KR100283792B1 - Highly elastic fiber balls containing heat-bonding conjugated fibers - Google Patents

Abstract

The high-elasticity heat-adhesive composite fiber capable of obtaining a fiber structure having excellent compression recovery durability and high breathability includes the thermoplastic elastomer component and the crystalline nonelastic polyester component having a higher melting point than that of the elastomer. A shape in which the elastomeric component is arranged in a crescent shape at the fiber cross-section of the circular adhesive composite fiber, and the geometric dimension at that time (each of the two components constituting the heat-adhesive composite fiber occupies at the fiber cross-section). ) Can be specified and provided.

Description

HIGH ELASTIC FIBER BALLS CONTAINING HEAT-BONDING CONJUGATED FIBERS}

The present invention relates to a heat-adhesive composite fiber, and more particularly, to a fiber structure having particularly low interlocking between fibers in the process after spinning, and also having excellent elasticity, compression recovery durability and high breathability. It relates to a highly elastic heat-adhesive composite fiber that can be imparted.

The term "deadlock" refers to a phenomenon in which fibers are physically and chemically bonded by fusion, adhesion, and adhesion. By fusion and compression of the fibers by this "adhesion phenomenon", adverse effects occur during the manufacturing and processing of the fibers.

As a composite fiber composed of a crystalline thermoplastic elastomer and a crystalline thermoplastic polyester, Japanese Laid-Open Patent Publication No. 60-1404 discloses a side-by-side type of inelastic polyester mainly composed of block polyester polyether and polybutylene terephthalate. Disclosed is a highly crimped composite fiber that can be suitably used for outer garments and underwear that have been spun into a side-by-side or eccentric core-sheath. .

Japanese Unexamined Patent Application Publication No. 3-185116 discloses a highly elastic, easy-to-card opening system, in which a non-elastic polyester composed of a polyester ether-based elastomer and a polyethylene terephthalate agent is spun in a side-by-side type or a sheath type. A heat-adhesive composite fiber is disclosed which can be used very suitably for producing a nonwoven fabric having a.

Japanese Laid-Open Patent Publication No. 3-220316 discloses a yarn and a heat-adhesive nonwoven fabric having improved card passing and spinning properties, in which a polyester-based elastomer is disposed in a super component and an inelastic polyester is disposed in a core component. Useful substantially concentric heart sheath type heat-adhesive composite fibers have been proposed.

Moreover, about the heat-adhesive composite fiber arrange | positioned at the fiber surface and the fiber structure obtained using the same, a thermoplastic elastomer is also published by Unexamined-Japanese-Patent No. WO 91/19032, Unexamined-Japanese-Patent No. 4-240219, 3-3,293, Japan JP-A 5-98516, JP-163654, JP-177065, JP-261184, JP-302255, JP-321033, JP-337258, JP-A 6-272111, JP -306708 and the like.

The cross-sections of the various heat-adhesive composite fibers disclosed in the above-mentioned prior art are literally side-by-side and eccentric, as shown in Figs. 2A to 2C. The area ratio of inelastic polyester is compounded in the range of 20/80-80/20.

By the way, in the composite fiber using an elastomer as one component, the above-mentioned interlocking phenomenon of the composite fibers inevitably occurs after the spinning process due to the property of the elastomer, causing many problems.

In this sense, there is no description and no suggestion for obtaining the composite fiber which has improved the adhesiveness, elasticity and crimp expression while all the above prior arts overcome the phenomenon of interlocking fibers. In Japanese Unexamined Patent Application Publication No. 5-302255, regardless of the presence or absence of the above-mentioned recognition, when long-fibers are obtained by complex spinning of polyester-based elastomers having different compositions into a deep sheath type, It has been proposed to dispose an elastomer having a large amount of polyether as a core component, and to perform a composite spinning by placing an elastomer having a low polyether component as an initial component with little interlocking but inferior elastic properties. However, this does not provide a practical level of deadlock prevention. In addition, the use of the composite fiber is a nonwoven fabric material useful for puff material, wick, supporter, stretch tape and the like.

On the contrary, with respect to the comprehensive performance of the conventional heat-bonded composite fibers shown in Figs. 2 (a) to (c), that is, the anti-adhesion performance, the interfacial adhesion strength between the elastomer / polyester polymer, and the inherent thermal adhesion and crimp elasticity, In consideration, it is as Table 1.

Composite fiber (a) Composite fiber (b) Composite fiber (c) Noodle 1) Water inertia during spinning Good Bad Bad 2) Cutting at the time of extension littleness plenty plenty 3) Pushing crimper Good Bad Bad Composite Fiber Characteristics 4) Deadlock prevention performance during radiation versus small versus 5) Adhesive strength between elastomer / polyester (polymer interface) platoon)* versus versus 6) Heat adhesion between fibers (without deadlocks) ** (Small) ** Small (Large) ** Small (Large) ** Small 7) Crimping elasticity small versus versus 8) Stereoscopic crimp expression performance versus none versus Open side, card castle 9) Opening process Bad Bad Bad 10) Card Cylinder Wrapped Bad Bad Bad 11) Card web nonuniform Bad Bad Bad 12) Card Nep Bad Bad Bad Fiber Structure Characteristics 13) Resilience after heat treatment Small (because of low adhesion) Small (large adhesion but large deadlock, no binder property) Small (large adhesion but high adhesion, unable to exhibit binder characteristics) 14) Hardness unevenness after heat treatment Large (high unevenness due to large web unevenness) Large (large nonuniformity due to large web nonuniformity) Large (large nonuniformity due to large web nonuniformity) 15) durability after heat treatment small small small

The evaluation of Table 1 is a relative evaluation based on the composite fiber (b). In the above table, '*)' represents a case of polyester-based elastomer, and '**)' represents a case of presuming that there is no deadlock temporarily.

In the above table, the composite fiber (c) is excellent in four of the five required characteristics (corresponding to 4) to 8) of the composite fiber, and at first glance, it looks like an ideal fiber. However, the fact that the anti-deadlock performance of this fiber is "small", i.e., bad, causes a fatal disadvantage in the industrial manufacturing process and in the quality of the obtained product.

That is, the composite fiber is first collected in the winder or the original tow as an unstretched yarn, but is not sufficiently cooled, and an interlocking of the elastomer occurs at the time when the short fibers are focused, but on the winder Even in the state of being wound up and stored, there is a problem in that the interlacing of the fibers progresses and the strings become rigid, or the sub-toes are firmly fixed and cannot be released from the winder.

