which the yarn can move freely to some extent is necessary.In the former, since the twist occurs only in one direction, in the woven fabric in which the yarn such as satin is not so strongly restrained, voids are formed in the woven fabric due to the appearance of the twist. This gives the fabric a certain degree of elasticity, but is unsuitable when the yarn is strongly constrained, such as a plain weave. In the latter, a twist that intermittently reverses around the core with a high shrinkage polymer is developed, but since the fiber cross section is flat, this twist alone cannot maintain a sufficient space in the fabric, and The elasticity and volume feeling are insufficient.

Further, in order to impart elasticity to synthetic fibers, it has been proposed to use a thermoplastic elastomer as a polymer (Japanese Patent Publication No. 2-36683).
Suitable for fields requiring extremely high elasticity, such as sportswear, where specially high elasticity is required, but far from the natural elasticity of natural fibers. And is unsuitable for ordinary clothing. Further, the fiber made of such a thermoplastic elastomer has a small heat shrinkage stress of 0.1 to 0.2 g / denier, and although it has elasticity when used in a woven fabric, it does not easily develop swelling and has a poor feeling. Inferior in point.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fabric which has almost the same natural and good stretchability and elastic recovery properties as natural wool and has a tailored look. To provide fibers.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a longitudinally extending central portion made of a thermoplastic polymer (A), and the central portion is adhered to the central portion to surround the central portion. A fiber having a multi-lobed cross section comprising a protrusion extending in a longitudinal direction, wherein at least a part of the protrusion is a thermoplastic polymer.
Thermoplastic polymer (B) having a smaller heat shrinkage than (A)
A conjugate fiber characterized by being composed of:
The thermoplastic polymer (A) is a polyester obtained by copolymerizing 1 to 20 mol% of a compound represented by the following formula (I) and / or the following formula (II) with respect to all dicarboxylic acid components. This is achieved by providing a composite conjugate fiber.

Embedded image (In the formula, m represents 0, 1 or 2.)

Embedded image (Wherein, R represents a hydrogen atom or a lower alkyl group;
Represents 0, 1 or 2. )

FIG. 1 shows an example of a cross section of a conjugate fiber according to the present invention.
, But is not limited to this. The conjugate fiber of the present invention is, for example, as shown in FIGS.
A multi-layer comprising a central portion 1 made of a thermoplastic polymer (A) extending in the fiber axis direction and three or more projecting portions 2 extending in the fiber axis direction and provided around the central portion 1 and connected to the central portion. It is a composite fiber having a leaf cross-sectional shape.

In FIG. 1, the number of the protruding portions 2 is three to five. However, the number of the protruding portions 2 may be three or more, and is not limited to the one shown in FIG. The number of the protruding portions is 3 to 3 in terms of ease of production of the conjugate fiber and the feeling of the fabric obtained from the conjugate fiber.
Preferably, the number is about eight. The angle between adjacent protrusions may be equal or different, and the lengths of the protrusions may all be the same or different, and are not particularly limited. The shape of the protrusion is not particularly limited, for example, even if the tip is thinner than the root,
The tip may be thicker than the root, the tip may be flat, or the tip may be round. Furthermore, the shape of the fiber cross section may be geometrically or mechanically symmetric or asymmetric.

[0010] In the composite fiber of the present invention, it is necessary that the center portion is made of the thermoplastic polymer (A) and at least a part of the protruding portion is made of the thermoplastic polymer (B). "At least a part of the protruding portion is made of the thermoplastic polymer (B)" refers to FIG.
(G) when the entire protrusion 2 is made of the thermoplastic polymer (B) as shown in FIG.
As shown in (d), the case where only a part of the protruding portion 2 is made of the thermoplastic polymer (B) is included.

[0011] Only a part of the protrusion 2 is made of a thermoplastic polymer.
In the case of (B), other portions of the protruding portion 2, for example, in the case of FIGS. 1A to 1D, the connecting portion 3 between the center portion 1 and the tip portion is a thermoplastic polymer (A). By heart 1
It is preferable to form them integrally. Only the intermediate portion of the protrusion 2 is formed from the thermoplastic polymer (B), or the thermoplastic polymer (A) and the thermoplastic polymer are formed in the protrusion 2.
(B) may be combined with each other, but the thermoplastic polymer may be used at the tip portion of the protruding portion 2, at any position between the tip portion and the root portion, or at the root portion.
It is preferable that the protrusion 2 is formed from the thermoplastic polymer (B) to form a composite so that the boundary between (A) and the thermoplastic polymer (B) is clearly formed. It is preferable to form a composite such that at least the tip portion is made of the thermoplastic polymer (B), since the twisting of the fiber is improved.

