JP5992238B2 - Latent crimped polyester composite fiber yarn and its woven or knitted fabric - Google Patents

Description

  The present invention relates to a latent crimpable polyester composite fiber yarn, and in particular, when used as a woven or knitted fabric, the latent crimpable polyester composite fiber yarn and the composite fiber excellent in stretch properties, surface smoothness and softness. The present invention relates to a woven or knitted fabric using yarn.

  A fiber made of a polyester resin represented by polyethylene terephthalate (hereinafter abbreviated as PET) has excellent mechanical properties and chemical properties, and is used in a wide range of applications. One of the uses is a woven or knitted fabric having stretch properties.

  Many latent crimped polyester composite fibers in which polyester resins having different heat shrinkage properties are joined in a side-by-side type or an eccentric core-sheath type have been proposed as fibers for imparting stretch properties to a woven or knitted fabric. The latent crimped polyester composite fiber can impart stretchability to the woven or knitted fabric by applying heat treatment after weaving and knitting to develop crimp.

  In addition to the above stretch properties, two types of PET having different intrinsic viscosities are bonded to the side-by-side type as a soft texture with a feeling of swelling to the woven or knitted fabric, and the bonding surface of the two types of PET in the fiber cross section is Composite fibers and composite multifilaments that are curved into a specific shape are known (see, for example, Patent Documents 1 and 2).

  However, in recent years, there has been a demand for a woven or knitted fabric that is more excellent in stretchability than the woven or knitted fabric made of the multifilament.

  As a method of imparting further stretchability to the woven or knitted fabric made of the multifilament, a method of increasing the single yarn fineness of the multifilament or a method of lowering the heat setting temperature when the multifilament is produced can be considered.

  However, if the single yarn fineness is large as described above, the resulting woven or knitted fabric has problems such as poor surface smoothness, occurrence of embossing defects, and a hard texture. Further, when the heat setting temperature is lowered as described above, there is a problem that the shrinkage of the multifilament is increased and the texture is hardened when heat treatment is performed to develop latent crimp.

  As described above, in the case of a woven or knitted fabric, the present situation is that a latent crimpable polyester fiber yarn having excellent stretch properties and excellent surface smoothness and texture has not been obtained yet. .

Japanese Patent Laid-Open No. 11-241229 JP 2000-212838 A

  The present invention solves various problems in the prior art and has a stretchability superior to that of a conventional crimped polyester composite fiber having superior surface smoothness and softness when made into a woven or knitted fabric. It is a technical problem to provide a woven or knitted fabric composed of a yarn and the composite fiber yarn.

  The inventors of the present invention have arrived at the present invention as a result of intensive studies to solve the above problems. That is, the gist of the present invention is as follows (1) to (4).

(1) High heat-shrinkable polyester (A) containing terephthalic acid as a polybasic acid component and ethylene glycol, an ethylene oxide adduct of bisphenol A, neopentyl glycol and diethylene glycol as a polyhydric alcohol component, and polyethylene terephthalate or ethylene terephthalate A high heat-shrinkable polyester, comprising a bundle of latent crimpable polyester composite fibers joined together in a side-by-side type or an eccentric core-sheath type with a low heat-shrinkable polyester (B) comprising a polyester mainly composed of units, The content (Ma (mol%)) of the ethylene oxide adduct of bisphenol A with respect to the total polyhydric alcohol component of (A) satisfies the formula (I), and the total polyhydric alcohol component of the high heat shrinkable polyester (A) Against the neopen The content ratio (Mb (mol%)) of glycol satisfies the formula (II), and the content ratio (Mc (mol%)) of the diethylene glycol with respect to all the polyhydric alcohol components of the high heat shrinkable polyester (A) is III), the total content of the ethylene oxide adduct of bisphenol A and the content of neopentyl glycol (Ma + Mb) (mol%) satisfies the formula (IV), and the yarn has a three-dimensional spiral shape. A latent crimpable polyester composite fiber yarn characterized by having an actual crimp.
4 ≦ Ma (mol%) ≦ 10 (I)
3 ≦ Mb (mol%) ≦ 10 (II)
Mc (mol%) ≦ 2.0 (III)
7 ≦ Ma + Mb (mol%) ≦ 14 (IV)
Ma: Content of ethylene oxide adduct of bisphenol A (mol%)
Mb: Neopentyl glycol content (mol%)
Mc: Diethylene glycol content (mol%)

(2) The actual crimp rate (C0 (%)) and the latent crimp rate (C100 (%)) of the latent crimpable polyester composite fiber yarn satisfy the formulas (V) and (VI). The latent crimpable polyester composite fiber yarn according to (1) above.
0 <C0 (%) ≦ 18 (V)
30 ≦ C100 (%) ≦ 50 (VI)
C0 (%) = [(L0−L1) / L0] × 100
C100 (%) = [(A0−A1) / A0] × 100
L1: Knot length while applying a tension of 90.91 × 10 ⁻³ cN / dtex to the yarn, applying a load of 1.67 × 10 ⁻⁴ cN / dtex to the knot, and standing for 30 minutes L0: After the L1 measurement, the length A1: when the load is changed from 1.67 × 10 ⁻⁴ cN / dtex to 90.91 × 10 ⁻³ cN / dtex, the yarn has 90.91 × 10 ⁻³ cN / dtex. After removing the wrinkle while applying tension, the load of 1.67 × 10 ⁻⁴ cN / dtex was applied to the reed for 30 minutes, and then the load of 1.76 × 10 ⁻³ cN / dtex was applied and left for 30 minutes. Saddle length A0: Strain length when the load is changed from 1.76 × 10 ⁻³ cN / dtex to 4.4 × 10 ⁻² cN / dtex after A1 measurement

  (3) The latent crimpable polyester composite fiber yarn according to (1) or (2), wherein the ethylene oxide adduct of bisphenol A is composed of a compound represented by the following chemical formula (1).