Moreover, even when it collects in an original tow can, since it sticks hard in a string form, there exists a problem that a water pipe quantity falls remarkably and productivity falls significantly. Thus, the sub-toe interlaced in the string shape is very poor in the stretching process, often wound around single yarns or stretching rollers, and thus cannot be stably produced. Even if the heat-adhesive fiber can be produced, the fibers are grouped and interlocked, so that when used in combination with other matrix fibers as a fiber structure such as a nonwoven fabric, the fixing point effective for interlacing the fibers during heat treatment is effective. Since the number of formation of is small, the adhesiveness is remarkably low, the elasticity is low, and the fiber structure is easily destroyed by external force, and there is a problem that the durability is lost.

On the other hand, in the composite fiber (a), the anti-adhesion performance is doubled compared to the composite fiber (b) or (c), but has a problem that the original purpose of the thermal bonding function and crimp elasticity are remarkably inferior.

An object of the present invention is to indispensably occur during the production of a heat-adhesive composite fiber in which a crystalline thermoplastic elastomer is disposed as one component, thereby solving the deadlock phenomenon that impairs the handleability, process characteristics, and even the original heat adhesion performance of the fiber. The problem that has been left unsolved until now is the coexistence of interfacial adhesion strength between polymers, original adhesion performance, and crimp elasticity.

Further, another object of the present invention is to provide a cushioning material or a high elastic fiber ball having excellent air blowing characteristics, excellent bulk properties, soft touch, high elasticity and excellent compression recovery durability. It is to provide an adhesive composite fiber.

According to the researches of the present inventors, the object is to specify the desired composite fiber when the elastomer component is arranged in the crescent shape in the cross section of the heat-adhesive composite fiber, and then the geometric dimension at that time is specified as follows. It proved to be obtainable.

That is, in the present invention, the crystalline thermoplastic elastomer (E) and the crystalline nonelastic polyester (P) having a higher melting point than that of the elastomer (E) are E: P = 20:80 to 80:20 at the circular fiber cross section. In the composite fiber is arranged at an area ratio of

Requirements

The cross section and the surface of the said fiber are specified by the following requirements (1)-(5).

(1) The elastomer (E) is arranged in a crescent shape formed by two circular arcs having different curvature radii in a fiber cross section, and a curve r ₁ having a large curvature radius forms part of the outer circumference line;

(2) The polyester (P) is bonded to the elastomer along the curve (r ₂ ) with the smaller radius of curvature among the two curves forming the crescent shape in the fiber cross section, while the radius of curvature is larger. Curve (r ₁ ) must form part of the fiber surface in an arc shape so that the circumference (R) becomes the outer circumference in the range of 25 to 49%;

(However, the principal ratio R is defined by the following definition. In a circle whose radius is r ₁ in FIG. 1, it is expressed by the ratio of (L ₃ ) to the entire circumference L ₁ + L ₃ ). , The main ratio (R) is calculated by `` R = {(L ₃ ) / (L ₁ + L ₃ )} × 100 (%).

③ The curvature radius ratio (Cr), which is the ratio (r ₁ / r ₂ ) of the radius of curvature (r ₁ ) to the radius of curvature (r ₂ ), is more than 1 and in a range of 2 or less;

④ will circumferential ratio (C) of the curve of the radius of curvature (r ₂₎ is in the range of 1.1 ~ 2.5; And

(However, oblique ratio (C) is to be in accordance with the definitions described below. In FIG. 1, (the circumference of the circle and that the radial length and, (r ₁₎ of the circular arc (L ₂₎ to the r ₂₎ in the radial the circular arc (L ₂₎ between the display and by the ratio of the length (L) of a (between the P ₁ -P ₂₎ between contact points, the circumferential ratio (C) is by _{"C = (L 2) / (} L) " Is calculated.)

⑤ The wall thickness ratio of the said elastomer (E) and polyester (P) shall be in the range of 1.2-3;

(However, the wall thickness ratio D is defined by the following definition. In FIG. ₁ , a straight line passing through the center of the circle having a radius of (r ₁ ) and the center of the circle having a circular arc of (r ₂ ) as the radius. polyester length (L _P) and the elastomer (E) in length is indicated by the ratio of (L _E), the wall thickness ratio (D) of the components of the (P) components of the direction _{"D = (L P) / (} L _E ) 』.

1 is a schematic diagram showing a cross-section of the fiber of the heat-adhesive composite fiber of the present invention,

(A), (b) and (c) are schematic diagrams showing the fiber cross section of the conventional heat-adhesive composite fiber, respectively.

Figure 3 is a schematic diagram showing a longitudinal section of the composite spinning cap for producing a heat-adhesive composite fiber of the present invention.

The requirements of 1 to 5 required for achieving the above object of the present invention will be described in detail with reference to the drawings.

In FIG. 1, an example (circle here) of the cross section of the heat-adhesive composite fiber which solved the subject of this invention is disclosed.

In FIG. 1, (E) represents a crystalline thermoplastic elastomer and (P) represents a crystalline inelastic polyester. The characteristic feature here is that the cross section is arranged in a circle of curvature radius (r ₁ ), and the component (E) is arranged in a crescent shape formed by two circular arcs having different curvature radii (r ₁ ) and (r ₂ ). The outer circumferential line L ₁ is an arc of curvature radius r ₁ , and constitutes a part of the fiber cross section as it is, while the component (P) has a radius of curvature among two curves forming a crescent shape in the fiber cross section. a curve (r ₂₎ of the smaller Therefore, in the bonding with the elastomer. And, (P) ingredients also the outer peripheral line (L ₃₎ fiber cross-section juyul (R) in to form a part of the fiber surface, and (L ₃₎ at the time as indicated by "R = (L ₃₎ /" ( L ₁ ) + (L ₃ )} × 100 (%)] needs to be in the range of 25 to 49%, preferably 28 to 40%. When this (R) is lower than 25%, it is easy to fuse or crimp fibers when manufacturing a composite fiber, and it becomes easy to produce a manufacturing trouble by agglomeration. In addition, since the (E) component is soft, defects or scratches occur in the rotating garnet wires used for fiber opening, blending, and the like, resulting in poor permeability, making it difficult to obtain long-term production or obtaining a uniform blended bulk surface. Further, the bonded portion (L ₁₎ becomes large chakjeom is more open with the surrounding fibers so, is a fine network structure is unlikely to occur in elasticity. On the other hand, when this (R) exceeds 49%, the area covered by the heat-sealing component of a fiber surface will become small in terms of an adhesive function, and desired adhesion will become difficult to occur.

In such a cross section, the curvature radius ratio Cr which is the ratio "(r ₁ ) / (r ₂ )" of the curvature radius r ₁ and (r ₂ ) needs to be larger than one.

