JP2001226831A - Hot-melt type conjugated fiber and structured fiber product composed thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-melt type conjugated fiber which can impart a structured fiber product having an excellent elasticity and excellent durability. SOLUTION: This conjugated fiber has a structure where a polyether-ester- based block copolymer elastomer(E) where a hard segment component is a polytrimethylene terephthalate-based polyester, a soft segment component is a polyalkylene oxide glycol having an average molecular weight of 400-5,000 and the copolymerized weight ratio of both components is (95:5) to (20:80) and a polyester(P) having the melting point not lower than the melting point of the elastomer plus 10 deg.C are placed in such a way that the area ratio of (E/P) in the cross section of the fiber is (20/80) to (80/20) and also at least part of the elastomer is exposed on the surface of the fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-adhesive conjugate fiber and a fibrous structure comprising the same. More specifically, the present invention relates to a heat-adhesive conjugate fiber having a polyester-based elastomer having a polytrimethylene terephthalate-based polyester as a hard segment and a heat-adhesive component, and a fibrous structure comprising the same and having excellent elasticity and durability. .

[0002]

2. Description of the Related Art Conventionally, polyester staple fibers, especially polyethylene terephthalate (hereinafter sometimes abbreviated as PET) staple fibers have been widely used as a filling material for bedding, furniture, clothing, and the like. Above all, a fiber structure obtained by mixing and heat-treating polyester short fibers and a heat-adhesive conjugate fiber using an elastomer as a low-melting component is used as a urethane substitute material, as a cushioning material, a mattress interlining, an automobile seat, It is used in a wide variety of areas such as bed mats. In addition, such a fibrous structure has a low humid sensation due to high air permeability, a good working environment because no solvent is required in the manufacturing process, and a harmful gas is generated from urethane materials when incinerated. There is an advantage that there is no waste, and because it is 100% polyester, it can be recycled.

[0003] The above-mentioned heat-adhesive conjugate fiber comprising a thermoplastic elastomer and polyester has been proposed in, for example, Japanese Patent Publication No. 60-1404, Japanese Patent Application Laid-Open No. 3-185116, Japanese Patent Application Laid-Open No. 3-220316, and the like. Have been. Further, a fibrous structure obtained by using a thermoadhesive conjugate fiber in which these thermoplastic elastomers are arranged on the fiber surface is also disclosed in International Patent Publication No. WO91 / 19032,
240219, JP-A-4-316629,
JP-A-5-98516, JP-A-5-163654
JP, JP-A-5-177065, JP-A-5-275
No. 61184, JP-A-5-302255, JP-A-5-32033, JP-A-5-337258
JP, JP-A-6-272111, JP-A-6-3
No. 06708, WO 97/23670
No. has been proposed.

[0004] The fiber structure proposed above is certainly improved in terms of elasticity, durability, feeling, etc. as compared with the conventional one. However, depending on the application, a fiber structure having higher durability is desired.

[0005]

SUMMARY OF THE INVENTION The present invention has been made on the background of the above-mentioned prior art, and an object of the present invention is to provide a fiber structure having good elasticity and excellent durability. An object of the present invention is to provide a heat-adhesive conjugate fiber and a fibrous structure comprising the same.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, combined a specific hard segment component and a soft segment component as a low melting point component of a heat-adhesive conjugate fiber. When a polyester-based elastomer was selected, it was found that not only the elasticity of the fiber structure using the fiber was good but also the durability was remarkably improved, and the present invention was completed.