The thermoplastic polymer (A) constituting the conjugate fiber of the present invention is a polyester whose main repeating unit is ethylene terephthalate, and the above-mentioned formula (I) is within a range not to impair the object of the present invention. And / or a third component other than the copolymer component represented by the formula (II) may be copolymerized.

The copolymerizable third component includes isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid,
4'-diphenylsulfone dicarboxylic acid, 4,4'-diphenylisopropylidene dicarboxylic acid, 1,2-diphenoxyethane-4 ', 4 "-dicarboxylic acid, anthracene dicarboxylic acid, 2,5-pyridine dicarboxylic acid, diphenyl ketone Aromatic dicarboxylic acids such as dicarboxylic acid and sodium sulfoisophthalate; malonic acid, succinic acid,
Aliphatic dicarboxylic acids such as adipic acid, azelaic acid and sebacic acid; alicyclic dicarboxylic acids such as decalin dicarboxylic acid and cyclohexanedicarboxylic acid; β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, hydroxypropionic acid and hydroxyacrylic acid Or a carboxylic acid derived from an ester-forming derivative thereof; an aliphatic lactone such as ε-caprolactone; trimethylene glycol; tetramethylene glycol;
, Hexamethylene glycol, neopentyl glyco-
Aliphatic diols such as toluene, diethylene glycol, and polyethylene glycol; hydroquinone, catechol, naphthalenediol, resorcinol, bisphenol A, ethylene oxide adduct of bisphenol A, bisphenol-
And aromatic diols such as ethylene oxide adduct of bisphenol S and alicyclic diols such as cyclohexane dimethanol. These third
One or more of the components may be copolymerized.

Further, the thermoplastic polymer according to the present invention
(A) includes polycarboxylic acids such as trimellitic acid, trimesic acid, pyromellitic acid, and tricarballylic acid within a range where the polymer is substantially linear; glycerin, trimethylolethane, and trimethylolpropane. And a multivalent alcohol such as pentaerythritol.

The thermoplastic polymer (A) according to the present invention requires that a compound represented by the following formula (I) and / or a compound represented by the following formula (II) be copolymerized. is there.

[0016]

Embedded image (In the formula, m represents 0, 1 or 2.)

[0017]

Embedded image (Wherein, R represents a hydrogen atom or a lower alkyl group;
Represents 0, 1 or 2. )

The compound of the formula (I) or the compound of the formula (II)
Is copolymerized, the copolymerization amount is in the range of 1 to 20 mol%, preferably 2 to 15 mol%, based on the dicarboxylic acid component constituting the polyester. When the compounds of the formula (I) and the formula (II) are used as the copolymerization component, the copolymerization amount thereof is 1 to 20 mol% and 2 to 15 mol% of the dicarboxylic acid component in the sum thereof. It is preferably within the range.

When the copolymerization amount of the compound represented by the formula (I) and / or the compound represented by the formula (II) is less than 1 mol%, the heat shrinkage of the polyester does not increase, and such a polyester is used in the present invention. When used as the polymer (A) of the invention, good stretchability cannot be obtained. On the other hand, if the copolymerization amount of the compound exceeds 20 mol%, the polymerizability of the polyester decreases, and spinning becomes difficult, and it becomes difficult to obtain a crystalline polyester fiber. Even if it is obtained, its melting point is low, so that the heat resistance and mechanical properties required for the polyester fiber are greatly reduced, and the fastness of the dyed product is reduced.