  (4) A woven or knitted fabric comprising the latently crimpable polyester composite fiber yarn according to any one of (1) to (3) above.

  The latent crimpable polyester composite fiber yarn of the present invention is excellent in latent crimp expression and thermal stability, and the woven or knitted fabric using the yarn has a stretch property superior to that of the prior art, and Excellent surface smoothness and softness.

It is a cross-sectional schematic diagram of this composite fiber showing the side-by-side type | mold which is one embodiment of the composite shape of the composite fiber which comprises the thread | yarn of this invention. It is a cross-sectional schematic diagram of this composite fiber showing the eccentric core-sheath type | mold which is one embodiment of the composite shape of the composite fiber which comprises the thread | yarn of this invention.

  Hereinafter, the present invention will be described in detail.

  In the present invention, the high heat-shrinkable polyester (A) mainly comprises an ethylene glycol unit composed of terephthalic acid and ethylene glycol, and contains an ethylene oxide adduct of bisphenol A (hereinafter abbreviated as BPAEO) as a copolymerization component. There is a need. The BPAEO is preferably composed of a compound in which 1 to 4 mol parts of ethylene oxide are added to 1 mol part of bisphenol A as represented by the following chemical formula (1), and m + n = 2 in the following chemical formula (1). More preferably, it consists of a compound.

  When the high heat-shrinkable polyester (A) contains BPAEO as a copolymerization component, the heat-shrinkability of the portion occupied by the high-heat-shrinkable polyester (A) in the composite fiber is reduced by the low heat-shrinkable polyester (B) in the composite fiber. Is significantly higher than the heat shrinkability of the portion occupied by. As a result, the composite fiber and the yarn formed by converging the composite fiber have a three-dimensional spiral-like manifest crimp, and heat treatment of the woven or knitted fabric using the yarn, for example, by heat treatment after yarn production. By doing so, it becomes excellent in the latent crimp expression property in which a three-dimensional spiral latent crimp is developed. Here, the three-dimensional spiral shape means a three-dimensional form that is a coil (spiral) spring shape.

  When bisphenol A is used instead of BPAEO, that is, a compound to which ethylene oxide is not added, the reactivity with the polybasic acid component is deteriorated and the degree of polymerization is not increased. Furthermore, the high heat shrinkable polyester (A) Also, the thermal stability is poor. Then, the reactivity with a polybasic acid component can be improved by using BPAEO to which ethylene oxide is added.

  When BPAEO is composed of the compound represented by the chemical formula (1), the resulting composite fiber yarn is particularly excellent in latent crimp expression, and the woven or knitted fabric composed of the yarn is particularly excellent in softness. Since it becomes a thing, it is preferable. Furthermore, in the chemical formula (1), when it is composed of a compound with m + n = 2, the glass transition point of the high heat-shrinkable polyester (A) becomes higher, so that the resulting composite fiber yarn exhibits latent crimp. In addition to the properties and texture, it is more preferable because it has excellent thermal stability.

  In the present invention, the content of BPAEO needs to be in the range of 4 to 10 mol% with respect to the total polyhydric alcohol component of the high heat-shrinkable polyester (A), and is preferably 4 to 7 mol%.

  When the content is less than 4 mol%, when the obtained composite fiber yarn is used to form a woven or knitted fabric, the woven or knitted fabric cannot obtain a sufficient stretch property. When the content exceeds 10 mol%, not only the operability in spinning is remarkably deteriorated, but the quality of the woven or knitted fabric using the obtained composite fiber yarn is deteriorated, and only the obtained composite fiber yarn is used. When used as a woven or knitted fabric, the woven or knitted fabric has poor surface smoothness, and further has a wrinkled standing defect. When the content is 4 to 7 mol%, the woven or knitted fabric made of the obtained composite fiber yarn is particularly excellent in surface smoothness, which is preferable.

  In the present invention, the high heat-shrinkable polyester (A) needs to further contain neopentyl glycol (hereinafter sometimes abbreviated as NPG) as a copolymerization component.

  When the high heat-shrinkable polyester (A) contains NPG in addition to BPAEO as a copolymerization component, the resulting woven or knitted fabric made of composite fiber yarns is particularly excellent in softness.

  In this invention, the content rate of NPG with respect to all the polyhydric alcohol components of high heat-shrinkable polyester (A) needs to exist in the range of 3-10 mol%, and it is preferable that it is 4-9 mol%.