That is, according to the present invention, a thermoplastic polyester-based elastomer (E) and a polyester (P) having a melting point higher than that of the elastomer by 10 ° C. or more in the cross section of the fiber are E: P = 20: 80- A polyester-based composite fiber having an area ratio of 80:20 and at least a part of the elastomer (E) is arranged to be exposed on the fiber surface, wherein the elastomer (E) has a hard segment component comprising Trimethylene terephthalate polyester is used, and the soft segment component has an average molecular weight of 400.
A polyetheralkylene oxide-based block copolymer having a poly (alkylene oxide) glycol of 5,000 to 5,000 and a copolymerization ratio (weight ratio) of a hard segment component and a soft segment component of 95: 5 to 20:80. A thermoadhesive conjugate fiber, and a thermoadhesive conjugate short fiber and a polyester staple fiber, wherein the weight ratio of the thermoadhesive conjugate staple fiber and the polyester staple fiber is 5: 95-70. : 30, wherein the heat-adhesive conjugate short fibers are a thermoplastic polyester-based elastomer (E) and a polyester (P) having a melting point higher than that of the elastomer by 10 ° C. or more. In E:
P: a polyester-based composite fiber having an area ratio of 20:80 to 80:20 and arranged such that at least a part of the elastomer (E) is exposed on the fiber surface, wherein the elastomer (E) is The hard segment component is a polytrimethylene terephthalate-based polyester, the soft segment component is a poly (alkylene oxide) glycol having an average molecular weight of 400 to 5,000, and the copolymerization ratio (weight ratio) of the hard segment component and the soft segment component is 95: 5-20: 80, which is a polyetherester-based block copolymer and has a contact point between the thermoadhesive conjugate staple fiber and the polyester staple fiber and / or a contact point between the thermoadhesive conjugate staple fibers. There is proposed a fibrous structure characterized in that at least a part thereof is formed with a heat fixing point.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoadhesive conjugate fiber of the present invention comprises a thermoplastic polyester-based elastomer (E) and a polyester (P) having a melting point higher than the elastomer by 10 ° C. or more.
And a polyester-based composite fiber comprising:

In the present invention, the thermoplastic polyester-based elastomer (E) has a hard segment component of a polytrimethylene terephthalate-based polyester,
A polyether ester system in which the soft segment component is poly (alkylene oxide) glycol having an average molecular weight of 400 to 5000, and the copolymerization ratio (weight ratio) of the hard segment component and the soft segment component is 95: 5 to 20:80. It is important that it is a block copolymer. By using a heat-adhesive conjugate fiber having a low melting point component as the combination of the hard segment component and the soft segment component and having the polyetherester-based block copolymer copolymerized in the above ratio as the low melting point component, the fiber structure Can be improved in elasticity, and the durability can be remarkably improved.

The above-mentioned polytrimethylene terephthalate-based polyester may contain a copolymer component such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2, 7
Aromatic dicarboxylic acids such as -dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, sodium 5-sulfoisophthalate, 1,4
An acid component such as an alicyclic dicarboxylic acid such as cyclohexanedicarboxylic acid, an aliphatic dicarboxylic acid such as succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanoic acid, or dimer acid; ethylene glycol, diethylene glycol, tetramethylene glycol, and pentane Examples thereof include aliphatic diols such as methylene glycol, hexamethylene glycol, neopentyl glycol, and decamethylene glycol, and diol components such as alicyclic diols such as 1,1-cyclohexanedimethanol and tricyclodecanedimethanol. Of these, isophthalic acid is preferably copolymerized at 15 mol% or less based on the acid component of the trimethylene terephthalate-based polyester.

The above-mentioned poly (alkylene oxide)
Examples of the glycol include polyethylene glycol, poly (1,2-polypyrene oxide) glycol,
Examples thereof include poly (trimethylene oxide) glycol, poly (tetramethylene oxide) glycol, a copolymer of ethylene oxide and propylene oxide, and a copolymer of ethylene oxide and tetrahydrofuran.

The thermoplastic polyester elastomer (E) has a melting point preferably in the range of 100 to 210 ° C., more preferably in the range of 130 to 180 ° C., and when the melting point is within this range, the thermal bonding In addition, the occurrence of fusion and pressure bonding of the fibers during the production of the conductive composite fiber is further suppressed, and the adhesion unevenness during the production of the fibrous structure is further suppressed. Furthermore, the intrinsic viscosity of the elastomer is preferably 0.6 to 1.7 from the viewpoint of spinnability and the like.