The thermoplastic polymer (A) according to the present invention
Can be polymerized by a usual method. For example, terephthalic acid and ethylene glycol are directly esterified, a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or terephthalic acid is reacted with ethylene oxide. Thus, the first-stage reaction to form the ethylene glycol ester of terephthalic acid and / or its low polymer, and the reaction product obtained in the first stage is heated under reduced pressure to a desired degree of polymerization. It is produced by a second stage reaction of polycondensation reaction. At this time, the compound represented by the formula (I) and / or the formula (II) may be used in any desired amount until the polycondensation reaction is completed, for example, starting materials for the polyester, transesterification reaction and then polycondensation reaction. Can be added before. Further, in order to increase the degree of polymerization, it is also possible to carry out solid phase polymerization after performing polymerization in a liquid phase.

The thermoplastic polymer (A) according to the present invention has an intrinsic viscosity [phenol / tetrachloroethane (weight ratio of 5).
0/50) at 30 ° C. using a mixed solvent of 0.4)
It is preferably in the range of 1.5 to 1.5.

The above thermoplastic polymer (A) has a heat shrinkage stress of 0.25 g / denier or more, preferably 0.45 g / denier or more.
g / denier or more and a heat shrinkage of 15% or more, preferably 20% or more are desirably used. Heat shrinkage stress of thermoplastic polymer (A) is 0.25g
If it is less than / denier, the resulting woven fabric is inferior in swelling and has a problem in hand. If the heat shrinkage is less than 15%, the obtained woven fabric becomes hard, and a comfortable fabric cannot be obtained.

The other component, a thermoplastic polymer
As (B), polyamide and polyester are preferably used. Nylon 6, Nylon 6 as polyamide
6, nylon 610, nylon 11, nylon 12, nylon 13, and the like can be used. As the polyester, polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate and the like and those obtained by copolymerizing 5-sodium sulfoisophthalic acid with these can be used. As long as the thermoplastic polymer (B) has a smaller heat shrinkage than the thermoplastic polymer (A), the heat shrinkage stress may be the same as or larger than that of the thermoplastic polymer (A).

[0024] The combination of these two components is spinning, drawing,
It is necessary to select a combination suitable for compatibility, laminating adhesiveness, and the like so that both components do not peel off in the processing and fabricating steps. In particular, in order to impart appropriate elasticity and elastic recovery, it is preferable that the difference between the thermal shrinkage rates of the two components is in the range of 5 to 20%, particularly 10 to 20%. If the difference between the heat shrinkage rates of the two components is less than 5%, twisting is difficult to develop and a woven fabric with insufficient elasticity may be obtained, which is not preferable. On the other hand, when the difference between the thermal shrinkage rates of the two components exceeds 20%, the twist is developed, but the thermal shrinkage rate of the conjugate fiber itself also increases, and the processing shrinkage rate at the stage of processing into a woven fabric increases. The hand of the woven fabric tends to be hard, which is not preferable.

The thermoplastic polymer (A) and the thermoplastic polymer (B) have a weight ratio of 20 / 80-80.
/ 20, particularly 30/70 to 70/30, is preferable in that the twist of the composite fiber of the present invention is easily developed. Thermoplastic polymer (A) and thermoplastic polymer (B)
When the amount of either is extremely small, twisting of the conjugate fiber becomes difficult to develop, but it is also possible to obtain the target shrinkage performance and twisting by devising spinning and drawing conditions.

The thickness of the central portion and the protruding portion in the composite fiber of the present invention is not particularly limited. However, when a fabric such as a woven or knitted fabric is used, a flexible and good-feel fabric can be obtained. It is preferred that the protrusions have approximately the same fineness or that the central portion has a higher fineness than the protrusions. The conjugate fiber itself is usually preferably about 50 denier / 48 filaments to about 150 denier / 48 filaments.

The conjugate fiber of the present invention can exhibit a twisted structure in which the twist is intermittently reversed due to heat history during the fiber manufacturing process or heat treatment during fabric processing. Naturally, when the composite fiber is in a contracted state, the thermoplastic polymer (A) having a large heat shrinkage as a core has a structure in which the thermoplastic polymer (B) is twisted and the twist is intermittently reversed. . The intermittent reversal is performed because intermittent reversal occurs to absorb rotational distortion caused by the yarn (fiber) being twisted, thereby reducing the torque of the entire yarn. Therefore, the yarn has a characteristic that it does not generate a strong torque even by expansion and contraction.