  When the content is less than 3 mol%, the woven or knitted fabric is inferior in softness when the obtained composite fiber yarn is used to form a woven or knitted fabric. On the other hand, if it exceeds 10 mol%, the composite fiber is excessively kneaded at the time of spinning, resulting in poor spinning stability. When the content is 4 to 9 mol%, the woven or knitted fabric is preferable because it is particularly excellent in softness and surface smoothness.

  In the present invention, when the high heat-shrinkable polyester (A) contains BPAEO and NPG as copolymerization components, the resulting composite fiber yarn gives high stretchability and excellent softness to the woven or knitted fabric made of the yarn. be able to. The reason for this is not clear, but NPG gives softness to the composite fiber yarn, and the spiral crimp in which the high latent crimp expression performance given by the BPAEO is expressed by heat treatment or the like is combined. It is presumed that excellent softness can be imparted to the woven or knitted fabric.

  In the present invention, the content of diethylene glycol (hereinafter sometimes abbreviated as DEG) with respect to all polyhydric alcohol components in the high heat-shrinkable polyester (A) needs to be 2 mol% or less.

  In the present invention, DEG causes a decrease in the melting point and crystallinity of the high heat-shrinkable polyester (A). In addition to intentional inclusion, DEG is generated as a by-product in the polymerization of the high heat-shrinkable polyester (A). To do.

  In the polymerization of the polyester by the direct polymerization method, a by-product of DEG is accompanied during the transesterification reaction. When the said content rate exceeds 2.0 mol%, the crystallinity of highly heat-shrinkable polyester (A) will fall. Polyesters containing isophthalic acid (hereinafter sometimes abbreviated as IPA) as an essential copolymer component are known as high heat-shrinkable polyesters. However, the present inventors have found that the amount of DEG produced as a by-product of the polyester increases due to the copolymerization of the IPA. Therefore, in the present invention, the content of DEG in the high heat-shrinkable polyester (A) is reduced by using the BPAEO and the NPG as essential copolymer components without using the IPA as an essential copolymer component. The resulting composite fiber has high crystallinity, and the woven or knitted fabric made of the composite fiber is excellent in softness while exhibiting excellent stretch properties.

  If the content is less than 0.1 mol%, it is necessary to highly control the polymerization reaction step, which tends to increase the cost. When the content is 0.5 to 1.8 mol%, it is preferable from the viewpoint of balance between cost and performance of the obtained composite fiber yarn.

  As a method for suppressing the by-production of DEG, in addition to not selecting IPA as a copolymerization component, it is possible to appropriately select a catalyst amount and polymerization conditions.

  In the present invention, the total of the BPAEO copolymerization amount and the NPG content must be 7 to 14 mol%, and preferably 11 to 13 mol%.

  When the total content is 7 mol% or less, when the resulting composite fiber yarn is used to form a woven or knitted fabric, the woven or knitted fabric cannot obtain sufficient stretchability and softness. On the other hand, when the total amount of copolymerization exceeds 14 mol%, when the resulting composite fiber yarn is used to form a woven or knitted fabric, the woven or knitted fabric has good stretchability but poor surface smoothness, Is not preferred because it stands out. When the content is from 11 to 13 mol%, the woven or knitted fabric is particularly excellent in stretch properties, which is preferable.

  The high heat-shrinkable polyester (A) is particularly preferably a polyester in which the polybasic acid component contains 95 mol% or more of terephthalic acid. Furthermore, the high heat-shrinkable polyester (A) is particularly preferably a polyester composed only of terephthalic acid, ethylene glycol, BPAEO, NPG and DEG.

  When the high heat-shrinkable polyester (A) is the above polyester, the obtained composite fiber yarn is likely to be excellent in latent crimp development and crystallinity, and the woven or knitted fabric made of the composite fiber yarn is stretchable. And the softness tends to be particularly excellent.

  In the present invention, the high heat-shrinkable polyester (A) may contain other copolymer components as long as the effects of the present invention are not impaired.

  For example, polybasic acid components other than terephthalic acid include aliphatic dicarboxylic acids such as isophthalic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, hydrogenated dimer acid, and 1,4 -Arocyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, aromatic dicarboxylic acids such as 5-sodium sulfoisophthalic acid, 2,6-naphthalenedicarboxylic acid, orthophthalic acid, trimellitic acid and the like.

  In addition, polyhydric alcohol components other than ethylene glycol, BPAEO, NPG and DEG include triethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol. , Dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, 2-ethyl-2-butylpropanediol, 2-methyl-1,3-propanediol, 1,4-cyclohexanedimethanol, 2,2-bis Examples include alkylene oxide adducts of (4-hydroxyphenyl) propane, tricyclodecane glycols, trimethylolethane, and trimethylolpropane.

  In addition, the high heat-shrinkable polyester (A) includes an antioxidant such as a hindered phenol compound, a color improver such as a cobalt compound, a fluorescent agent, and a dye, and titanium dioxide as long as the essential characteristics are not impaired. Contains various modifiers and additives such as pigments, light resistance improvers such as cerium oxide, flame retardants, antistatic agents, conductivity-imparting agents, antibacterial agents, matting agents, UV absorbers, and ceramics. May be.