The polyester (P) which is another component constituting the heat-adhesive fiber of the present invention includes polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytrimethylene terephthalate, polycyclohexylene dimethylene terephthalate, Polypivalolactone, or any of these copolymers may be used, but from the viewpoint of elastic recovery of the obtained fiber structure, polytrimethylene terephthalate-based polyester, polybutylene terephthalate-based polyester, or poly Cyclohexylene dimethylene terephthalate polyester is preferred.

The polyester (P) needs to have a melting point higher than that of the elastomer (E) by 10 ° C. or more. However, as long as this requirement is satisfied, the polyester (P) in the above-mentioned polyetherester block copolymer can be used. Various copolymer components similar to the polyester constituting the hard segment component can be copolymerized.

In the heat-adhesive conjugate fiber of the present invention, the thermoplastic polyester-based elastomer (E) and the polyester (P) are E: P = 20: 80 in the fiber cross section.
It is necessary to be compounded so as to have an area ratio of ８０80: 20. At this time, in addition to the core-sheath type, the eccentric core-sheath type, parallel (side-by-side) type, sea-island type composite spun fiber or sea-island type mixed spun fiber, and tangerine tufted coordination (division) in addition to the core-sheath type Any of known composite states such as fibers may be used, but a part of the elastomer (E) is exposed on the fiber surface, and preferably 3% of its circumference in the fiber cross section.
It is necessary to arrange so that the elastomer accounts for 0% or more. Above all, in the case of the parallel type and the eccentric core-sheath type, since the latent crimping ability such that fine crimps become apparent at the time of heat treatment at the time of molding the fiber structure can be easily provided,
It is particularly preferable because the entanglement of the fibers increases and the adhesiveness can be improved.

The cross section of the fiber does not have to be a perfect circle, but may be a polygon, a fin, a dumpling, or the like. In this case, the shape is preferably a perfect circle. Further, it may have one or more hollow portions.

The single fiber fineness of the heat-adhesive conjugate fiber of the present invention is preferably in the range of 0.5 to 200 dtex, more preferably in the range of 2 to 100 dtex. By being within the above range, when the fiber structure is subjected to a heat bonding treatment, the number of heat fixing points formed in the fiber structure becomes appropriate, and sufficient strength is obtained. In addition, the sticking phenomenon in producing the heat-adhesive conjugate fiber can be extremely suppressed.

The heat-bondable conjugate fiber may be crimped as long as no problem occurs in the process, and the number of crimps is in the range of 8 to 20 ridges / 25 mm. The crimp ratio is preferably in the range of 6 to 18%.

When the conjugate fiber is cut into short fibers, the cut length is preferably in the range of 10 to 100 mm, particularly preferably in the range of 15 to 95 mm. In this range, the cardability and the adhesiveness of the fiber structure are particularly good.

In order to produce the heat-adhesive conjugate fiber of the present invention, a conventionally known spinning method can be used.

Next, the fiber structure of the present invention will be described. The fibrous structure of the present invention is a fibrous structure composed of the short fibers composed of the above-mentioned heat-adhesive conjugate fibers and the polyester-based short fibers.

Examples of the polyester short fibers include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexylene dimethylene terephthalate, polypivalolactone, and copolymers thereof. However, from the viewpoint of elastic recovery of the obtained fiber structure, polytrimethylene terephthalate-based polyester, or polycyclohexylene dimethylene terephthalate-based polyester is preferable, and particularly, polytrimethylene terephthalate-based polyester is preferable. . Here, the polytrimethylene terephthalate-based polyester and the polycyclohexylene dimethylene terephthalate-based polyester are respectively mainly a trimethylene terephthalate unit and a polyester composed of cyclohexylene dimethylene terephthalate unit,
Various copolymer components similar to the polyester constituting the hard segment component of the elastomer described above are preferably used.
The copolymerization may be 5% or less, more preferably 5% or less.