The composite fiber of the present invention having the above-mentioned twist structure has a heat shrinkage of 10 to 35%, particularly 15 to 30%. When a fiber having such expansion and contraction ratio is used as a fabric, the expansion and contraction ratio of the fabric becomes 5 to 25%, which is similar to the expansion and contraction ratio of a natural fiber, particularly a wool fabric.

When fabricating clothes, it is generally considered that the tailoring of the clothing material is an important factor in the horizontal stretching of the cloth, and the clothing fabric made of the fabric having a small horizontal stretching is extremely poor in tailoring appearance. Since the conjugate fiber of the present invention has an appropriate stretchability and elastic recovery property, a fabric made of such a fiber or a garment using such a fiber as a weft has an appropriate stretchability, that is, an appropriate weft elongation. And the tailoring looks good.

Further, among the composite fibers having the above-mentioned expansion and contraction rate, the composite fibers having an irregularity described later in the range of 0.05 to 0.80 have a porosity of 15 to 60 when formed into an aggregate.
%, And a fiber aggregate having a very light feeling can be obtained.

The conjugate fiber of the present invention can be prepared by using a spinneret having a desired discharge hole, using a thermoplastic polymer (A) and a thermoplastic polymer (B) having a smaller shrinkage ratio than the thermoplastic polymer (A). ) At a normal spinning speed of, for example, 1000 to 4000 m / min, and after cooling, winding up while adding oil if necessary, stretching and heat treatment at an appropriate temperature and a desired stretching ratio. Is obtained by The spinning may be a high-speed spinning method or a direct spinning and drawing method. As described above, the conjugate fiber of the present invention can be produced by a normal conjugate spinning method, and the thermoplastic polymer (A) and the thermoplastic polymer are used.
If the difference in melt viscosity from (B) is extremely large, kneading tends to occur in the spinneret and the spinning processability deteriorates.
The combination of the thermoplastic polymer (A) and the thermoplastic polymer (B) requires consideration not only in the heat shrinkage but also in that respect. In addition, the heat treatment may be performed as a process separated from the stretching process and may be performed independently, or the stretching and the heat treatment may be performed as one process. preferable. Further, the heat treatment may be performed in a fiber (yarn) state, or may be performed in a process corresponding to the heat treatment in the fabric manufacturing process, for example, a heat treatment in a scouring process, a preset process, a dyeing process, or the like.

The stretching temperature, stretching ratio, and heat setting temperature used in the stretching process of the conjugate fiber are factors that often directly affect the shrinkage, stretchability, and the like of the conjugate fiber and the fabric obtained therefrom. In performing the stretching treatment, it is necessary to pay sufficient attention to the stretching temperature, the stretching ratio, and the heat setting temperature. In particular, the thermoplastic polymer (A) and the thermoplastic polymer constituting the composite fiber
In (B), stretching at a temperature equal to or higher than the glass transition temperature of a polymer having a high glass transition temperature can be carried out in a process step.
It is preferable from the viewpoint of tailoring of the product.

The heat treatment performed after the stretching may be performed continuously with the stretching process, or may be performed separately from the stretching process. And, even if the heat treatment is carried out in the state of fibers or yarns, it can be carried out at the time of fabric production step or after fabric production (for example, scouring step, pre-set step,
(Dyeing step, etc.). The heat treatment temperature can be appropriately selected according to the crystallization temperature of the thermoplastic polymer (A) constituting the conjugate fiber, the type of the thermoplastic polymer (B), the crystallization temperature, and the like.

Furthermore, the conjugate fiber obtained as described above may be entangled with a fluid or the like, if necessary, alone or in combination with other fibers; false twisting, fluid processing, gear crimping And crimping treatment; etc .; The conjugate fiber of the present invention can be used alone, or blended with other synthetic fibers or natural fibers, and blended into a fabric.Especially, in a woven fabric, at least the weft also uses a yarn made of the conjugate fiber of the present invention. It is possible to obtain a good-looking fabric which is rich in elasticity and swelling and gives a tailored look.

The conjugate fiber of the present invention may contain, if necessary, additives usually used for the fiber, for example, an ultraviolet absorber, a fluorescent brightener, a pigment, and inorganic fine particles.

[0036]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In addition, each measured value in an Example is a value obtained by measuring by the following method.

(1) Intrinsic viscosity of polymer [η] (dl /
g) A value measured at 30 ° C. after dissolving in a mixed solvent of phenol / tetrachloroethane (weight ratio: 1: 1).