  In the present invention, the intrinsic viscosity of the high heat-shrinkable polyester (A) is preferably 0.58 to 0.80. When the intrinsic viscosity of the high heat-shrinkable polyester (A) is less than 0.58, it is difficult to obtain a composite fiber yarn having sufficient spiral crimp expression. On the other hand, when the intrinsic viscosity exceeds 0.80, spinning operability is likely to be remarkably deteriorated, for example, kneeling occurs during spinning and yarn breakage occurs frequently. As will be described later, when PET, which is one of the preferred embodiments as the low heat-shrinkable polyester (B), is used, the intrinsic viscosity of the PET usually used is 0.58 to 0.66. The intrinsic viscosity of the high heat shrinkable polyester (A) is preferably 0.70 to 0.80.

  In the present invention, the glass transition temperature (Tg) of the high heat-shrinkable polyester (A) is preferably 70 to 80 ° C, particularly preferably 75 to 80 ° C.

  When the Tg is less than 70 ° C., the crystallinity of the high heat-shrinkable polyester (A) is low, and the resulting composite fiber yarn tends to be inferior in thermal stability. Since the Tg of ordinary PET is about 78 ° C., the Tg of the high heat-shrinkable polyester (A) does not exceed 80 ° C. unless a component that increases the rigidity of the polyester such as naphthalenedicarboxylic acid is copolymerized. It is not preferable to copolymerize a component that becomes more rigid as the Tg exceeds 80 ° C., since it tends to inhibit the development of latent crimps.

  In the present invention, since the high heat-shrinkable polyester (A) is a polyester having BPAEO and NPG as a copolymer component, for example, crystals of a composite fiber obtained by comparison with a conventional polyester having IPA as a copolymer component The property can be made high. As a result, since the Tg of the high heat-shrinkable polyester (A) is relatively high, the composite fiber yarn of the present invention is excellent in thermal stability. Further, the copolymer composition and the ratio of the high heat-shrinkable polyester (A) can be adjusted so that the Tg of the high heat-shrinkable polyester (A) satisfies the above range, and thus spinning for obtaining a composite fiber yarn can be achieved. The temperature of the drawing heat treatment can be increased, and the resulting composite fiber yarn is softened by the heat treatment for developing the latent crimps.

  In the present invention, the low heat-shrinkable polyester (B) is not particularly limited as long as it is a polyester mainly composed of PET or ethylene terephthalate units, but the heat-shrinkability is lower than that of the high heat-shrinkable polyester (A). Since it is required, it is preferable to use PET in which the ethylene terephthalate unit is 95 mol% or more of all repeating units.

  In the present invention, the low heat-shrinkable polyester (B) may contain other copolymer components as long as the effects of the present invention are not impaired, like the high heat-shrinkable polyester (A). Furthermore, antioxidants such as hindered phenol compounds, cobalt compounds, fluorescent agents, color improvers such as dyes, pigments such as titanium dioxide, light resistance improvers such as cerium oxide, flame retardants, antistatics Various modifiers and additives such as agents, antibacterial agents and ceramics may be contained.

  In the present invention, the intrinsic viscosity of the low heat shrinkable polyester (B) is preferably 0.44 to 0.66. If the intrinsic viscosity of the low heat-shrinkable polyester (B) is less than 0.44, the spinning operability is likely to be deteriorated, such as the occurrence of kneeling and frequent yarn breakage during spinning, and the intrinsic viscosity is more than 0.66. It is difficult to obtain a composite fiber yarn having a spiral crimp expression. Moreover, when PET which is one of the preferred embodiments as the low heat shrinkable polyester (B) is used as described above, the intrinsic viscosity of the low heat shrinkable polyester (B) is preferably 0.58 to 0.66. .

  In the conjugate fiber of the present invention, the intrinsic viscosity difference between the high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B) is not particularly limited, but is desirably 0.07 or more and 0.25 or less.

  When the above intrinsic viscosity difference is less than 0.07, the expression of latent crimps of the obtained composite fiber yarn tends to be insufficient, and the resulting woven or knitted fabric tends to be inferior in stretchability. On the other hand, when the above intrinsic viscosity difference exceeds 0.25, when the composite flow of each polyester is discharged from the spinneret, the bending of the composite fiber proceeds excessively, and the composite fiber adheres to the spinneret and is cut. It is easy to carry out stable spinning.

  In the present invention, the mass ratio (A / B) of the high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B) is preferably in the range of 40/60 to 60/40. Outside this range, it is difficult for the resulting composite fiber yarn to exhibit sufficient crimping performance.

  In the present invention, the high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B) need to be joined to the side-by-side type or the eccentric core-sheath type along the longitudinal direction of the composite fiber.

  1A and 1B are schematic cross-sectional views of a composite fiber representing a side-by-side type which is an embodiment of the composite shape of the composite fiber constituting the yarn of the present invention. As a side-by-side type in the present invention, the joint surfaces of the two types of polyester shown in FIG. 1A are linear and substantially equally joined, or the joint surfaces shown in FIG. What is joined is mentioned.

