JP2001164429A - Crimped conjugate filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a crimped conjugate filament having good crimpable characteristics, capable of providing a fabric having a soft feeling and excellent in repulsion, and also capable of providing the fabric hardly having a glint feeling and excellent in light feeling. SOLUTION: This crimped filament is a side-by-side type conjugate filament comprising (A) a fine particle-containing polyester satisfying the formula (1): 0.015<=ϕ.W<=3.2 (1) [ϕ is a particle diameter of the fine particle (μm) ; and W is the content of the fine particles (wt.%)], and (B) a fiber-forming polymer having >=150 deg.C melting point, and having a hollow holes satisfying the formulas (2) and (3): 1<=α1<8 (2) (α1 is the number of holes); and 1.5<=α2<=22.0 (3) (α2 is the percentage of hollowness).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-by-side conjugate long fiber which has a soft feel, has no glare, is lightweight, and has excellent crimp elongation. Also,
The present invention relates to a conjugate long fiber which can be made into a high-quality fabric having bulk, bulge, tension, waist, and elasticity when formed into a woven or knitted fabric.

[0002]

2. Description of the Related Art Conventionally, polyurethane elastic fiber yarns having excellent elasticity have been used to impart excellent elasticity to woven fabrics. However, this polyurethane elastic fiber yarn is unique to polyurethane. However, there is a drawback that the texture is hard and the texture and drape property of the fabric are reduced. In order to eliminate this drawback, weaving a woven fabric using a combination of a polyurethane elastic fiber yarn and a polyester yarn has also been performed, but both yarns have a difference in dyeability and dye the woven fabric. In this case, there is a disadvantage that the dyeing process becomes complicated or it becomes difficult to dye a desired color (in many cases, a dark color).

[0003] It has also been practiced to use a false twisted yarn as a yarn constituting a woven fabric to impart elasticity to the woven fabric. The false twisting yarn has inherent torque due to twisting and untwisting, and the torque imparts elasticity to the yarn. However, this torque not only contributes to the elasticity of the woven fabric, but also tends to transfer to the grain on the woven fabric surface. Therefore, the woven fabric composed of false twisted yarn is
Although the elasticity was good, the surface was apt to be grained. In order to prevent texture from appearing on the fabric, the fabric is subjected to a hot water treatment to reduce the torque of the false twisted yarn, but in this case, although the occurrence of grain is reduced, There is a drawback that the elasticity is reduced. The elongation recovery was also insufficient.

On the other hand, instead of polyurethane elastic fiber yarns or false twisted yarns, two types of polymers having different shrinkage properties or two types of polymers having a difference in intrinsic viscosity, that is, a difference in the degree of polymerization, are joined in a side-by-side type. Crimped conjugate fibers are widely known. For example, Japanese Patent Application Laid-Open No. 64-85317 proposes a side-by-side conjugate fiber containing a polyester having a metal sulfonate group as one component, and is used as a yarn or a woven fabric. It is used as a bulky yarn or a bulky fabric by performing a crimp development treatment in the state. However, when these crimpable conjugate fibers are used for the warp and / or weft of a woven fabric, the yarns are constrained by the weave structure, so that the crimp performance of the conjugate fibers cannot be sufficiently exhibited, and A stretchable fabric could not be obtained.

[0005] Therefore, a side-by-side conjugate fiber having a high crimping property so that the crimping property is sufficiently exhibited even in a woven fabric has been proposed (WO95 / 04846).
However, even a conjugate fiber having sufficient crimping performance has a problem that the texture of the woven or knitted material becomes hard due to a large thermal deformation, that is, a large boiling water shrinkage. As a result of studying to solve this problem, the present inventors have obtained a prospect that the problem can be solved by a crimped conjugate fiber using a polymer having a high shrinkage stress, and proposed in Japanese Patent Application No. 10-236728. did. However, two drawbacks have been pointed out in the conventional side-by-side conjugate fiber, although the stretchability is excellent. One is that the structure is more easily filled in the woven or knitted fabric in order to more easily exhibit the elasticity due to the crimp, and the fabric is rich in weight (feeling heavy). Secondly, when light is applied to the fabric, the fabric has a strong glaring feeling due to internal reflection from the fiber cross section and surface reflection due to the cross-sectional deformation of the low-viscosity polymer. From such a viewpoint, there has been a strong demand for a side-by-side crimped conjugate fiber that is lightweight and has excellent non-glitter property while maintaining excellent crimp characteristics.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional crimpable conjugate fiber, which has a soft feel and a good repulsion force. An object of the present invention is to provide a crimpable conjugate fiber which has excellent crimping properties, has no glare, and is excellent in lightness, which is observed when a fabric is formed using a conventional crimpable conjugate fiber.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a conjugate fiber comprising a specific polymer combination, containing fine particles, and having a specific fiber cross section. It was found that the above object was achieved in the present invention, and reached the present invention.