(2) Secondary transition temperature Tg of polyester
(° C) and crystallinity Differential Scanning Calorimeter (Metra-TA3
000, manufactured by Perkin Elmer Co., Ltd.)
g, the temperature was increased and decreased at a rate of 10 ° C./min while measuring with nitrogen replacement. This operation was repeated twice with the same sample, and the second value was set as the actually measured value. The heat of crystal fusion (J / g) after the sample was heat-treated and sufficiently crystallized was measured by the above-mentioned apparatus, and the result was shown as the crystallinity.

(3) Thermal Shrinkage Stress (g / Denyl) of Thermoplastic Polymer (A) Using the polymer alone, spinning was performed under the same production conditions as for the composite fiber, and then the heating roller temperature was increased. 10 cm of drawn yarn obtained by drawing at 75 ° C., hot prep at 120 ° C., and a draw ratio of 70 to 75% of the cut draw ratio is sampled, and both ends are tied into a loop. This is referred to as an autograph (AG-2000).
(Type A, manufactured by Shimadzu Corporation) under a load of 0.5 g / denier while heating at a rate of 1 ° C./min from room temperature. At this time, the maximum shrinkage stress (g) was read and divided by the total fineness (denier) of the yarn to determine the shrinkage stress per single fineness (g / denier).

(4) Thermal Shrinkage (%) of Thermoplastic Polymers (A) and (B) Using each polymer alone, it is spun under the same production conditions as the conjugate fiber, and then heated with a roller. A temperature of 75 ° C., a hot plate of 120 ° C., and a drawn yarn obtained by drawing at a draw ratio of 70 to 75% of the cut draw ratio, a load of 100 mg / denier is applied to the drawn yarn to reduce its length to L ↓. After that, the drawn yarn was immersed in boiling water under a load of 1 mg / denier for 20 minutes, and then 100% was added to the dried yarn.
Fiber length L ↓ 1 measured by applying a load of mg / denier
From the following equation. Heat shrinkage (%) = ｛(L ↓ 0-L ↓ 1) / L ↓ 0｝ × 1
00

(5) Heat Shrinkage Ratio (%) of Composite Fiber The drawn yarn of the composite fiber is wound into a helical shape, and 1 mg / denier
After immersion in boiling water for 20 minutes, 24
Dry under tension at 20 ° C., 65% RH for hours. Next, a load of 1 mg / denier and 200 mg / denier were applied, and after measuring the length (L ↓ 2) after 2 minutes, the 200 mg / denier load was immediately removed, and 2 minutes passed. The subsequent length (L ↓ 3) was measured and calculated by the following equation. Expansion / contraction rate (%) = {(L2-L3) / L3} x 10
0

(6) Deformity of fiber The value is calculated by the following formula by taking an optical microscope photograph of the fiber cross section. Degree of irregularity = R / L The length of the line connecting the adjacent tips A and B in the fiber cross section is L, and from the depression D located in the middle of the adjacent tips to the line connecting the adjacent tips A and B The length CD of the perpendicular was calculated as R.

(7) Porosity (%) of fiber assembly Three yarns are aligned, and a lower twist of 2500 T / M is applied, and three yarns are combined to form a twisted yarn of S400 T / M. An optical micrograph of a cross section of the fiber cut with a microtome was taken. The photograph was enlarged, cut into fibers and voids, and the porosity was determined from the weight ratio. Porosity (%) = (weight of void) × 100 / (weight of fiber + weight of void)

(8) Stretchability of fabric In a tensile measurement of a hand feeling measuring device (KES system, Kat-Tech Co., Ltd.), a sample having a width of 20 cm
The elongation at the time of pulling with a force of g / cm was Emax, and the value was expressed in%.