  FIG. 2 is a schematic cross-sectional view of the composite fiber representing an eccentric core-sheath type which is an embodiment of the composite shape of the composite fiber constituting the yarn of the present invention. As an eccentric core-sheath type in the present invention, one in which one polyester shown in FIG. 2 is a sheath and the other polyester is a core, and the centers of the core and the sheath do not coincide with each other. In the present invention, it is preferable that the sheath part is a high heat shrinkable polyester (A) and the core part is a low heat shrinkable polyester (B).

  In addition, the fineness of the composite fiber constituting the composite fiber yarn of the present invention is not particularly limited, but is preferably 0.9 dtex or more and 2 dtex or less. When the fineness is 0.9 dtex or more, the obtained composite fiber yarn has excellent expression of crimping performance, and it becomes easy to obtain a woven or knitted fabric having sufficient stretch performance. On the other hand, when the fineness is 2 dtex or less, the woven or knitted fabric made of the obtained composite fiber yarn tends to have good softness.

  The latent crimpable polyester composite fiber yarn of the present invention needs to have a three-dimensional spiral-like manifest crimp.

  As described above, the three-dimensional spiral-shaped manifested crimp is a crimp having a three-dimensional form that is a coil (spiral) spring shape. The fiber has the actual crimp and also has the actual crimp as a yarn formed by converging the composite fiber. The actual crimp is mainly caused by a process such as spinning or drawing due to a difference in heat shrinkage between two kinds of polyesters constituting the composite fiber. In particular, when the spinning speed at the time of spinning is 2000 m / min or more, the actual crimp is likely to occur.

  The actual crimp rate (C0) in the present invention is preferably 0 <C0 (%) ≦ 18, and more preferably 0.5 ≦ C0 (%) ≦ 18.

Here, the actual crimp rate (C0) can be expressed by the following equation.
C0 (%) = [(L0−L1) / L0] × 100
L1: Knot length while applying a tension of 90.91 × 10 ⁻³ cN / dtex to the yarn, applying a load of 1.67 × 10 ⁻⁴ cN / dtex to the knot, and standing for 30 minutes L0: After measuring L1, the length when the load is changed from 1.67 × 10 ⁻⁴ cN / dtex to 90.91 × 10 ⁻³ cN / dtex

  When the actual crimp rate exceeds 18%, when the resulting woven or knitted fabric is composed only of the composite fiber yarn, the woven or knitted fabric has a poor surface smoothness and is liable to cause a wrinkle-standing defect. Further, when the actual crimp rate is less than 0.5%, the resulting woven or knitted fabric made of the composite fiber yarn tends to have poor stretchability.

  The latent crimp rate (C100) in the present invention is preferably 30 ≦ C100 (%) ≦ 50, and more preferably 35 ≦ C100 (%) ≦ 45.

Here, the latent crimp rate (C100) can be expressed by the following equation.
C100 (%) = [(A0−A1) / A0] × 100
A1: The yarn was removed while applying a tension of 90.91 × 10 ⁻³ cN / dtex to the yarn, and 1.67 × 10 ⁻⁴ cN / dtex of the yarn was applied to the yarn for a 30-minute boiling water treatment and then 1.76 × 10 ^-3 cN / dtex was applied and the length A0 after standing for 30 minutes A0: After A1 measurement, the load was changed from 1.76 × 10 ⁻³ cN / dtex to 4.4 × 10 ⁻² cN / dtex Chief

  By setting the latent crimp rate to 30% or more, regardless of the combination with other materials or the selection of processing conditions, the woven or knitted fabric made of the composite fiber yarn can exhibit particularly excellent stretch performance. it can. Therefore, when the latent crimp rate is less than 30%, the woven or knitted fabric is difficult to obtain excellent stretch performance. On the other hand, when the actual crimp rate exceeds 50%, when the resulting woven or knitted fabric is composed only of the composite fiber yarn, the woven or knitted fabric is liable to have poor surface smoothness and to be prone to wrinkles. When the latent crimp rate is 35 ≦ C100 (%) ≦ 45, the woven or knitted fabric made of the obtained composite fiber yarn is more preferable because it has particularly excellent stretch properties and surface smoothness.

  The apparent crimp rate and the latent crimp rate are set appropriately depending on the copolymer component and intrinsic viscosity of the high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B), and the fineness of the composite fiber constituting the composite fiber yarn. It can be adjusted by making it.

  Next, an example is given and demonstrated about the manufacturing method of the latent crimpable polyester composite fiber yarn of this invention.

  The composite fiber yarn of the present invention can be produced by a normal composite melt spinning apparatus. First, on the back surface of the spinneret, the high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B) are merged into a side-by-side type or an eccentric core-sheath type, and a composite fiber is spun from the same spinneret. In this case, the spinning temperature is appropriately selected depending on the intrinsic viscosity of both polyesters, but is usually preferably in the range of 280 ° C to 310 ° C.

  The spun composite fiber is cooled and solidified, and then applied with a spinning oil agent to be converged into a composite fiber bundle, taken up at a speed of 1000 m to 4000 m / min, once taken up, and subjected to heat drawing by a drawing machine, Alternatively, the composite fiber yarn of the present invention can be obtained by continuously drawing the taken composite fiber bundle without taking it off.