That is, the present invention is a side-by-side type conjugate long fiber comprising a fine particle-containing polyester (A) satisfying the following formula (1) and a fiber-forming polymer (B) having a melting point of 150 ° C. or higher, and a fiber cross section: Is a crimpable conjugate long fiber having a hollow hole satisfying the following formulas (2) and (3). 0.015 ≦ φ · W ≦ 3.2 (1) φ: Fine particle diameter (μm), W: Fine particle content (% by mass) 1 ≦ α ₁ ≦ 8 (2) α ₁ ; Number of hollow holes 1.5 ≦ α ₂ ≦ 22.0 (3) α ₂ ; hollow ratio (%)

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, it is necessary that at least the polyester (A) contains fine particles. If the polyester (A) does not contain fine particles, the fiberization processability during spinning and drawing is poor, that is, fluff breakage occurs frequently. Further, in the stretched yarn after dyeing, spots in the length direction are apt to occur, which causes streaks of the woven or knitted fabric. The addition of fine particles to the polymer is indispensable for the stabilization of the fiberization process and the reduction of the stain spots. In the present invention, it is more preferable that the fiber-forming polymer (B) also contains fine particles. .

As the type of fine particles to be added to the polymer, for example, titanium oxide, silica, barium sulfate, calcium carbonate, kaolin, sericite and the like are preferably used, and even if two or more of these are appropriately blended and used. Good.

What is important is that the product of the average particle diameter φ (μm) of the fine particles used and the content W (% by mass) of the fine particles is in the range of 0.015 ≦ φ · W ≦ 3.2. is there.
When φW is less than 0.015, the effect of improving the fiberization processability and the effect of reducing the dyeing unevenness in the fiber axis direction of the yarn are small. On the other hand,
When W exceeds 3.2, the effect of reducing staining spots reaches a peak,
Its level does not improve. Also, the fiberization processability tends to be deteriorated probably because secondary aggregation of the fine particles is induced. The average particle diameter φ (μm) of the fine particles is preferably in the range of 0.020 ≦ φ ≦ 2.0 in consideration of the fiberization processability.
Thus, in the present invention, since it is important to set φ · W within the above range, the average particle diameter of the fine particles φ
(μm) and its content W (% by mass) may be set as appropriate according to the purpose.
It is preferable to use fine particles having a size of from 04 μm to 1.0 μm, and to set the content within a range of from 0.5% by mass to 10% by mass.

In order to reduce glare, which is one of the objects of the present invention, it is preferable to select and contain fine particles having a high hiding effect. For example, titanium oxide is preferably used. If the amount is too large, the color development (dark color) of the fabric after dyeing becomes inferior, so it is necessary to maintain the above-mentioned suitable range.

Next, the hollow hole in the fiber cross section, which is an important point for reducing the glare and providing a light weight, which is the main object of the present invention, will be described in detail. In the present invention, it is necessary that the hollow holes formed in the fiber cross section satisfy the following expressions (2) and (3). 1 ≦ α ₁ ≦ 8 (α ₁ ; number of hollow holes) (2) 1.5 ≦ α ₂ ≦ 22.0 (α ₂ ; hollow ratio%) (3)

In order to eliminate the glare (non-glitter property), it is not sufficient to include only the above-mentioned fine particles having a high hiding effect in the polymer, which is insufficient. Is important.
In order to achieve this object, it is very effective to have a hollow inside the cross section of the side-by-side type fiber, and surprisingly, the presence of the hollow and the additive effect of the inclusion of fine particles cause a glare. Drastically decreases. The number α _{1 of the} hollow holes is 1 or more and 8 or less, more preferably 2 or more and 6 or less.
It is as follows. If it is less than 1 (that is, a solid cross section), there is no glare-reducing effect, and if it exceeds 8, the glare-reducing effect reaches a plateau, and furthermore, it becomes difficult to obtain a uniform fiber cross-sectional shape, and the fiberization processability deteriorates. Will be invited. As the side-by-side type composite fiber having such a hollow hole, for example, a fiber having a fiber cross-sectional shape as shown in FIG. 1 can be mentioned.