(9) Dyeing rate (%) The dyeing solution was diluted to a predetermined concentration with a mixed solution of acetone / water (volume ratio: 1: 1), and the absorbance of the solution was measured with a spectrophotometer. Using the absorbance at the position of the maximum absorption wavelength, the dyeing rate was determined according to the following equation. Dyeing ratio (%) = (BA) × 100 / BA A: Absorbance of diluted stain after staining B: Absorbance of diluted stain before staining

(10) Deep Chromaticity (K / S) Using the dyed sample, the spectral reflectance (R) was measured with a color analyzer (Hitachi 307, manufactured by Hitachi, Ltd.).
The following equation was obtained from the Kubelka-Munk equation. The greater this value, the greater the deep chromaticity. K / S = (1−R) ↑ 2 / 2R R: reflectance at maximum absorption wavelength position of visible portion reflectance curve of sample cloth

(11) Lightweight of Cloth A final product having the same structure and the same area was compared with a cloth made of polyethylene terephthalate fiber as a reference. ◎: Very light and swelled. : Light and swelled. Δ: Lightness is not felt much. ×: Heavy and no features.

Examples 1 to 3 Perhydrodimethanonaphthalenediethanol (compound of the formula (I) wherein m = 1) as the thermoplastic polymer (A) is shown in Table 1. Using polyethylene terephthalate copolymerized in (1) and using polyethylene terephthalate having [η] of 0.68 and a heat shrinkage of 7% as a thermoplastic polymer (B), FIG. A composite fiber having a cross-sectional shape was spun out and wound at a take-up speed of 1000 m / min. Table 1 shows the heat shrinkage and the heat shrinkage stress of the thermoplastic polymer (A).

The spun yarn obtained from the composite fiber was heated to a temperature of 75 ° C.
Using a heating roller at a temperature of 120 ° C.
Stretching is performed at a stretch ratio of 70% of the cut stretch ratio, and
A denier / 36 filament drawn yarn was obtained. The drawn yarn is subjected to a false twist number of 350 using a spindle false twisting machine.
0 times / m, twisting at a false twisting temperature of 200 ° C.
/ 2 twill fabric. The woven fabric was desizing, scouring, and drying. After the bulk was dried at 170 ° C., the weight was reduced by 20% by weight, and the fabric was dyed and finished under the following dyeing conditions.

Dyeing conditions Dye: Sumikaron Red S-BL1 (Sumitomo Chemical Co., Ltd.) 3% owf Dispersion leveling agent: Disper-TL (Meisei Chemical Co., Ltd.) 1 g / liter pH adjuster: acetic acid 0.5 cc / liter Bath ratio 1:50 Staining temperature 130 ° C Staining time 40 minutes Reduction washing Hydrosulfide 1 g / L Sodium hydroxide 1 g / L Amilazine D (Daiichi Kogyo Seiyaku Co., Ltd.) 1 g / L

The final product was evaluated and the results are shown in Table 2. Each of the woven fabrics had moderate elasticity, and had the same swelling, tension, waist, and resilience as the wool woven fabric. Further, it was light and had good dyeability, and was excellent in deep color.

Comparative Examples 1-2 The thermoplastic polymer (A) was polymerized in the same manner as in Example 1 except that the copolymerization amount of perhydrodimethanonaphthalenediethanol was changed as shown in Table 1. [Η] of the thermoplastic polymer (B) is 0.68 and the heat shrinkage is 7%
Using polyethylene terephthalate, spinning, stretching and false twisting were performed under the same conditions as in Example 1 to fabricate a woven fabric. Subsequently, desizing, scouring, drying, weight loss, dyeing, and finishing were performed, and the final product was evaluated. Table 2 shows the results. A woven fabric of a composite fiber made of a combination of polyethylene terephthalates having a small difference in heat shrinkage without using perhydrodimethanonaphthalenediethanol as a copolymer component has a small stretchability, and is a wool fabric. It was far from the product. Also, the conjugate fiber of Comparative Example 2 in which the copolymerization amount of perhydrodimethanonaphthalenediethanol was large was poor in spinnability, and a satisfactory fiber could not be spun.

Example 4 A conjugate fiber was spun in the same manner as in Example 1, and the raw fiber of the conjugate fiber was spun using a heating roller at a temperature of 75 ° C., a hot plate at a temperature of 120 ° C., and a cutting draw ratio of 75. The stretching was performed at a stretching ratio of%. Subsequently, the drawn yarn was subjected to false twisting, a woven fabric was woven, desizing, scouring, drying, weight reduction, dyeing, and finishing were performed, and the final product was evaluated. The stretch ratio of the woven fabric was 17%, and the woven fabric had a tailored look. In addition, it was excellent in dyeability and deep color, and had high commercial value.