When the value of (Cr) is 1 or less, the interface between both the (E) component and the (P) component is easily peeled off, and once peeled off, the adhesion between the fibers is greatly reduced, or the three-dimensional crimp expression performance is deteriorated. It is not preferable because the expression becomes small. In addition, the crimp elastic modulus of the composite fiber is lowered, which is not preferable because of problems such as poor carding in the opening step, card cylinder curling bundle, card web nonuniformity generation, and nep generation.

On the other hand, when the value of (Cr) exceeds 2, the occupied area of the fiber cross section of the component (E) is too large, which is not preferable.

Next, in the composite form, (E) component and the (P) circumferential about the joint line is also (C) of the component, that is, in FIG. 1, about the circumference (L _2), point (P ₁₎ and the point ( P ₂₎ the ratio of a line segment (L) connecting it is necessary that the range of _{"C = (L 2) / (} L) " is 1.1 to 2.5, preferably 1.2 to 2.0.

When this (C) value is lower than 1.1, for example, in the conventional composite form as shown in FIG. 2 (a), the polymers are easily peeled off, the expression of the crimp decreases, or the crimp expression in the heat treatment decreases. In addition, it is difficult to form a plastic hot-bonding point in which the inelastic crimped short fibers are wound. On the other hand, when this (C) value exceeds 2.5, crimp will become large too much, crimp in heat processing will also occur easily at the extreme, and the volume of a fiber structure etc. will become small, or a "bumpy feeling" will arise, and it is unpreferable. Here, a "bumpy feeling" refers to an unpleasant touch when a small hard substance is present in the structure when the surface of the fiber structure is touched.

Finally, it is also very important to specify the wall thickness ratio (D) between the component (E) and the component (P). This (D) is `` D = (L _P ) / (when the maximum wall thickness of the component (E) of FIG. 1 is (L _E ) and the maximum wall thickness of the component (P) is (L _p ). L _E ) ”, and this value needs to be in the range of 1.2 to 3.0, preferably 1.5 to 2.9. When this (D) becomes lower than 1.2, it is unpreferable because crimp expression becomes small, crimp expression in heat processing is small, and it is difficult to make a fiber structure similarly, and it is difficult to fuse while inelastic inelastic crimped fiber. Moreover, when this (D) exceeds 3.0, crimp will become large too much, crimp in heat processing will also occur easily at the extreme, volume, etc. will become small, or a touch will be uneven and it is unpreferable.

In this invention, it is preferable that melting | fusing point of (P) component is 10-190 degreeC higher than melting | fusing point of (E) component. As a result, during thermal bonding of the composite fiber, only the component (E) is heat-treated at a temperature not lower than the melting point of the component (E) or lower than the melting point of the component (P) so that the component (P) retains its original fiber shape. By maintaining the adhesion point between the fibers, maintaining the adhesive strength at a high level, it is possible to improve the elasticity, durability.

Here, the component (P) is not particularly limited as long as it is polyester, but conventional polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate It is a polymer consisting of polypibarolactone or a copolymer ester thereof, but polybutylene terephthalate, which is hard to remain torsion, is preferable because the repeated distortion is such a use. In particular, in the case where the hard segment of the elastomer used for the fusion component of the composite fiber is polybutylene-based, there is no problem such as peeling. It is preferable that melting | fusing point of this (P) component exists in the range of 110-290 degreeC.

On the other hand, it is suitable that melting | fusing point of (E) component exists in 100-220 degreeC. If it is less than 110 degreeC, even if it spins so that it may satisfy | fill the requirements of said (1)-(5) of this invention, the interlocking of the fibers at the time of spinning may not be completely prevented. In addition, when the above-mentioned composite fiber is loaded with bales in multiple stages, for example, in a warehouse without a summer tone device, there is a possibility that the fibers may be interlaced. When it exceeds 220 degreeC, the upper limit capability of the stable process temperature of a heat processing machine is the maximum, and partial nonuniformity of adhesive force arises, and it becomes unfavorable because it causes hardness nonuniformity. As for melting | fusing point of the said component (E), 130-180 degreeC is a more preferable range from the point of anti-adhesion, heat treatment stability, etc.

As this (E) component, a polyurethane type elastomer or a crystalline polyester type elastomer is preferable in terms of spinning titration, physical properties, and the like.

As the polyurethane-based elastomer, a low-melting polyol having a molecular weight of about 500 to 6000, for example, dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyesteramide, and the like, an organic having a molecular weight of 500 or less Diisocyanates such as P, P-diphenylmethane diisocyanate, tricin diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, xylene diisocyanate, 2,6-diisocyanate methyl caproate, hexamethylene The polymer obtained by reaction with diisocyanate etc. and the chain extender of molecular weight 500 or less, for example, glycol, amino alcohol, or triol is mentioned. Among these polymers, particularly preferred are polytetramethylene glycol or poly-ε-caprolactone as polyols. As the organic diisocyanate, p, p'-diphenylmethane diisocyanate is very suitable. As the chain extender, p, p'-bishydroxyethoxybenzene and 1,4-butanediol are very suitable.

On the other hand, as the crystalline polyester elastomer, a polyether ester block copolymer formed by copolymerizing a thermoplastic polyester as a hard segment and a poly (alkylene oxide) glycol as a soft segment, more specifically terephthalic acid and isophthalic acid , Phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4'-dicarboxylic acid, diphenoxyethanedicarboxylic acid, 3-sul Aliphatic compounds such as aromatic dicarboxylic acids such as sodium poisphthalate, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanediic acid, and dimer acid At least one of dicarboxylic acids selected from dicarboxylic acids or ester-forming derivatives thereof and the like, 1,4-butanediol, diethylene glycol, trimethylene glycol, tetramethylene glycol, bentamethylene glycol, hex Aliphatic diols such as methylene glycol, neopentyl glycol, decamethylene glycol, or alicyclic diols such as 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecanedimethanol, or ester ester derivatives thereof Polyethylene glycol, poly (1,2-propylene oxide) glycol, poly (1,3-propylene oxide) glycol, poly (tetramethylene) of at least 1 sort (s) of diol components chosen from these etc., and an average molecular weight of about 300-5000. It is preferable that it is a terpolymer which consists of at least 1 sort (s) of poly (alkylene oxide) glycol, such as an oxide) glycol, a copolymer of ethylene oxide and a propylene oxide, and a copolymer of ethylene oxide and tetrahydrofran. Do.