The polyester-based short fiber may be a crimped conjugate fiber comprising a polyethylene terephthalate-based polyester and a polyalkylene terephthalate other than the polyethylene terephthalate-based polyester.

The polyalkylene terephthalates other than the polyethylene terephthalate polyester which can be complexed with the polyethylene terephthalate polyester include polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, polycyclohexylene dimethylene terephthalate, Or a copolymer thereof, or any of a polyethylene terephthalate polyester having a different intrinsic viscosity from the polyethylene terephthalate polyester or a polyethylene terephthalate polyester having a different copolymerization component. ,
Polybutylene terephthalate-based polyester, polycyclohexylene dimethylene terephthalate-based polyester, and polyethylene terephthalate-based polyester having an intrinsic viscosity different from that of the polyethylene terephthalate-based polyester are particularly preferable in that the elasticity and durability of the fiber structure can be further improved. In addition, various copolymer components similar to the polyester constituting the hard segment component in the above-mentioned elastomer are preferably used in the polyester.
The copolymerization may be 5% or less, more preferably 5% or less.

In the same manner as described above, from the viewpoint that the elasticity and durability of the fibrous structure can be improved, the above-mentioned polyester-based short fibers include crimped composite short fibers obtained by compounding polytrimethylene terephthalate-based polyesters having different intrinsic viscosities. Fiber can also be preferably employed.

Examples of the above-mentioned conjugate fiber include side-by-side type, core-sheath type, and eccentric core-sheath type conjugate fiber. Among them, the side-by-side type, eccentric core-sheath type conjugate fiber forms a fiber structure. It is particularly preferable because latent heat crimping ability such that fine crimps become apparent by heat treatment at the time can be easily provided, and as a result, entanglement between fibers can be increased and adhesiveness can be improved.

The cross-sectional shape of the polyester staple fiber may be appropriately selected from circular, flat, triangular, hexagonal, hollow, etc. depending on the application.

The single fiber fineness of the polyester short fiber is as follows:
From the viewpoints of both bulkiness, cushioning property and resilience of the fibrous structure, and feeling, the range is preferably from 0.5 to 150 dtex, more preferably from 2 to 50 dtex. Further, from the viewpoint of bulkiness and cushioning property of the fibrous structure, the number of crimps of the polyester short fiber is preferably in the range of 3 to 30 ridges / 25 mm, more preferably 5 to 20 ridges / 25 mm. And the crimp ratio is preferably in the range of 6 to 50%, more preferably 12 to 40%.
Range. The cut length is preferably in the range of 10 to 100 mm, and particularly preferably in the range of 15 to 90 mm.

Further, various additives such as matting agents, heat stabilizers, defoaming agents, and tinting agents may be added to the polyester staple fibers within a range not to impair the object of the present invention, if necessary. ,
Flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, optical brighteners, coloring pigments and the like can be added.

In the production of the above-mentioned polyester staple fiber, a conventionally known method for producing and mixing a fiber composed of a single component or a composite fiber comprising two or more components can be used. In the case where the short fibers are not composed of conjugate fibers but are composed of only a single polyester, the method of performing anisotropic cooling during spinning is based on the relaxation heat treatment of the cotton-forming process and / or the fiber structure. It is preferably used because a heat treatment at the time of body forming allows the fiber to exhibit a helical or omega three-dimensional crimp to impart bulkiness to the fiber structure. At this time, the fiber is 5 to 4 in that crimp can be easily developed.
It is preferable to have a hollow cross section fiber having a hollow ratio of 0%.

The fibrous structure of the present invention comprises the above-mentioned heat-adhesive conjugate short fibers and polyester short fibers, and has at least one of the contact points of both short fibers and / or the contact points of the heat-adhesive conjugate short fibers. It is a fibrous structure in which a heat fixing point is formed in a portion.