The hollow ratio α ₂ of the fiber cross section can be appropriately set according to the intended fabric configuration. In the present invention, the hollow ratio α ₂ is suitably 1.5% or more and 22% or less, and more preferably 3% or less. -20%. Hollow ratio alpha ₂ is 1.5%
If the amount is less than 20%, the light weight effect is not recognized. If the amount exceeds 22%, the fiberization processability is liable to be deteriorated, and the texture becomes too tight.

In the present invention, when a woven or knitted fabric is used, a high-quality fabric having more bulkiness, bulge, tension, waist, and excellent elasticity is represented by the following structural formula (I). It is preferable that the compound is copolymerized with the polyester (A) in a specific amount.

Embedded image In the formula, R _{1 to} R ₁₀ are an ester-forming functional group, a hydrogen atom,
A group selected from an alkyl group and R _{1 to} R ₁₀
One or two of them are ester-forming functional groups.
X is 0 or 1, and y is an integer satisfying 1 ≦ x + y ≦ 3.

In the compound represented by the structural formula (I),
Examples of the ester-forming functional group include a hydroxy group, a hydroxyalkyl group, a carboxyl group, and an ester-forming derivative thereof. The alkyl constituting the hydroxyalkyl group is not limited, but is preferably an alkyl having 1 to 4 carbon atoms, such as a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, or a hydroxybutyl group, and may be a branched alkyl.

The ester-forming derivative of a carboxyl group is a carboxylic acid having 1 to 1 carbon atoms such as methyl ester, ethyl ester, propyl ester and butyl ester.
Alkyl esters of 4 are preferred.

The compound represented by the structural formula (I) needs to have one or two ester-forming functional groups, and is highly copolymerized in the polyester molecular chain as a polyester fiber. It is preferable in terms of expression of shrinkage characteristics, polymerizability, and the like, and from this point, it is preferable that the number of ester-forming functional groups is two. In that case, the ester-forming functional groups may be of the same type or of different types. Furthermore, in the compound, a carbon atom to which no ester-forming functional group is bonded has a hydrogen atom and an alkyl group bonded thereto, but a carbon atom to which no ester-forming functional group is bonded in view of not inhibiting the polymerizability. Preferably, a hydrogen atom is bonded. In addition, as an alkyl group, a C1-C5 alkyl group, such as a methyl group, an ethyl group, a propyl group, a butyl group, and a pentyl group, is mentioned, and the said group may be branched.

Examples of such compounds include norbornane 2,3-dimethanol, norbornane 2,3-diethanol, norbornane 2,3-dicarboxylic acid, norbornane 2,3-dicarboxylic acid dimethyl ester, norbornane 2,3-dicarboxylic acid Acid diethyl ester, perhydrodimethanonaphthalenediethanol, perhydrodimethanonaphthalenediethanol, perhydrodimethanonaphthalenedicarboxylic acid, perhydrodimethanonaphthalenedicarboxylic acid dimethyl ester, tricyclodecanedimethanol, tricyclodecanediethanol, tricyclohexane Cyclodecane dicarboxylic acid, tricyclodecane dicarboxylic acid dimethyl ester, tricyclodecane dicarboxylic acid diethyl ester, and the like.In these compounds, an ester-forming functional group is bonded. Compounds in which an alkyl group is bonded to a carbon not even mentioned. Further, a compound in which another substituent other than the alkyl group is bonded is also included in the present invention.

Among the above compounds, norbornane 2,3-dimethanol, norbornane 2,3-dicarboxylic acid, norbornane 2,3-dicarboxylic acid dimethyl ester, Hydrodimethanonaphthalenedimethanol, perhydrodimethanonaphthalenedicarboxylic acid, perhydrodimethanonaphthalenedicarboxylic acid dimethyl ester, tricyclodecane dimethanol, tricyclodecanediethanol, tricyclodecanedicarboxylic acid, tricyclodecanedicarboxylic acid dimethyl ester preferable.