However, in view of physical properties such as adhesiveness, heat resistance and strength with polyester composite components, polyether ester block copolymers having polybutylene terephthalate as a hard segment and polyoxytetramethylene glycol as a soft segment are particularly preferred. desirable. In this case, the polyester portion constituting the hard segment has a copolymerization ratio (expressed in mol% based on the total acid component) based on the total acid component of the copolymer. And the thing containing 0-50 mol% of isophthalic acid is used. Examples of acid components other than terephthalic acid and isophthalic acid are phthalic acid, adipic acid, sebacic acid, azelaic acid, dodecanoic acid, 2,6-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, and 1,4-cyclohexanedica. It is also preferably used in order to obtain a predetermined melting point such as carboxylic acid and to improve the quality of elasticity and durability. In particular, those containing 50 to 90 mol% of terephthalic acid and 10 to 35 mol% of isophthalic acid are more preferably used.

Moreover, it is preferable that the main component of the glycol component of the said polyester part is 1, 4- butanediol. In addition, the "main" said here means that 80 mol% or more of all the glycol components is 1, 4- butanediol, and other types of glycol components may be copolymerized within 20 mol% or less. Copolymer glycol components preferably used include ethylene glycol, trimethylene glycol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, 1,4-cyclohexanediol, and 1,4-cyclohexanedimethanol Etc. can be mentioned.

Moreover, the said polyether ester block copolymer contains 5-80 weight% of poly (alkylene oxide) glycol components with an average molecular weight of 300-5000. It is especially preferable to contain 30-70 weight% of glycol components in average molecular weight 800-4000. When the average molecular weight is less than 300, the blockability of the obtained block copolymer is lowered, resulting in insufficient elastic recovery performance. On the other hand, when the average molecular weight is higher than 5000, the copolymerizability of the poly (alkylene oxide) glycol component is lowered and elastic recovery is achieved. It is not preferable because the performance is insufficient.

When the copolymerization amount of the glycol component is less than 5% by weight, even if the composite fiber is heat-bonded to form a cushioning material or the like, it is not possible to obtain a good elastic property for the purpose of the present invention. When it exceeds weight%, it is not preferable because the mechanical properties, heat resistance and light resistance of the obtained block copolymer are lowered.

As poly (alkylene oxide) glycol which is preferably used, homopolymers of polyethylene glycol, poly (propylene oxide) glycol and poly (tetramethylene oxide) glycol are preferable. Alternatively, a random copolymer or a block copolymer in which two or more kinds of repeating carriers constituting the homopolymer are copolymerized in a random or block shape may be used, and a mixed polymer in which two or more kinds of the homopolymer or copolymer are mixed. You can also use Such a polyether ester block copolymer can be obtained using a well-known manufacturing method of copolyester.

In the production of the composite fiber of the present invention, the component (E) and the component (P) are usually spun after drying until the moisture content is 0.1% or less.

The method for producing the fiber by combining the crystalline thermoplastic elastomer and the inelastic polyester can be carried out by a known spinning device and method.

Referring to the drawings, for example, the composite fiber of the present invention can be obtained using a composite cap as shown in FIG. In addition, with respect to the composite cap of FIG. 3, the component (P) is flown in the molten state from the pin 3 provided in the upper plate 1, and the component (E) is flowed in the molten state between the upper plate 1 and the lower plate. The mixture is discharged from the nozzle 4 formed on the lower plate 2. When spinning, the composite fiber yarn which is cooled and solidified after discharging the polymer can be taken out by applying a spinning emulsion, or it can be drawn out by 2 to 5 times in succession.

The reason why the composite fiber having the fiber cross section shown in FIG. 1 is formed by using the spin cap shown in FIG. 3 can be explained by the difference in melting point between the component (P) and the component (E). .

That is, since the difference in melting point of both is directly related to the melt viscosity, under the same temperature, the component (P) has a high viscosity (ie, hard) and the component (E) has a low melt viscosity (ie, soft).

That is, the molten state (P) component which flowed out from the fin 3 is hardly influenced by the discharge pressure of the molten state (E) component, but flows in a vertical direction as it is, pushing out the surrounding (E) component, It is in contact with the lower plate 2. Moreover, it discharges finally from the nozzle 4 along the lower board 2, and the fiber cross section as shown in FIG. 1 is formed.

It is remarkably effective as an antiblocking measure to interpose non-crystalline polyester-polyether-based block copolymers as spinning oils between single fibers with respect to the yarns before or after the spinning.

At the same time, the stretchability of the composite fiber is improved, and when the fiber structure is passed through the card to form the fiber structure, the original fiber is soft and the card performance is significantly inferior, but the amorphous polyether ester block copolymer is 0.02 based on the fiber weight. By providing it in the range of -5% by weight, the fiber smoothness is increased, and the wet polymer at the time of thermal bonding is also improved, so that the adhesive strength is increased, and the elasticity and durability of the fiber structure are greatly improved.

When the imparting amount based on the fiber weight of this amorphous polyether ester block copolymer is less than 0.02% by weight, it is insufficient to obtain effects of anti-adhesion, improvement of card properties and improvement of adhesion. On the other hand, if the adhesion amount exceeds 5% by weight, even if the adhesion amount of the amorphous polyester polyether block copolymer is increased much more, effects such as anti-adhesion, improvement of card properties, improvement of thermal adhesion, etc. cannot be obtained. The adhesiveness of the fiber surface is increased, adhesive entanglement occurs in the carding machine, a uniform fiber structure cannot be obtained, and hardness unevenness is generated, which is not preferable.

This amorphous polyether ester block copolymer is terephthalate and / or isophthalic acid and / or metasodium sulfoisophthalic acid or lower alkyl esters, lower alkylene glycols and polyalkylene glycols and / or polyalkylenes thereof. Polyetherester block copolymer consisting of glycol monoether.

For example, terephthalic acid-alkylene glycol-polyalkylene glycol-terephthalic acid-isophthalic acid-alkylene glycol-polyalkylene glycol, terephthalic acid-alkylene glycol-polyalkylene glycol monoether-terephthalic acid-isophthalic acid-polyalkylene Glycol-polyalkylene glycol monoether, terephthalic acid-metasodium sulfoisophthalic acid-alkylene glycol-polyalkylene glycol-terephthalic acid-isophthalic acid-metasodium sulfoisophthalic acid-alkylene glycol-polyalkylene glycol The ratio of terephthalate units and isophthalate units or / and metasodium sulfoisophthalate units is preferably 100: 0 to 50:50 (molar ratio) to prevent adhesion during spinning focusing. Moreover, in order to improve the anti-adhesion performance of the composite fiber provided with the said block copolymer, the ratio of a terephthalate unit, an isophthalate unit, and / or a metasodium sulfoisophthalate unit is especially preferable at 90: 10-50: 50 (molar ratio). Do.