The mixing ratio of both short fibers constituting the above-mentioned fibrous structure is in the range of 5:95 to 70:30, preferably 10:90, by weight in terms of heat-adhesive conjugate short fibers: polyester short fibers. ６０60: 40 is required. If the mixing ratio of the heat-adhesive conjugate fiber is too high, the number of heat fixation points formed in the fiber structure is too large and the structure is too hard.On the other hand, if it is too small, the number of heat fixation points decreases. Poor elasticity and durability of the structure.

[0033] The method for producing a fibrous structure is characterized in that at least a part of a contact point between the thermoadhesive conjugate short fiber and the polyester-based staple fiber and / or a contact point between the thermoadhesive conjugate short fibers is provided inside the fibrous structure. Any known method can be employed as long as it can form a heat-fixed point on the surface. For example, a method of performing blow molding into a specific mold followed by heat treatment can be preferably employed.

The heat treatment conditions for the above molding are as follows.
The temperature and time at which only the thermoplastic polyester-based elastomer (E) melts may be adopted. Specifically, the heat treatment temperature is preferably about 100 to 230 ° C., and the heat treatment time is preferably about 10 to 30 minutes.

[0035]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and the like, but the present invention is not limited to these examples. In addition, each value in an Example was calculated | required according to the following method.

1) Intrinsic viscosity: In the case of polyethylene terephthalate (PET) or polytrimethylene terephthalate (PTT) in an orthochlorophenol solution, 1.2.
g / deciliter, and in the case of polybutylene terephthalate (PBT), it was dissolved at 0.8 g / deciliter.

2) Fineness, fiber length, number of crimps, crimp rate: JI
It was measured by the method described in S-L1015.

3) Hardness (elasticity): JIS-K6401
It was measured by the method described in (5.4). 130-20
0N is good.

4) Repeated compression residual strain (durability): JIS
It was measured by the method described in -K6401 (5.6).
10% or less is good.

5) Hardness unevenness: Ten skilled workers were randomly selected, the surface of the fiber structure was touched by hand, and the hardness unevenness was subjected to a sensory evaluation based on the following criteria. 5: Very good (very uniform and no spots found) 4: Slightly good (almost no spots and mostly uniform) 3: Good (partially spotted but not bothersome) 2: Slightly poor (spots found 1: Extremely bad (obviously many spots)

Example 1 75 parts by weight of dimethyl terephthalate (TA), 25 parts by weight of dimethyl isophthalate (IA), 59 parts by weight of trimethylene glycol, 71 parts by weight of polytetramethylene glycol (PTMG; molecular weight 1500), catalyst Was charged into a reaction vessel equipped with a distillation apparatus, and
The transesterification reaction was carried out at 10 ° C, followed by 240 ° C
1% by weight of Sumitomo Chemical Sumilizer GA-80 as an antioxidant immediately before the end of the polycondensation reaction.
One part by weight of Sumitomo Chemical Sumilizer TP-D was added, and the mixture was melt-stirred and then formed into chips according to a conventional method to obtain a polyetherester block copolymer elastomer containing 40% by weight of a soft segment. The melting point of this thermoplastic elastomer was 155 ° C., and the intrinsic viscosity was 1.15.

The obtained thermoplastic elastomer is used as a sheath component,
Polybutylene terephthalate (PBT; intrinsic viscosity 0.8
5, melting point 232 ° C.) as the core component, and the fiber cross-sectional area ratio is core /
Spinning was performed at a discharge rate of 720 g / min using a well-known eccentric core-sheath composite fiber cap (260 holes) so that the sheath = 60/40, and the unstretched yarn was wound at 1100 m / min. Then, the obtained undrawn yarn was made into a 500,000 decitex tow, and then drawn 4.4 times by a two-stage hot water drawing method at 70 ° C × 90 ° C. The drawn yarn is crimped by a press-type crimping machine, heat-treated at 50 ° C., cut into a fiber length of 51 mm, and has a single fiber fineness of 6 dtex and a number of crimps of 12 peaks / 2.
A heat-bondable conjugate short fiber having a thickness of 5 mm and a crimp rate of 7% was obtained.