Further, from the viewpoint of polymerizability, norbornane 2,3-dimethanol, norbornane 2,3-dicarboxylic acid, norbornane 2,3-dicarboxylic acid dimethyl ester, perhydrodimethanonaphthalenedimethanol, perhydrodimethanol In naphthalenedicarboxylic acid and perhydrodimethanonaphthalenedicarboxylic acid dimethyl ester, two ester-forming functional groups are preferably located at the trans position.

The polyester in the present invention is a polyester mainly containing terephthalic acid as a main dicarboxylic acid component and at least one alkylene glycol selected from ethylene glycol, trimethylene glycol and tetramethylene glycol as a main glycol component. . Further, a third component other than the compound represented by the structural formula (I) may be copolymerized within a range not to impair the object of the present invention.

As the third component, isophthalic acid,
Phthalic acid, naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid,
4,4'-diphenylmethanedicarboxylic acid, 4,4'-
Diphenylsulfone dicarboxylic acid, 4,4'-diphenylisopropylidene dicarboxylic acid, 1,2-diphenoxyethane-4 ', 4 "dicarboxylic acid, anthracene dicarboxylic acid, 2,5-pyridine dicarboxylic acid, diphenoxy ketone dicarboxylic acid, 5-sodium sulfoisophthalic acid, dimethyl 5-sodium sulfoisophthalate,
Aromatic dicarboxylic acids such as 5-tetrabutylphosphonium sulfoisophthalic acid; aliphatic dicarboxylic acids such as malonic acid, succinic acid, adipic acid, azelaic acid and sebacic acid; alicyclic dicarboxylic acids such as decalin dicarboxylic acid and cyclohexanedicarboxylic acid Hydroxycarboxylic acids such as β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, hydroxypropionic acid, hydroxyacrylic acid;
Carboxylic acids derived from these ester-forming derivatives, aliphatic lactones such as ε-caprolactone; aliphatic diols such as hexamethylene glycol, neopentyl glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol; hydroquinone; Catechol, naphthalene diol, resorcinol, bisphenol A, ethylene oxide adduct of bisphenol A, bisphenol S,
Aromatic diols such as ethylene oxide adduct of bisphenol S; alicyclic diols such as cyclohexane dimethanol; One or more of these third components may be copolymerized.

Also, the polyester (A) of the present invention includes:
Polyhydric carboxylic acids such as trimellitic acid, trimesic acid, pyromellitic acid, and tricarballylic acid within a range where the polyester is substantially linear; polyhydric alcohols such as glycerin, trimethylolethane, trimethylolpropane, and pentaerythritol May be copolymerized.

The copolymerization ratio of the above compound in the polyester (A) is in the range of from 0.5 mol% to 10 mol%, preferably from 3 mol% to 8 mol%, based on the dicarboxylic acid component constituting the polyester. It is. When the content of the compound is less than 0.5 mol%, it is not preferable because sufficient crimping performance and good texture cannot be obtained. On the other hand, if the content of the compound exceeds 10 mol%, it is not preferable because a crystalline polyester is hardly obtained and the thermal deformation, that is, the shrinkage ratio of boiling water increases, and the texture of the woven or knitted fabric becomes hard.

This copolymerized polyester (A) can be polymerized by a usual method. For example, direct esterification of terephthalic acid and alkylene glycol,
Either transesterifying a lower alkyl ester of terephthalic acid such as dimethyl terephthalate with an alkylene glycol or reacting terephthalic acid with an alkylene oxide to produce an alkylene glycol ester of terephthalic acid and / or a low polymer thereof. It is produced by a first-stage reaction, followed by a second-stage reaction in which the reaction product obtained in the first stage is heated under reduced pressure to carry out a polycondensation reaction until a desired degree of polymerization is reached. At that time, the above-mentioned compound can be added at any stage until the polycondensation reaction is completed, for example, added to the starting material of the polyester, or added after the transesterification reaction and before the polycondensation reaction. Further, in order to increase the degree of polymerization, solid phase polymerization may be performed after polymerization in a liquid phase.