Moreover, in the said block copolymer, the ratio of a terephthalate unit, an isophthalate unit, and / or a metasodium sulfoisophthalate unit, and a polyalkylene glycol unit is usually 2: 1-1:51 (molar ratio), and spin concentrating. Considering the prevention of adhesion between the short fibers in the city and the improvement of the adhesive strength of the fibers, the ratio of 3: 1 to 8: 1 (molar ratio) is particularly preferable.

Here, the alkylene glycol used for the preparation of the amorphous block copolymer is an alkylene glycol having 2 to 10 carbon atoms such as ethylene glycol, propylene glycol, tetramethylene glycol, decamethylene glycol, and the like, and polyalkylene glycol is usually Polyethylene glycol, poly, other than average molecular weight 600-12,000, Preferably average molecular weight, 1,000-5,000 polyethyleneglycol, polyethyleneglycol polypropyleneglycol copolymer, polyethyleneglycol polytetramethyleneglycol copolymer, polypropyleneglycol, etc. Monomethyl ether, such as propylene glycol, monoethyl ether, monophenyl ether, etc. are preferable. However, the monoethers of polyethylene glycol are especially preferable from the viewpoint of improving the anti-adhesion of short fibers.

The average molecular weight of the amorphous block copolymer is also related to the molecular weight of the polyalkylene glycol used, but is usually 2,000 to 20,000, preferably 3,000 to 13,000. If the average molecular weight is less than 2,000, it is insufficient from the standpoint of improving the stretchability, preventing adhesion, and improving the thermal adhesive strength. If the average molecular weight exceeds 20,000, the stretchability and the thermal adhesive force are lowered, which is not preferable. The polyalkylene glycol used for controlling the molecular weight during polycondensation of the block copolymer is preferably one end group blocked such as monomethyl ether, monoethyl ether, monophenyl ether.

The amorphous block copolymer is dispersed using an alkali metal salt of polyoxyethylene alkyl phenyl ether phosphate, an alkali metal of polyoxyethylene alkyl phenyl ether sulfate, and / or surfactants such as ammonium salts and alkanolamine salts thereof. It is preferable that aggregation start temperature of an amorphous block copolymer dispersion liquid is 30-100 degreeC, More preferably, it is 60-90 degreeC. In addition, the amount of the amorphous block copolymer is preferably 0.02 to 5.0% by weight based on the weight of the composite fiber, particularly preferably 0.1 to 3.0% by weight.

The heat-adhesive composite fiber of the present invention preferably has a fineness in the range of 0.5 to 200 denier. If it is less than 0.5 denier, the adhesive strength is insufficient when heat-bonded as a fibrous structure, and sufficient elasticity and durability cannot be obtained. When it exceeds 200 denier, thread thread cooling such as fibers is insufficient, and thus, the cross-sectional shape is reduced. Even if it is specified, it becomes difficult to prevent the dead fibers from sticking together.

As a result, the adhesive performance of a fiber falls and elasticity and durability become small. Especially the range of 2-100 denier is preferable. Although the composite fiber of this invention may give a crimp of a machine crimp after a crimping | crimping | stretching after extending | stretching, it is preferable that the crimp number is 5-25 piece / inch, and the crimp degree is 5-30%. If the number of crimps is less than 5 / inch and the crimp is less than 5%, it is not preferable because the card web is cut at the time of carding or the volume of the obtained fibrous structure is significantly lowered. When the number of crimps exceeds 25 / inch and the crimping degree exceeds 30%, the passability of the carding machine becomes worse, the web is uneven and the nep bunches, which is not preferable. In particular, the range of the crimp number of 8-20 pieces / inch and a crimping degree of 6-18% is especially preferable. Moreover, it is preferable that the cut length of the short fiber at this time exists in the range of 10-100 mm, and it is especially preferable to exist in the range which is 15-95 mm.

Although the above-mentioned heat-adhesive composite fiber can be thermoformed to a nonwoven fabric or a sheet even if used alone, regardless of the shape of the long fiber or the short fiber, the most preferable one is a fiber having a non-elastic polyester crimped fiber as a matrix. The composite fiber may be dispersed and mixed in the form of crimped short fibers in the aggregate and thermoformed into a desired shape. This aspect is typically disclosed in the previously disclosed WO 91/19032 publication.

The inelastic polyester crimped short fibers that form a matrix may be any criterion as long as the crimp forms are inelastic polyester crimped short fibers having a spiral shape, an omega shape, or a part thereof. Moreover, inelastic polyester crimped short fiber is a normal polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1, 4- dimethylcyclohexane terephthalate, and poly pivalolactone Or a spiral cross-section in which the cross-section of the crimped short fibers composed of these copolymer esters to the blended body of the crimped short fibers, or the side-by-side type fiber cross-sections in which the degree of polymerization or copolymerization of two or more polymers in the polymer is changed asymmetrically It is a complex short island expressing crimp. Of course, in order to express crimp, it is also preferable to express spiral or omega crimp at the time of extending | stretching and relaxation heat processing by anisotropic cooling which strongly cools one side of a fiber at the time of spinning. The cross-sectional shape of these bile fibers may be any of circular, flat, mold release or hollow.

In order for this crimped short fiber to become a skeleton of a fibrous structure, the polyester-based crimped single fiber alone needs to be bulky and exhibit resilience. It is preferable that single bulk property (JIS L-1097) is 35 cm <3> / g or more and 120 cm <3> / g or less under the load of 0.5 g / cm <2>, 15 cm <3> / g or more and 60 cm <3> / g or less under the load of 10 g / cm <2>, More Preferably it is necessary to be 40 cm <3> / g or more and 100 cm <3> / g or less, 20 cm <3> / g or more and 50 cm <3> / g or less, respectively. When these bulk properties are low, the problem that the elasticity and compressive resilience of the obtained fiber shaping material are low becomes remarkable.

The crimped short fibers preferably have a fineness in the range of 1 to 100 denier, and more preferably 2 to 50 denier. When the fineness is smaller than 1 denier, bulkiness is not exhibited, and when air or the like enters the geodetic layer, it is compressed and does not penetrate uniformly well, resulting in deterioration of the cushioning properties and repulsive force of the obtained cushioning material. In addition, when it is larger than 100 denier, the fiber is difficult to bend and structured is difficult, so that the number of components of the obtained fiber structure is too small, and the touch becomes hard. Moreover, it is preferable that the cut length exists in the range of 10-100 mm, and it is especially preferable to exist in the range which is 15-95 mm.