  The draw ratio in the above production method is appropriately selected depending on the residual elongation of the composite fiber at the time of taking, and is preferably selected so that the residual elongation after drawing is in the range of 15 to 40%. If the residual elongation is higher than this range, sufficient crimping performance is not expressed, and if the residual elongation is lower than this range, there is a problem in operation such as cutting of the composite fiber during stretching, It is not preferable.

  And when using the composite fiber yarn of the present invention as a woven or knitted fabric, it can be used as warp or weft as it is, but it may be mixed with other yarns. Moreover, false twist processing may be given and false twist mixing fiber may be sufficient. Moreover, a real twist may be provided, a real twist mixed fiber, or a combination of these may be used.

  Since the latent crimp of the composite fiber yarn of the present invention develops the latent crimp by heat treatment, considering the workability such as process passability, the composite fiber yarn of the present invention is knitted or knitted. After making a woven or knitted fabric by the like, it is preferable to perform boiling water treatment to develop latent crimps. In particular, it is preferable to perform boiling water treatment in the dyeing step to develop it.

  Next, the woven or knitted fabric made of the latent crimpable polyester composite fiber yarn of the present invention (hereinafter sometimes abbreviated as the woven or knitted fabric of the present invention) will be described.

  The woven or knitted fabric of the present invention comprises the above-described composite fiber yarn of the present invention, has stretch properties superior to those of the prior art, and is excellent in surface smoothness and softness.

  In order to further enhance the effects of the invention, it is preferable that the mixed rate of the composite fiber yarn of the present invention in the woven or knitted fabric of the present invention is 40% by mass or more. In addition, according to the composite fiber yarn of the present invention, even when the woven or knitted fabric of the present invention is a woven or knitted fabric composed of only the composite fiber yarn, the woven or knitted fabric has good surface smoothness and has a wrinkle-prone defect. There is little outbreak.

  The structure of the woven or knitted fabric of the present invention is not particularly limited. The woven or knitted fabric of the present invention may be woven or knitted by a known method using the latent crimpable polyester composite fiber yarn of the present invention, and may be subjected to scouring, relaxation, dyeing or the like as necessary. For example, in any of the steps of scouring, relaxing, and dyeing, the latent crimps of the yarn can be manifested, and as a result, the knitted or knitted fabric can be provided with stretch performance.

  Hereinafter, the present invention will be described more specifically with reference to examples. In the examples, measurement and evaluation were performed as follows.

(1) Content of each component of high heat-shrinkable polyester (A) A chip made of high heat-shrinkable polyester (A) was mixed with deuterated hexafluoroisopropanol and deuterated chloroform at a volume ratio of 1/20. It was dissolved in a mixed solvent, 1H-NMR was measured with an LA-400 NMR apparatus manufactured by JEOL Ltd., and obtained from the integrated intensity of the proton peak of each copolymer component in the obtained chart.

(2) Intrinsic viscosity (V (A), V (B))
The polyester was dissolved in a 1: 1 mixed solvent of phenol and tetrachloroethane, and measured at 20 ° C. using an Ubbelohde viscometer.

(3) Measurement of glass transition point (Tg) and melting point (Tm) of high heat-shrinkable polyester (A) Using a differential scanning calorimeter SSC5200 manufactured by Seiko Denshi Kogyo Co., Ltd., it was measured at a heating rate of 10 ° C./min.

(4) Composite fiber fineness The value obtained by dividing the correct fineness of the composite fiber yarn measured by the JIS L 1013 positive fineness A method by the number of filaments was defined as the composite fiber fineness.

(5) Strong elongation Measured by JIS L 1013 tensile strength and elongation.

(6) Potential crimp rate and actual crimp rate Calculated by the method described above.

(7) Stretchability, surface smoothness (texture standing), and softness Using the obtained composite fiber yarn, weaving into a plain weave structure was performed and sensory evaluation was performed by 10 panelists. Each sample has a high stretchability, good surface smoothness (no wrinkles) and excellent softness, and was evaluated on a scale of 1 to 10 on a 10-point scale. 6 points or more were accepted).

Example 1
As the high heat-shrinkable polyester (A), ethylene terephthalate unit as a main component, and in the aforementioned chemical formula (1), BPAEO of m + n = 2 is 7 mol% with respect to the total polyhydric alcohol component, and NPG is with respect to the total polyhydric alcohol component. Intrinsic viscosity consisting essentially of PET as a low heat-shrinkable polyester (B) using a copolyester having an intrinsic viscosity of 0.74 containing 4 mol% (DEG content of all polyhydric alcohol components = 1.7 mol%). 0.64 polyester was used.