On the other hand, polyethylene terephthalate (PE)
T: 290 ° C. using intrinsic viscosity 0.64, melting point 256 ° C.)
And melted in a known hollow round section spinneret (150 holes)
To obtain an undrawn yarn at a winding speed of 1200 m / min by an anisotropic cooling method. Next, the obtained undrawn yarn was made into a 500,000 decitex tow, and then drawn 2.46 times by a two-stage hot water drawing method at 70 ° C. × 90 ° C. The drawn yarn is crimped by a press-type crimping machine, cut to a fiber length of 64 mm, subjected to a relaxation heat shrinkage treatment at 135 ° C., and treated with a polyethylene terephthalate short having a three-dimensional crimp and a single fiber fineness of 12 dtex. Fiber was obtained. The number of crimps of the obtained fiber,
Table 1 shows the crimp ratio.

The above-mentioned heat-adhesive conjugate short fibers and polyethylene terephthalate short fibers were mixed and passed twice through a roller card machine to obtain a mixed cotton web. This web is put into a mold so as to have a constant density, and is circulated by a hot air dryer of a circulation type.
Heat treatment at 0 ° C. × 15 minutes, density 0.04 g / cm
^3. A fiber structure having a thickness of 5 cm was obtained. Table 1 shows the results of evaluating the properties of the fiber structure.

[Examples 2 and 3, Comparative Examples 1 and 2] Cross-sectional area ratio of component E (sheath) / component P (core) in heat-adhesive conjugate fiber, or heat-adhesive conjugate short fiber in fiber structure A fibrous structure was obtained in the same manner as in Example 1, except that the mixing ratio of polyethylene terephthalate and short fibers was changed as shown in Table 1. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 4 Single fiber fineness having a three-dimensional crimp from polytrimethylene terephthalate (PTT; intrinsic viscosity 0.85, melting point 225 ° C.) under the same production conditions as for the polyethylene terephthalate short fiber of Example 1. Polydecimethylene terephthalate short fibers of 12 dtex were obtained. Table 1 shows the number of crimps and the percentage of crimp of the short fibers. A fiber structure was obtained in the same manner as in Example 1, except that the above-mentioned polytrimethylene terephthalate short fibers were used instead of polyethylene terephthalate short fibers. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 5 The thermoplastic elastomer obtained in Example 1 was used as a sheath component, and polytrimethylene terephthalate (PTT; intrinsic viscosity: 0.64, melting point: 256 ° C.) was used as a core component. The spinning was performed at a discharge rate of 720 g / min using a well-known eccentric core-sheath conjugate fiber die (260 holes) so that the ratio of / sheath was 60/40, and the unstretched yarn was wound at 1100 m / min. Then, the obtained undrawn yarn is
After making the tow to 100,000 decitex, 70 ° C x 90 ° C
The film was stretched 4.4 times by a stepped hot water stretching method. The drawn yarn is crimped by a press-type crimping machine, subjected to a relaxation heat shrinkage treatment at 50 ° C., and then cut into a fiber length of 51 mm to obtain a heat-adhesive conjugate short fiber having a single fiber fineness of 6 dtex. Was. Table 1 shows the number of crimps and the crimp ratio of the obtained fiber. In Example 1, the above-mentioned heat-adhesive conjugate short fibers containing polytrimethylene terephthalate as the core component (P) were used instead of the heat-adhesive conjugate short fibers containing polybutylene terephthalate as the core component (P), and A fibrous structure was obtained in the same manner as in Example 1, except that the polytrimethylene terephthalate short fibers obtained in Example 4 were used instead of the polyethylene terephthalate short fibers. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 6 Polyethylene terephthalate (PET; intrinsic viscosity 0.64, melting point 256 ° C.) and polytrimethylene terephthalate (PTT; intrinsic viscosity 0.8)
5, melting point of 225 ° C.) using a known side-by-side type composite fiber cap (260 holes) at a discharge rate of 1: 1, at a discharge rate of 720 g / min, and wound at 800 m / min to obtain an undrawn yarn. . Then, the obtained undrawn yarn was made into a 500,000 decitex tow, and then drawn 2.8 times by a two-stage hot water drawing method at 70 ° C × 90 ° C. The drawn yarn is crimped by a press-type crimping machine, subjected to a relaxation heat shrinkage treatment at 120 ° C., and then cut into a fiber length of 64 mm, and a composite fiber having a three-dimensional crimped single fiber fineness of 10 decitex. Fiber was obtained.
Table 1 shows the number of crimps and the crimp ratio of the obtained short fibers. In Example 1, a fibrous structure was obtained in the same manner as in Example 1, except that the above conjugate short fibers were used instead of the polyethylene terephthalate short fibers. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 7 Polytrimethylene terephthalate (PTT; intrinsic viscosity 0.85, melting point 225 ° C.) and polybutylene terephthalate (PBT; intrinsic viscosity 0.8
5, melting point: 232 ° C.) to obtain a conjugate short fiber in the same manner as in Example 6. Table 1 shows the number of crimps and the crimp ratio of the obtained short fibers. In Example 1, a fibrous structure was obtained in the same manner as in Example 1, except that the above conjugate short fibers were used instead of the polyethylene terephthalate short fibers. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 8 A composite short film was prepared from polyethylene terephthalate (PET; intrinsic viscosity 0.64, melting point 256 ° C.) and polyethylene terephthalate (PET; intrinsic viscosity 0.46, melting point 255 ° C.) in the same manner as in Example 6. Fiber was obtained. Table 1 shows the number of crimps and the crimp ratio of the obtained short fibers.
Example 1 was repeated except that the above-mentioned conjugate short fibers were used instead of polyethylene terephthalate short fibers.
In the same manner as in the above, a fiber structure was obtained. Table 1 shows the results of evaluating the properties of the fiber structure.