The heat-adhesive composite fiber of the present invention is useful for obtaining high elastic fibrous spherical bodies. In this case, it is preferable that the mixing ratio of the heat-adhesive composite fiber of the present invention and the non-elastic polyester-based crimped short fiber to be a matrix is in the range of 5 to 49:95 to 5 by weight ratio (%). If the mixing ratio of the heat-adhesive composite fiber is too high, the number of heat-bonding points formed in the fibrous spherical body is too large, and the fibrous spherical body becomes too hard to be a material of the cushioning material. On the contrary, if the mixing ratio of the composite fiber is too low, the number of heat-bonding points formed in the fibrous spherical body is too small, resulting in poor morphological stability of the fibrous spherical body.

Moreover, it is preferable that the smoothing material is processed on the surface of the said inelastic polyester crimped short fiber, and the processing agent which is easy to slip is processed. Since the surface is slippery, fibrous spheroidization due to air turbulence is likely to be performed. Moreover, the obtained fibrous spherical body feels soft, and it becomes easy to obtain the feel of a feather and feather touch. Any of these treatment agents may be any material that can be slipped by drying or curing after imparting a drug. For example, the surface friction can be reduced by coating with a segmented polymer of polyethylene terephthalate and polyethylene oxide. In addition, as a leveling agent of the silicone resin, the treatment agent mainly containing silicone resins such as dimethylpolysiloxane, epoxy modified polysiloxane, amino acid modified polysiloxane, methylhydrodiene polysiloxane, and methoxy polysiloxane in an arbitrary step can greatly improve the smoothness. It is preferable to consider from a viewpoint. As for the adhesion amount of the said smoothing agent, 0.1-0.3 weight% is suitable normally. Of course, the addition of an antistatic agent to the silicone resin or the antistatic treatment after the silicone resin treatment is performed to prevent static electricity by friction with air when spheroidizing the fibers and hot air turbulence treatment during fusion treatment. Since it is often necessary, it may be appropriately added if desired.

Such smoothing treatment generally inhibits thermal adhesion between the heat-adhesive composite fiber and the inelastic polyester-based crimped short fiber. The heat-adhesive composite fiber specified in the present invention is composed of polyethylene terephthalate and polyethylene oxide. The polymer-coated short fibers, as well as the crimped short fibers imparted with silicone fibers, are relatively well fused, and formally fit inelastic polyester-based short fibers in a spiral shape, thereby improving the adhesive strength in appearance. Of course, this action is less common composite adhesive fibers.

In the present invention, the mixing ratio of the inelastic polyester short fibers is preferably 95 to 51%, more preferably 90 to 55%. If the mixing ratio is too high, the amount of the heat-bonded composite fiber decreases, so that the heat-bonding point decreases, so that the resilience is low.

Moreover, when this mixing rate is too low, there will be too many heat attachment points, a fibrous spherical body will become too hard, and there exists a problem to make it a material of a cushioning material. In addition, as will be described later, since the inelastic polyester-based crimped synthetic short fibers are crimped and formed hot-bonding points by heat treatment, the fibrous spherical bodies are densified, which is not preferable.

In the present invention, in the case where fibrous spheroidization is performed by mixing the heat-adhesive composite fiber and the inelastic polyester-based crimped multifiber of the present invention by the method described below, the surface of the fibrous spherical body may be made of inelastic short fibers or It is preferable that a lot of fluff of inelastic short fiber exists. The fluff of the short fibers contributes to the smoothness of the surface of the fibrous spherical body, and makes the air spherical performance of the fibrous spherical body and the sensation of the cushion after the fibrous spherical body blow the air very good.

In particular, when the deformation is large (in this case, the deformation is particularly large means that the deformation is 50% thick, for example, based on the thickness of the original intermediate surface). The smooth touch attributable to the slippage between the two sides and the softness and frictional force of the hot-fixing point formed by the elastomer are added, thereby making it possible to manufacture an intermediate surface having a good feel.

In addition, even if the above large deformation is repeated, the hot fixation point formed by the elastomer recovers the deformation, thereby maintaining elasticity and achieving good durability.

Regarding the method for producing an elastic fibrous spherical body, first, the non-elastic polyester crimped short fibers and the heat-adhesive composite short fibers of the present invention are blended so as to have a predetermined blending ratio, so that the garnet wires are uniformly mixed sufficiently. With card | card etc. in which the some roller extended to was arrange | positioned, carding and blending are fully performed, and a bulk mixed wool bundle is obtained.

Subsequently, air is introduced into the blended bundle in a blower, and a turbulent stirring treatment is performed for a predetermined time, while the single fibers are divided and opened, and they are retained in a vortex of air to spheroidize.

Here, the bulk horn fiber, in which the inelastic polyester crimped fiber and the heat-adhesive composite fiber are uniformly mixed and slid, receives air or mechanical force, and in particular, the crimping proceeds due to the characteristics of the composite short fiber. It is easy, and spheroids form quickly.

In addition, heat treatment is performed at a temperature not lower than the melting point of the low-melting thermoplastic elastomer of the composite fiber and below the melting point of the polymer constituting the polyester-based crimped short fibers, thereby forming heat-bonding points in the fibrous spherical body, thereby providing excellent elasticity and durability. A fibrous spherical body having a good feel can be obtained.

In addition, since the crimping rate proceeds even after the heat treatment, the spheroidization action is further effective.

As long as it is such a method to produce such an action and the fiber is easy to advance spheroidization, you may manufacture the high elastic spherical body of this invention using any method. In addition, as described above, the non-elastic polyester-based short fiber surface has smoothness and is easy to slip, so that it is more likely to be spherical. Of course, from the beginning of this spheroidizing treatment, a method of simultaneously advancing fibrous spheroidization, crimping and low melting point polymers to cause fusion, and then proceeding with the spheroidization at room temperature at the beginning of the spheroidization The hot air is blown at the time when the nucleus nucleus is started to cause crimp expression and fusion, or after it is completely envisioned, the crimp expression and the fusion treatment are performed with gentle hot wind.

In particular, the crimp expression of the inelastic polyester crimped short fibers is lower than the crimp expression of the composite fibers, and the inelastic polyester crimped fibers appear on the surface of the fibrous spherical body. The aspect in which the fiber has a smooth surface is preferable because the fibrous spherical body is completely smooth, air is easily blown in, and the touch of the blown cushion is smooth and good.

Example

Hereinafter, an Example is given and this invention is demonstrated in detail.

In addition, each value in the Example was measured by the following method.