The polyester (A) desirably has an intrinsic viscosity (measured at 30 ° C. using a mixed solvent of phenol / tetrachloroethane (mass ratio 50/50)) of 0.5 to 1.5.

The fiber-forming polymer (B) used in the present invention is not particularly limited as long as it has a melting point of 150 ° C. or higher. Examples thereof include polyesters such as ethylene terephthalate polyester and butylene terephthalate polyester, nylon 6, nylon 12 and the like. And polyamides such as nylon 66, which may contain a copolymer component. When the melting point of the fiber-forming polymer (B) is less than 150 ° C., heat setting for imparting a feeling to the composite yarn, high-temperature dyeing, and the like are difficult to perform, which is not practical. Further, if the melting point is too high, the spinnability and the like may be reduced. Therefore, a polymer having a melting point of 270 ° C. or less is preferable.

The conjugate long fiber of the present invention has a form in which the polyester (A) and the fiber-forming polymer (B) are joined in a side-by-side manner in the fiber cross section. Has a composite ratio of polyester (A) and polymer (B) of (A) :( B) = 30:
The ratio is preferably 70 to 70:30, particularly preferably 40:60 to 60:40. Most preferably, both components are 45:
This is a case where the composite spinning is performed at a composite ratio of 55 to 55:45. Whichever the ratio is, the spinnability tends to be poor.

The fiber cross-sectional shape of the conjugate long fiber of the present invention is not particularly limited, and may be a polygonal cross-section such as a round cross-section, an elliptical cross-section, a flat cross-section, a triangle, a square, a pentagon, a hexagon, a T-shaped cross-section, or the like.
Examples include a U-shaped cross section, a W-shaped cross section, a multi-branched cross section, and a multi-leaf cross section. Further, the shape of the hollow hole in the cross section of the composite continuous fiber of the present invention is not limited to a circle, and may be a polygonal shape such as a flat shape, a triangle, a square, a pentagon, and the like. In the present invention, the crimp elongation rate (Y) and the boiling water shrinkage rate (X) of the composite filament satisfy the following expressions (4) and (5), that is, as shown in FIG. In a graph showing the relationship between the shrinkage and elongation and the boiling water shrinkage, it is preferable that both exist in a specific region. 30 ≧ Y ≧ 0.0014X ⁴ −0.0219X ³ + 0.1409X ² + 0.0211X + 3.6 (4) 2 ≦ X ≦ 13 (5) X: boiling water shrinkage% Y: crimp elongation%

The crimp elongation Y is (0.0014X ⁴ −0.0219X ³ +0.1
409X ² + 0.0211X + 3.6) can not be obtained enough texture in woven or knitted fabric is less than. On the other hand, when the crimp elongation is more than 30%, the texture becomes unpleasant, which is not preferable. More preferably 25 ≦ y ≦ 0.0025X ³ + 0.0639X ² +0.17
32X + 11.5.

When the boiling water shrinkage ratio X is less than 2%, the crimping performance is insufficient and the stretching processability is deteriorated, which is not appropriate. If the boiling water shrinkage is more than 13%, the texture of the woven or knitted fabric becomes hard, which is not appropriate. Preferably, the boiling water shrinkage is 3
% Or more and 12% or less.

The conjugate long fibers of the present invention have a crimp fastness of 10% or less, which is superior to conventional ones. In long-term use, sag is small and texture and characteristics can be maintained. Further, the composite fiber of the present invention has a high stress at the time of heat shrinkage, and is 0.13 cN / dtex or more, particularly 0.1
Since it has a high stress of 8 cN / dtex or more, it can exhibit sufficient bulkiness even if it is constrained by the structure of the woven fabric, and can have excellent swelling and tightness.

The polymer constituting the composite continuous fiber of the present invention may contain an antioxidant, an ultraviolet absorber, a fluorescent whitening agent, a matting agent, an antistatic agent, if necessary, within a range not to impair the present invention. It may contain additives such as a flame retardant, a flame retardant auxiliary, a lubricant, a coloring agent, a plasticizer, and an inorganic filler.