Example 9 Polytrimethylene terephthalate (PTT; intrinsic viscosity 0.85, melting point 225 ° C.) and polytrimethylene terephthalate (PTT;
66, melting point 222 ° C.) to obtain a conjugate short fiber in the same manner as in Example 6. Table 1 shows the number of crimps and the crimp ratio of the obtained short fibers.
Shown in In Example 1, except that the above-mentioned conjugate short fiber was used instead of polyethylene terephthalate short fiber,
A fibrous structure was obtained in the same manner as in Example 1. Table 1 shows the results of evaluating the properties of the fiber structure.

Comparative Example 3 75 parts by weight of dimethyl terephthalate (TA), 25 parts by weight of dimethyl isophthalate (IA), 59 parts by weight of tetramethylene glycol, polytetramethylene glycol (PTMG; molecular weight 1500) 71
Parts by weight and 0.2 parts by weight of tetrabutoxytitanate as a catalyst were charged into a reaction vessel equipped with a distillation apparatus, and subjected to a transesterification reaction at 210 ° C. according to a conventional method.
The polycondensation reaction was carried out at 1 ° C., and 1 part by weight of Sumitomo Chemical Sumilizer GA-80 and 1 part by weight of Sumitomo Chemical Sumilizer TP-D were added as antioxidants immediately before the completion of the polycondensation reaction. To obtain a polyetherester block copolymer elastomer containing 40% by weight of a soft segment. The melting point of this thermoplastic elastomer was 152 ° C. and the intrinsic viscosity was 1.14. A fiber structure was obtained in the same manner as in Example 1, except that the sheath component of the heat-adhesive fiber was changed to the above-mentioned elastomer to obtain a heat-adhesive fiber. Table 1 shows the results of evaluating the properties of the fiber structure.