  The high heat-shrinkable polyester (A) and the low heat-shrinkable polyester (B) are supplied in equal amounts to a compound spinning melt extruder, melted at a spinning temperature of 295 ° C., and both polyesters on the back of a spinneret having 48 spinning holes. The composite fiber spun by splicing and joining to the side-by-side mold is cooled and solidified, and then the composite fiber is converged into a composite fiber bundle while applying an oil agent, and the surface speed is set to 3000 m / min via a take-up roller. I took it with a take-off machine. Next, the drawn composite fiber bundle is supplied to a drawing machine, and is drawn 1.60 times through a roller having a surface temperature of 85 ° C. and a hot plate having a temperature of 170 ° C., and is a 56 dtex / 48 filament latent crimpable polyester. A composite fiber yarn was obtained. The intrinsic viscosity, the Tg, and the Tm are measured using a high heat-shrinkable polyester (A) and a low heat-shrinkable polyester (B) chip, and the composite fiber fineness, the high elongation, and the apparent crimp. The measurement of the rate and the latent crimp rate was performed using samples sampled from the latent crimpable polyester composite fiber yarn.

  Weaving a plain weave fabric with warp density of 110 / 2.54 cm and weft density of 80 / 2.54 cm using the latently crimped polyester composite fiber yarn obtained as above for warp and weft, and scouring Thereafter, it was treated in boiling water at 100 ° C. for 30 minutes and then air-dried to obtain a woven fabric. About the obtained textile fabric, the said stretch property, surface smoothness (texture standing), and soft evaluation were performed.

Examples 2 and 3
A composite fiber yarn and fabric were prepared in the same manner as in Example 1 except that the BPAEO content in the high heat-shrinkable polyester (A) and the intrinsic viscosity of the high heat-shrinkable polyester (A) were changed as shown in Table 1. Obtained.

Example 4
In the same manner as in Example 1 except that the BPAEO and NPG contents in the high heat-shrinkable polyester (A) and the intrinsic viscosity of the high heat-shrinkable polyester (A) were changed as shown in Table 1, A woven fabric was obtained.

Example 5
A composite fiber yarn and woven fabric were obtained in the same manner as in Example 1 except that the intrinsic viscosity of the low heat-shrinkable polyester (B) was changed as shown in Table 1.

Example 6
A composite fiber yarn and woven fabric were obtained in the same manner as in Example 1 except that the composite shape of the composite fiber was changed to the eccentric core-sheath type instead of the side-by-side type.

Example 7
Among the constituents of the high heat-shrinkable polyester (A), a composite fiber yarn and woven fabric were prepared in the same manner as in Example 1 except that BPAEO, which is a compound obtained by adding 4 mol parts of ethylene oxide to 1 mol parts of bisphenol A, was used as BPAEO. Obtained.

Example 8
Among the components of the high heat-shrinkable polyester (A), the composite fiber yarn and the woven fabric were treated in the same manner as in Example 1 except that BPAEO, which is a compound obtained by adding 1 mol part of ethylene oxide to 1 mol part of bisphenol A, was used as BPAEO. Obtained.

Example 9
Among the components of the high heat-shrinkable polyester (A), a composite fiber yarn and woven fabric are produced in the same manner as in Example 1 except that BPAEO, which is a compound obtained by adding 3 mol parts of ethylene oxide to 1 mol parts of bisphenol A, is used as BPAEO. Got.

Comparative Example 1
Among the components of the high heat-shrinkable polyester (A), a composite fiber yarn and a woven fabric were obtained in the same manner as in Example 1 except that IPA was used instead of NPG.

Comparative Example 2
Of the components of the high heat-shrinkable polyester (A), the same procedure as in Example 1 was performed except that bisphenol A (hereinafter abbreviated as BPA) was used instead of BPAEO.

Comparative Examples 3 and 4
A composite fiber yarn and fabric were prepared in the same manner as in Example 1 except that the BPAEO content in the high heat-shrinkable polyester (A) and the intrinsic viscosity of the high heat-shrinkable polyester (A) were changed as shown in Table 1. Obtained.

Comparative Examples 5 and 6
A composite fiber yarn and fabric were prepared in the same manner as in Example 1 except that the NPG content in the high heat-shrinkable polyester (A) and the intrinsic viscosity of the high heat-shrinkable polyester (A) were changed as shown in Table 1. Obtained.

Comparative Example 7
The BPAEO content in the high heat-shrinkable polyester (A) and the intrinsic viscosity of the high heat-shrinkable polyester (A) were changed as shown in Table 1, and the composite shape of the composite fiber was changed to a side-by-side type and an eccentric core-sheath type. A composite fiber yarn and woven fabric were obtained in the same manner as in Example 1 except that.

Comparative Example 8
A composite fiber yarn and woven fabric were obtained in the same manner as in Example 1 except that the BPAEO and NPG contents in the high heat-shrinkable polyester (A) were changed as shown in Table 1.

  The evaluation results of the obtained fiber and woven fabric are shown together in Table 1.

  As is apparent from Table 1, in Examples 1 to 9, the high heat-shrinkable polyester resin (A) has a DEG content of less than 2 mol%, and any of the obtained composite fiber yarns has a desired manifested crimp. The fabric obtained was satisfactory in stretchability, surface smoothness and softness. Among them, the composite fiber yarns of Examples 1 and 3 to 6 use BPAEO, which is a compound in which 2 mol parts of ethylene oxide is added to 1 mol parts of bisphenol A as BPAEO, and the total content of the BPAEO and NPG (Ma + Mb) ) (Mol%) was in the range of 7 to 14 mol%, the resulting composite fiber yarn had a high Tg of the high heat-shrinkable polyester (A) and excellent thermal stability. The obtained woven fabric exhibited excellent softness and was particularly excellent in stretchability.