The conjugate long fiber of the present invention can be produced by using a known melt conjugate spinning apparatus. The conjugate fiber satisfying the above-mentioned specified relationship between the crimp elongation rate and the boiling water shrinkage rate is used. In order to do so, it is preferable to employ the following spinning and drawing conditions in the fiberizing step. 2,000 m / min ≤ spinning speed ≤ 3500 m / min rupture draw ratio of the spun yarn × 0.68 ≤ draw ratio ≤ breakage ratio of the spun yarn × 0.80 150 ° C ≤ drawing hot plate temperature

The viscosity of the polyester (A) and the fiber-forming polymer (B) is preferably set to satisfy the following formula from the viewpoint of crimp elongation performance and the ability to pass through the spinning / drawing process. 800poise (80 Pascals _{sec) <η 0 (A) -η} 0 (B) <8800po
ise (880 Pascal seconds) η ₀ : Melt viscosity at 290 ° C when Shear rate is 0

Further, in order to form the above-mentioned hollow hole in the fiber cross section, a conventional hollow fiber spinning nozzle combined with an arc-shaped slit can be used.
For example, when the difference in melt viscosity between the polyester (A) and the fiber-forming polymer (B) is large, the width of the slit on the side where the high-viscosity polymer is discharged is set to be greater than the width of the slit on the side where the low-viscosity polymer is discharged. It is preferable to take measures such as widening.

[0039]

EXAMPLES The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples. The method for measuring the characteristic values and the like in the examples is as follows.

Intrinsic viscosity: Measured at 30 ° C. using a mixed solvent of phenol / tetrachloroethane (mass ratio 50/50).

Melt viscosity: Capillograph (manufactured by Toyo Seiki)
Was used to measure the solvent viscosity η ₀ at a shear rate of ₀ at 290 ° C.

Boiling water shrinkage: The sample was marked at 50 cm intervals under an initial load of 1.11 mg / dtex, then the sample was left in hot water at 98 ° C. under a load of 5.6 mg / dtex for 30 minutes, and then removed to remove 1.11 mg / dtex. The distance L'cm between the marks was measured under a load of mg / dtex, and calculated by the following equation. Boiling water shrinkage (%) = [(50−L ′) / 50] × 100

Crimp elongation rate: 1.11 mg / dtex load was applied to the sample.
Remove the load after drying for 30 minutes with 90 ° C boiling water
I do. After applying a load of 1.11mg / dtex, the length is 5 minutes
Sa1 ₁And then apply 0.111mg / dtex load for 30 seconds
Back length 1_TwoWas measured and calculated by the following equation. Crimp elongation rate = [(1_Two-1₁) / 1_Two] X 100

The crimp fastness: crimp elongation at measurement 1 ₂ to further remove after applying a load 0.78 mg / dtex 30 seconds 1.11
5 minutes after standing under mg / dtex length 1 ₃ it was calculated by the measured following equation. Crimping fastness _{= [(1 2 -1 3)} / 1 2] × 100

Texture: The initial texture, extensibility, swelling, softness, tension, and stiffness were evaluated by sensory evaluation as follows: ◎: Very good ○: Excellent △: Somewhat poor ×: Poor

Further, with respect to the sample whose initial feeling was evaluated, 100 g of the sample was put into an electric washing machine containing 40 g of a neutral detergent and 20 liters of water, and the washing time was 6 minutes, the dehydration time was 1 minute, the rinsing time was 8 minutes, and the After being washed for 2 minutes under the condition, the sample is washed by natural drying, and then a load of 50 g is applied to the sample for 1 minute. After repeating washing and loading 30 times, the texture was evaluated in the same manner as the initial texture.

Production Example 1 of Polyester (A) Tricyclodecane-2,2-dimethanol (TC2-2)
DM) 4.2 mol%, ethylene glycol 95.
From a diol raw material consisting of 8 mol% and terephthalic acid,
A slurry was formed by adjusting the molar ratio of the diol raw material: terephthalic acid to 1.2: 1, and the slurry was pressurized [absolute pressure 2.5 kg / cm ² (2.45 × 10 ⁵ Pa)] at a temperature of 250. ° C
The esterification reaction was carried out until the esterification ratio became 95% to produce a low polymer. Next, 350 ppm as a catalyst
Was added and the low polymer was polycondensed at 280 ° C. for 1.5 hours under a reduced pressure of 133 Pa to produce a polyester having an intrinsic viscosity [η] of 0.72 dl / g. This polyester was extruded into a strand shape from a nozzle and cut to produce a columnar chip having a diameter of 2.8 mm and a length of 3.2 mm.