[0053]

[Table 1]

[0054]

According to the fibrous structure obtained from the heat-adhesive conjugate fiber of the present invention, the heat-adhesive component of the fiber comprises a polytrimethylene terephthalate-based polyester as a hard segment component and a polyalkylene glycol as a soft segment component. Because of the combined elastomer, it has high elasticity and remarkably improved durability against repeated stress. For this reason, such a fiber structure can be suitably used for bedding, furniture, vehicle materials (cushion materials, ceiling materials, protective materials), clothing, filter materials, construction / civil engineering materials, agricultural materials, sanitary materials, and the like. .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryoji Tsukamoto 77, Kitayoshida-cho, Matsuyama-shi, Ehime Prefecture Teijin Limited Matsuyama Office (72) Inventor Kenji Baba 3-4-1 Amihara, Ibaraki-shi, Osaka Teijin Shares F-term in the Osaka Research Center (reference) 4L041 AA07 AA20 BA02 BA05 BA22 BA49 BA59 BC04 BD03 BD11 BD20 CA06 CA08 CA16 DD01 DD04 DD05 DD15 4L047 AA21 AA27 AB02 BA09 BB06 CC01 CC06

Claims (6)

[Claims] 1. A thermoplastic polyester-based elastomer (E) and a polyester (P) having a melting point higher than that of the elastomer by 10 ° C. or more are obtained by mixing E: P =
A polyester-based composite fiber having an area ratio of 20:80 to 80:20 and at least a part of the elastomer (E) is arranged to be exposed on the fiber surface, wherein the elastomer (E) is hard The segment component is a polytrimethylene terephthalate-based polyester, the soft segment component is a poly (alkylene oxide) glycol having an average molecular weight of 400 to 5,000, and the copolymerization ratio (weight ratio) of the hard segment component and the soft segment component is 95: A heat-adhesive conjugate fiber, which is a polyetherester-based block copolymer of 5 to 20:80. 2. A fibrous structure comprising a thermoadhesive conjugate short fiber and a polyester staple fiber, wherein the thermoadhesive conjugate staple fiber and the polyester staple fiber are in a weight ratio of 5:95 to 70:30. Wherein the heat-adhesive conjugate short fiber comprises a thermoplastic polyester-based elastomer (E) and a polyester (P) having a melting point higher by 10 ° C. or more than the elastomer.
A polyester-based composite fiber having an area ratio of E: P = 20: 80 to 80:20 in a fiber cross section and at least a part of the elastomer (E) is exposed on a fiber surface, In the elastomer (E), the hard segment component is a polytrimethylene terephthalate-based polyester and the soft segment component has an average molecular weight of 4
A poly (alkylene oxide) glycol having a weight ratio of from 95 to 5 to 20:80, and a poly (alkylene oxide) glycol having a weight ratio of 95: 5 to 20:80. A fiber structure, wherein a heat-fixed point is formed at at least a part of a contact point between the heat-adhesive conjugate short fiber and the polyester-based short fiber and / or a contact point between the heat-adhesive conjugate short fibers. body. 3. The fiber structure according to claim 2, wherein the polyester staple fiber is a crimped staple fiber composed of polytrimethylene terephthalate polyester or polycyclohexylene dimethylene terephthalate polyester. 4. The crimped conjugate short fiber comprising a polyester staple fiber comprising a polyethylene terephthalate polyester and a polyalkylene terephthalate different from the polyethylene terephthalate polyester.
The fiber structure according to any one of the preceding claims. 5. The polyalkylene terephthalate is any one of a polytrimethylene terephthalate-based polyester, a polybutylene terephthalate-based polyester, a polycyclohexylene dimethylene terephthalate-based polyester, and a polyethylene terephthalate-based polyester having an intrinsic viscosity different from that of one of the polyethylene terephthalate-based polyesters. The fibrous structure according to claim 4, wherein 6. The fiber structure according to claim 2, wherein the polyester-based short fibers are crimped conjugate short fibers obtained by compounding polytrimethylene terephthalate-based polyesters having different intrinsic viscosities.