Intrinsic viscosity

The value which melt | dissolved the sample in various concentration [c] (g / 100mL) in the orthochlorophenol solvent, and extrapolated [etasp (non-viscosity) / c] measured at 35 degreeC with the density | concentration 0 with respect to the dissolved solution. [Eta] was made into intrinsic viscosity.

Melting point

The melting peak temperature was calculated | required using the differential scanning calorimeter 1090 type | mold by DuPon Corporation, and measured at the temperature increase rate of 20 degree-C / min. In addition, when this melting peak cannot be measured clearly, using a trace melting apparatus (manufactured by Yanagimoto Manufacturing Co., Ltd.), a sample of about 3 g is sandwiched between two pieces of cover glass and lightly pressed with tweezers. It heated up at the temperature increase rate of 20 degree-C / min, and observed the thermal change of the polymer. At this time, the temperature (softening point) at which the polymer softened and started to flow was defined as the melting point.

Yarn water inertia at spinning

At the time of spinning, the yarn is once stored in a can, and then transported to the next creel process, where a large number of yarns are concentrated and supplied to a drawing machine, with a yarn water capacity of Comparative Example 2 being 100%. The yarn counts of different composite fibers were compared.

Stretching

While the yarn is being stretched once, the drawing machine is stopped and the number of single single yarns of the drawn tow in the second hot water bath is examined, and the number of single single yarns of Comparative Example 2 is set to 100, based on this, the number of single yarns of other composite fibers. Compared.

Push Type Crimper Exhaust

The tow after stretching was supplied to the push-type crimper, and after crimping, the discharge state of the tow from the crimper box was visually determined. The case where the tow was naturally discharged from the crimper box without problems was extremely good. The case where the tow was discharged from the crimper box without clogging the tow was not a problem in operation, but the discharge was a little irregular. The case where the tow was clogged and was not discharged from the crimper box was judged as defective.

Yarn stabilization performance

The deadlock of the yarn immediately after spinning was visually determined. When the fibers do not interweave at all, the anti-deadlock performance is extremely large, and when there is a small amount of this deadlock, the anti-deadlock performance is referred to. Was determined to be bad.

Interfacial Bonding Strength Between Elastomer / Polyester

50 thermally adhesive composite fibers of the manufactured product were randomly extracted, and the state of interfacial peeling between the elastomer / polyester of the fiber cross section was visually evaluated by an electron microscope. The case where five or more fibers which do not generate an interfacial peel was referred to as the interfacial adhesive strength, and the case where the thirty or more fibers which caused the interfacial peeling was referred to as small.

Heat adhesion between fibers

The heat-adhesive composite fiber and the hollow polyethylene terephthalate short fiber of 14 denier, 64 mm of fiber length, and 9 / inch crimp number obtained by the conventional method are mixed and mixed at a ratio of 30:70 by weight, and the card After the sliver was prepared and heat-treated with a hot air circulation dryer for 10 minutes at a temperature of 200 ° C., the sliver was cut to a length of 20 mm, and both ends of the cut were fixed to a tensile tester, and a speed of m / min was obtained. The stress at the time of cutting | disconnection was measured. The measured value at the time of using the composite fiber of the comparative example 2 was made into 100%, On the basis of this, the value compared with the case of the other composite fiber was shown.

Crimp modulus

The crimping elasticity modulus of the composite fiber was measured by JIS L1074, and the value of Comparative Example 2 was determined as 100%, and the value was compared with that of other composite fibers.

Three-dimensional crimp expression performance

The composite fibers were opened, placed in a card, webized, cut to 10 cm in length and width, and heat-treated in a free state for 10 minutes at a temperature of 140 ° C. with a hot air dryer, and the crimp number was measured according to JIS L1074.

Opening process

The composite fibers were separated and weighed by the uncoated section when the 100 g opener carding process was passed, and Comparative Example 2 was 100%, and based on this, the weights of the uncoated sections of the other composite fibers were compared.

Card cylinder entangling

When the composite fiber is placed in the carding machine, the supply of the fiber is stopped during the operation in a steady state, and the fiber weight when all the fibers are discharged from the carding machine from the time of supply stoppage is measured. The measured amount of the composite fiber of Comparative Example 2 was 100%, and based on this, the value compared with the other composite fibers was shown.

Card web non-uniform, yes

The composite fiber is passed through a carding machine, and the state of the web at the outlet of the carding machine is visually determined. The case where there was no web nonuniformity or nep was made extremely favorable, the case where few were made good, and many cases made defect.

Resilience and durability after heat treatment

The mixed fiber web in the measurement of the above-mentioned heat adhesion force between fibers is laminated, heat-treated with a thermocyclic dryer for 10 minutes at a temperature of 200 ° C. on a flat plate, and has a density of 0.035 g / cm 3 and a thickness of 5 cm adjusted to a flat plate. When a fibrous structure is prepared, it is compressed by 1 cm with a cylindrical rod having a flat bottom surface having a cross-sectional area of 20 cm 2, the stress (initial stress) is measured, and it is made to be repulsive, and the composite fiber of Comparative Example 2 is used. The measured value of was 100% and based on this, the value was compared with other composite fibers.

After this measurement, after compressing for 10 seconds at a load of 800 g / cm 2, the load was removed, and the operation of leaving for 5 seconds was repeated 360 times, and the compressive stress was measured again after 24 hours.

The ratio of the change in stress after repeated compression to the initial stress is regarded as the durability of the fibrous structure, and the value in the case of using the composite fiber of Comparative Example 2 is set to 100. Indicated.

Hardness unevenness after heat treatment

After the heat treatment described above, the surface of the fiber structure prepared at the time of measuring the resilience and durability was touched to evaluate the sensory hardness unevenness. The case where there was no nonuniformity in the surface hardness was made favorable, and the case where there were many nonuniformities was made into defect.

Example 1 and Comparative Examples 1-3

45% (% by weight) of polybutylene-based terephthalate was polymerized by polymerizing an acid component obtained by mixing terephthalic acid and isophthalic acid at 85/15 (mol%) with butylene glycol, and then 55% of polybutylene glycol (molecular weight 200) Weight%) to give a block copolymerized polyether polyester elastomer. The intrinsic viscosity of this thermoplastic elastomer was 1.3 and melting point 172 degreeC.