<Example 1> [η] = 0.83 as the polyester A component (average particle size 0.15 μm as fine particles)
Of polyethylene terephthalate (melting point: 259 ° C.) containing 0.45% by mass of TiO ₂ and [η] = 0.60 (the type of fine particles, the average particle diameter, and the addition amount are the same as those of the component A) as the component B Spinning temperature: 295 ° C. using a normal melt spinning apparatus using polyethylene terephthalate, nozzle: one-hole hollow nozzle [FIG. 3 (2)], spinning speed of 300
The yarn was spun at 0 m / min to obtain a side-by-side composite undrawn yarn having a composite mass ratio of 50:50. 85 of this undrawn yarn
Preheated at 1.7 ° C. and 1.7 times (rupture draw ratio of spun original yarn × 0.
7) After stretching, heat treatment at 170 ° C using a hot plate and 111 dt
An ex / 24f drawn yarn was obtained. The obtained drawn yarn was made into a tubular knitted fabric and heat-treated at 160 ° C. for 10 minutes. The obtained tubular knitted fabric had no glare, was excellent in lightness, and was excellent in both the initial texture and the texture after washing and loading. Tables 1 and 2 show the details of the polyester (A) and the polymer (B), the physical properties of the fibers and the results of the evaluation of the feeling.

[0049]

[Table 1]

[0050]

[Table 2]

<Example 2> A drawn yarn was prepared in the same manner as in Example 1 except that a three-hole hollow nozzle was used as a nozzle.
A tubular knitted fabric was prepared, and fiber properties and texture were evaluated.

<Example 3> The same procedure as in Example 2 was carried out except that the copolymerized polyester obtained in Production Example 1 was used as the polyester A component. It had no glare and was excellent in lightness. In particular, it had very good initial texture including elasticity and texture after washing and loading (see Tables 1 and 2).

Examples 4 and 5 Fiberization and knitting of a tubular knitted fabric were carried out in the same manner as in Example 2 except that the molar amount of the copolymer component of the copolymerized polyester was changed according to Table 1. The obtained knitted fabric had no glare, was excellent in lightness, and had excellent initial texture and texture after washing and load application (Table 1).
And Table 2).

<Example 6> Fiber formation and formation of a tubular knitted fabric were performed in the same manner as in Example 1 except that the nozzle was a two-hole hollow nozzle. The resulting knitted fabric had no glare, was excellent in lightness, and had excellent initial texture and texture after washing and load application (see Tables 1 and 2).

<Examples 7 and 8> Fiberization and formation of a tubular knitted fabric were performed in the same manner as in Example 1 except that the stretching conditions were as described below. The obtained knitted fabric is
The texture after loading was very good (see Tables 1 and 2). (Example 7) Stretching ratio (HD) = 1.75 (HDmax × 0.72) Stretching temperature = 155 ° C. (Example 8) Stretching ratio (HD) = 1.80 (HDmax × 0.74) Stretching temperature = 150 ° C

Example 9 Polymer (B) was converted to nylon 6
The procedure of Example 2 was repeated, except that the fiber knitting was performed. The obtained knitted fabric was excellent in the initial texture and the texture after washing and load application (see Tables 1 and 2).

<Examples 10 to 13> The procedures were performed in the same manner as in Example 2 except that the fine particles and the copolymer components contained in the polyester A component were as shown in Table 1. (Tables 1 and 2)
reference). The average particle size of the fine particles used was SiO ₂ (0.045
μm), TiO ₂ (0.15 μm), BaSO ₄ (0.28 μm)
m).

<Comparative Example 1> Example 2 was repeated except that a polymer to which no fine particles were added was used for both component A and component B.
Fiberization was performed in the same manner as described above, but the fiberization processability (spots and fluffing) was poor, and in the tubular knitted fabric made from the obtained fibers, the feeling of glare was poor (see Table 1). 1 and Table 2).

<Comparative Example 2> Fiberization and formation of a tubular knitted fabric were performed in the same manner as in Example 1 except that the hollow nozzle was not used. The obtained knitted fabric had poor lightness and glare (see Tables 1 and 2).