Example 5 In Example 1, perhydrodimethanonaphthalenedicarboxylic acid [in the compound represented by the formula (II), n = 1
Was polymerized in the same manner except that 8 mol% of the compound was copolymerized, and composite spinning was carried out. The obtained spun yarn was drawn under the same conditions as in Example 1 and subjected to false twisting to weave a woven fabric. Then, desizing, scouring, drying, weight loss,
Dyeing and finishing were performed, and the final product was evaluated. Table 2 shows the results. The quality of the fabric was as good as the fabric obtained in Example 1.

Comparative Examples 3 and 4 Composite spinning was performed in the same manner as in Example 1 except that the cross-sectional shape of the conjugate fiber was changed to a side-by-side type (Comparative Example 4) having a round cross section as shown in FIG. Done. The obtained spun yarn was drawn under the same conditions as in Example 1 and subjected to false twisting to weave a woven fabric. Subsequently, desizing, scouring, drying, weight loss, dyeing, and finishing were performed, and the final product was evaluated. The woven fabric obtained in Comparative Example 3 had a small stretch ratio and did not look tailored. The woven fabric obtained in Comparative Example 4 was:
Since the crimps of the fibers constituting the spiral are spiral and the multifilaments are crimped in a group, they lack the lightness and lack tailoring.

Example 6 In Example 1, perhydrodimethanoanthracene dimethanol (m = 2 in the compound represented by the formula (I)) was used in place of perhydrodimethanonaphthalenedimethanol.
Was polymerized in the same manner except that 8 mol% of the compound was copolymerized, and composite spinning was carried out. The obtained spun yarn is drawn at a draw ratio of 80% of the cut draw ratio using a heating roller at a temperature of 85 ° C. and a hot plate at a temperature of 150 ° C., and the obtained drawn yarn is used as a warp and a weft. 79 wefts / inch and 72 wefts / inch taffeta were woven. Subsequently, desizing, scouring, drying, weight loss, dyeing, and finishing were performed, and the final product was evaluated. Table 2 shows the results. The woven fabric was swollen, excellent in flexibility and lightness.

Example 7 A polyester was polymerized in the same manner as in Example 1 except that perhydrodimethanonaphthalenediethanol was copolymerized by 18 mol%, and composite spinning was carried out. The obtained spun yarn was stretched under the same conditions as in Example 1, subjected to false twisting, and woven into taffeta. Subsequently, desizing, scouring, drying, weight loss, dyeing, and finishing were performed, and the final product was evaluated. Table 2 shows the results. The woven fabric was swollen, excellent in flexibility and lightness.

[0058]

[Table 1]

[0059]

[Table 2]

[0060]

The woven or knitted fabric comprising the conjugate fiber of the present invention has the same elastic recovery as that of the woven or knitted fabric comprising natural fibers and wool.
It has elasticity and resilience, and is also tailored.

[Brief description of the drawings]

FIG. 1 is a view showing a cross section of a conjugate fiber of the present invention, and FIGS. 1 (a) to 1 (h) are one embodiment thereof.

FIG. 2 is a view showing a cross section of a conventional stretchable conjugate fiber.

[Explanation of symbols]

 A: Thermoplastic polymer (A) B: Thermoplastic polymer (B) C: High shrinkage polymer D: Low shrinkage polymer 1: Center 2: Projection 3: Connection

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D01F 8/14 D01F 6/84 C08L 67/00-67/08 C08G 63/00-67/91

Claims (1)

(57) [Claims] 1. A multi-lobal cross section comprising a central portion of a thermoplastic polymer (A) extending in a fiber axial direction, and a protruding portion adhered to the central portion and surrounding the central portion and extending in the fiber axial direction. Wherein at least a part of the protruding portion is made of a thermoplastic polymer (B) having a smaller heat shrinkage than that of the thermoplastic polymer (A). The thermoplastic polymer (A) has the following formula (I) and / or the following formula (I)
A stretchable conjugate fiber, which is a polyester obtained by copolymerizing the compound represented by (I) with 1 to 20 mol%. Embedded image (In the formula, m represents 0, 1, or 2.) (Wherein, R represents a hydrogen atom or a lower alkyl group;
Represents 0, 1 or 2. )