  On the other hand, since the composite fiber yarn of Comparative Example 1 uses IPA instead of NPG, the high heat-shrinkable polyester resin (A) has a DEG content of 2 mol% or more, and the resulting fabric is soft. It became inferior.

  Since the composite fiber yarn of Comparative Example 2 used BPA instead of BPAEO, the reactivity with terephthalic acid, which is a polybasic acid component, deteriorates in the polymerization step, and a high heat-shrinkable polyester (A) chip is obtained. I couldn't.

  Since the composite fiber yarn of Comparative Example 3 had a BPAEO content of more than 10 mol%, the resulting fabric had poor surface smoothness and poor softness.

  The composite fiber yarn of Comparative Example 4 had a BPAEO content of less than 4 mol%, and the total of the BPAEO content and the NPG content (Ma + Mb) was less than 7 mol%. Was inferior in stretchability and softness.

  Since the composite fiber yarn of Comparative Example 5 had an NPG content of less than 3 mol%, the resulting woven fabric was inferior in softness.

  Since the composite fiber yarn of Comparative Example 6 had an NPG content of more than 10 mol%, the composite fiber was excessively kneaded during spinning, and the composite fiber yarn could not be obtained.

  The composite fiber yarn of Comparative Example 7 had a BPAEO content exceeding 10 mol%, and the sum of the BPAEO content and the NPG content (Ma + Mb) exceeded 14 mol%. Thus, the obtained woven fabric was inferior in surface smoothness and softness, and the texture was conspicuous.

  The composite fiber yarn of Comparative Example 8 had a total content (Ma + Mb) of BPAEO content and NPG content (Ma + Mb) of more than 14 mol%. It was inferior, and the wrinkle standing was also conspicuous.

Claims (4)

Highly heat-shrinkable polyester (A) containing terephthalic acid as the polybasic acid component, ethylene glycol, ethylene oxide adduct of bisphenol A, neopentyl glycol and diethylene glycol as the polyhydric alcohol component, and mainly composed of polyethylene terephthalate or ethylene terephthalate unit A low heat-shrinkable polyester (B) made of polyester is a yarn formed by bundling latent crimpable polyester composite fibers joined in a side-by-side type or an eccentric core-sheath type,
The content (Ma (mol%)) of the ethylene oxide adduct of bisphenol A with respect to the total polyhydric alcohol component of the high heat-shrinkable polyester (A) satisfies the formula (I),
The neopentyl glycol content (Mb (mol%)) relative to the total polyhydric alcohol component of the high heat shrinkable polyester (A) satisfies the formula (II),
The content (Mc (mol%)) of the diethylene glycol with respect to the total polyhydric alcohol component of the high heat-shrinkable polyester (A) satisfies the formula (III),
The total content of the ethylene oxide adduct of bisphenol A and the content of neopentyl glycol (Ma + Mb) (mol%) satisfies the formula (IV),
A latent crimpable polyester composite fiber yarn, wherein the yarn has a three-dimensional spiral-like manifest crimp.
4 ≦ Ma (mol%) ≦ 10 (I)
3 ≦ Mb (mol%) ≦ 10 (II)
Mc (mol%) ≦ 2.0 (III)
7 ≦ Ma + Mb (mol%) ≦ 14 (IV)
Ma: Content of ethylene oxide adduct of bisphenol A (mol%)
Mb: Neopentyl glycol content (mol%)
Mc: Diethylene glycol content (mol%) The actual crimp rate (C0 (%)) and the latent crimp rate (C100 (%)) of the latent crimpable polyester composite fiber yarn satisfy the formulas (V) and (VI). The latent crimpable polyester composite fiber yarn according to 1.
0 <C0 (%) ≦ 18 (V)
30 ≦ C100 (%) ≦ 50 (VI)
C0 (%) = [(L0−L1) / L0] × 100
C100 (%) = [(A0−A1) / A0] × 100
L1: Knot length while applying a tension of 90.91 × 10 ⁻³ cN / dtex to the yarn, applying a load of 1.67 × 10 ⁻⁴ cN / dtex to the knot, and standing for 30 minutes L0: After the L1 measurement, the length A1: when the load is changed from 1.67 × 10 ⁻⁴ cN / dtex to 90.91 × 10 ⁻³ cN / dtex, the yarn has 90.91 × 10 ⁻³ cN / dtex. After removing the wrinkle while applying tension, the load of 1.67 × 10 ⁻⁴ cN / dtex was applied to the reed for 30 minutes, and then the load of 1.76 × 10 ⁻³ cN / dtex was applied and left for 30 minutes. Saddle length A0: Strain length when the load is changed from 1.76 × 10 ⁻³ cN / dtex to 4.4 × 10 ⁻² cN / dtex after A1 measurement The latent crimpable polyester composite fiber yarn according to claim 1 or 2, wherein the ethylene oxide adduct of bisphenol A is composed of a compound represented by the following chemical formula (1).
  A woven or knitted fabric comprising the latent crimpable polyester composite fiber yarn according to any one of claims 1 to 3.