Comparative Example 3 The same operation as in Example 2 was performed except that the molar amount of the copolymer component of the polyester (A) was changed according to Table 1. The initial texture and the texture after washing / loading were poor (see Tables 1 and 2).

Comparative Examples 4 and 5 Fiberization and knitting of a tubular knitted fabric were carried out in the same manner as in Example 2 except that the fine particles added to the polyester A component and the amounts added were as shown in Table 1. Comparative Example 4 was inferior in glaring feeling and fiberization processability (fluffing), and Comparative Example 5 was inferior in fiberization processability due to frequent thread breakage (see Tables 1 and 2).

Comparative Example 6 Fiberization was carried out in the same manner as in Example 1 except that the hollow nozzle was not used, and the fine particles added to the polyester A component and the amount added were as shown in Table 1.
A tubular knitted fabric was prepared, but the fiberization processability, lightness, and coloring after dyeing were poor (see Tables 1 and 2).

[Brief description of the drawings]

FIG. 1 is a fiber sectional view showing a hollow form formed in a conjugate long fiber of the present invention.

FIG. 2 is a graph showing a relationship between a crimp elongation rate and a boiling water shrinkage rate of the conjugate long fiber of the present invention.

FIG. 3 is a nozzle plan view showing an example of the shape of a spinning nozzle for producing the composite long fiber of the present invention.

[Explanation of symbols]

 A: Polyester (A) B: Fiber-forming polymer (B)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Sueyoshi 1-12-39 Umeda, Kita-ku, Osaka-shi, Osaka F-term in Kuraray Co., Ltd. (Reference) 4L035 AA08 BB33 BB77 BB89 BB91 DD03 EE01 EE20 FF10 JJ05 JJ09 KK01 4L041 AA08 AA20 AA25 BA02 BA05 BA09 BA37 BA38 BA40 BA42 BA43 BA59 BC05 BC17 BC20 BD14 CA06 CA10 CA21 CB05 CB06 CB25 DD01 DD04 DD14 DD15 DD22 4L045 AA05 BA03 BA21 BA24 BA36 BA60 CA25 DA42 DC03

Claims (6)

[Claims] 1. A side-by-side type bicomponent long fiber comprising a fine particle-containing polyester (A) satisfying the following formula (1) and a fiber-forming polymer (B) having a melting point of 150 ° C. or higher, and (3) A crimpable conjugated continuous fiber characterized by having hollow holes satisfying the formulas (3) and (3). 0.015 ≦ φ · W ≦ 3.2 (1) φ: Fine particle diameter (μm), W: Fine particle content (% by mass) 1 ≦ α ₁ ≦ 8 (2) α ₁ ; Number of hollow holes 1.5 ≦ α ₂ ≦ 22.0 (3) α ₂ ; hollow ratio (%) 2. The polyester (A) has the following structural formula (I)
The crimpable conjugate long fiber according to claim 1, which is a polyester obtained by copolymerizing the compound represented by the formula (1) with 0.5 mol% or more and 10 mol% or less. Embedded image In the formula, R _{1 to} R ₁₀ are an ester-forming functional group, a hydrogen atom,
A group selected from an alkyl group and R _{1 to} R ₁₀
One or two of them are ester-forming functional groups.
X is 0 or 1, and y is an integer satisfying 1 ≦ x + y ≦ 3. 3. The crimped conjugate long fiber according to claim 2, wherein the relationship between the boiling water shrinkage (X) and the crimp elongation (Y) satisfies the following formulas (4) and (5). 30 ≧ Y ≧ 0.0014X ⁴ −0.0219X ³ + 0.1409X ² + 0.0211X + 3.6 (4) 2 ≦ X ≦ 13 (5) X; boiling water shrinkage (%) Y; crimp elongation (%) 4. The crimpability according to claim 1, wherein the fine particles contain at least one selected from the group consisting of titanium oxide, silica, barium sulfate and calcium carbonate as a main component. Composite long fiber. 5. The crimped conjugate long fiber according to claim 1, wherein the basic skeleton of the fiber-forming polymer (B) having a melting point of 150 ° C. or higher is a polyester of 85 mol% or more. 6. The crimped conjugate long fiber according to claim 1, wherein the fiber-forming polymer (B) having a melting point of 150 ° C. or more contains polyamide as a main component.