Using this thermoplastic elastomer and polybutylene terephthalate as shown in FIG. 3 so as to have an area ratio of 50/50, such as placing an elastomer in the crescent shape of FIG. To this end, 0.05% by weight of a uriryl phosphate potassium salt was applied to the fiber as a spinning oil, and spun to give a composite fiber of Example 1. As this comparative example, it is composited side by side in (a) so that it may become a fiber cross section as shown to (a)-(c) of FIG. 2, In (b), it arrange | positions so that an elastomer may become a supercomponent ( In c), the elastomer was disposed so as to be an eccentric sheath type supercomponent, and composite spun with a known cap, and these composite fibers were set as Comparative Examples 1, 2, and 3, respectively. These unstretched fibers were stretched in a two-stage hot water bath at 60 ° C., 90 ° C. and stretch ratios of 2.5 and 1.2 times, respectively, followed by the addition of lauryl phosphate potassium salt and mechanical crimping with a push crimper. After giving, it dried at the temperature of 60 degreeC and cut | disconnected to 64 mm.

The physical properties of the obtained fiber were 9 deniers in thickness and the adhesion rate of the oil agent was 0.2% by weight. The fiber section circumference of the composite fiber of Example 1 was 35%, the curvature radius ratio (Cr) was 1.2, the curvature ratio (C) was 0.73, and the thickness ratio (D) was 2.1. The table | surface of the composite fiber of the composite fiber, the carding and carding property, and the fiber structure characteristic of these composite fibers are put together in the table of Table 1, and are shown.

In terms of noodle making, in Comparative Examples 2 and 3, there were many deadlocks, so there were many yarn water inertia and stretched yarns, and the discharge from the crimper box was poor, but in Example 1, Comparative Example 1 and their characteristics were good.

Regarding the properties of the composite fibers, Comparative Examples 2 and 3 had a very low anti-deadening effect of yarns and produced a lot of interlacing fibers to form very coarse fibers. When the card slivers were heat-treated with matrix fibers, The number of components of the composite fiber is practically very small, and the adhesive strength as the fiber structure is low. On the other hand, in Comparative Example 1 and Example 1, there are few yarns, and since the composite fiber is dispersed uniformly inside the fiber structure, the adhesive strength is increased. Comparing Comparative Example 1 and Example 1, Example 1 showed a higher adhesive force and was good.

Regarding the crimp characteristics of the composite fiber, it is assumed that in Comparative Example 1, the polyester (P) component has a half-moon shape and a cross-sectional shape close to flat, but the crimp modulus is low. This adversely affects the carding performance in the opening step, as will be described later for the card property. For Comparative Examples 2, 3 and Example 1, almost the same crimp modulus is shown.

In Comparative Example 2, there is no stereoscopic crimp expression performance of the composite fiber. Comparative Examples 1 and 2 and Example 1 have crimp expression performance because of cross-sectional anisotropy, but in Comparative Example 3, the three-dimensional crimp expression performance is low due to the influence of the interlocking. However, in Comparative Example 1 and Example 1 has a low level of cross-linking and cross-sectional characteristics, it has a high level of three-dimensional crimp expression performance. Regarding the openness and the cardability, in Comparative Examples 2 and 3, since there are many interlacing fibers, it is difficult to open them, and a lot of winding of the carding machine into the cylinder occurs, and a lot of nonuniformity and nep of the web occur, which is not preferable. In the comparative example 1, since the crimp elastic modulus of the composite fiber is low, the fiber is bundled and difficult to open, and the card cylinder has many windings, and the card web has a lot of nonuniformity and nep, which is not preferable.

In Example 1, there were few interlaced fibers, the carding performance at the time of opening was good, the cylinder winding of the carding machine was small, the nonuniformity of the web, and also the nep were few.

Regarding the fiber structure characteristics, as described above in Comparative Examples 1, 2, and 3, the state of the card web was not good, the adhesive force was low, the repulsion was low, the hardness nonuniformity was large, and it was a problem in practical use.

In Example 1, since both the openness and the cardability were good, the adhesiveness during heat treatment was high, and more three-dimensional crimp was expressed at the same time, a good fiber structure was obtained with both good resilience and durability and less strength unevenness. .

Example 2

Except for changing the spinning oil and the stretching oil of Example 1 from the lauryl phosphate potassium salt to the dispersion of the polyester polyether block copolymer, the same procedure as in Example 1 was carried out to obtain a composite fiber, and various characteristics were evaluated. .

In this case, as the block copolymer, terephthalic acid / isophthalic acid / ethylene glycol / polyethylene glycol block copolymer (terephthalate unit: isophthalate unit = 70:30, terephthalate unit + isophthalate unit: polyethylene glycol unit = 5: 1, Polyethyleneglycol molecular weight = 2,000, average molecular weight of the block copolymer = 10,000) and 10% aqueous component aqueous solution of the active ingredient in which the surfactant POE (10 mol) nonylphenylethersulfate potassium salt was blended in the ratio of 80:20. .

The results are shown in Table 2.

In Example 1, although there existed a tendency for the deadlock at the time of radiation concentrating, the deadlock disappeared completely and the various more favorable characteristics were obtained.

Thus, by providing an amorphous polyether ester block copolymer to the composite fiber, the reason why the anti-adhesion effect is further improved is estimated as follows. That is, it is presumed that the block copolymer is dispersed as fine particles, interposed between the fibers before or during yarn concentration during spinning and acting as a roller to reduce the friction between the fibers. In addition, since the block copolymer is dispersed in water and dispersed in water, even when the composite fiber is heated to a high temperature at which stretch can be performed, no deadlock phenomenon is confirmed, and it is estimated that it contributes to the improvement of the stretchability. The results are collected in Table 2 and shown.

Examples 3-8

In Example 1, the same operation as in Example 1 was carried out except that the polymers had different discharge cross-sections and spinning cap specifications to produce heat-adhesive fibers having different fiber cross-sectional shapes as shown in the table in Table 3. Was evaluated.

As a result, in all cases of Examples 3 to 8, when the noodle-making property is explained, the yarns have little interlacing, the openness in the nonwoven fabric fastening, the card permeability are good, and the adhesive force between the fibers of the fiber structure obtained by thermoforming. A good fibrous structure with good resilience and durability and low hardness unevenness was obtained.

Comparative Examples 4 to 6

In Example 1, the same operation as in Example 1 was carried out except that the polymers had different discharge cross-sections and spin cap specifications to produce thermally adhesive fibers having different fiber cross-sectional shapes as shown in Table 4 below. Was evaluated.

As a result, in the case of Comparative Examples 4 to 6, when the noodle-making property was described, there were many yarn interlocking, and the carding performance and card passability in nonwoven fabric fixing were poor.

Moreover, when manufacturing a fiber structure, when the thermoforming process is performed, the adhesive force of fibers increases, the repulsion property and durability of the manufactured fiber structure are inadequate, and there is a problem with practical problems with hardness nonuniformity. It became a structure.

Example 9

Using the heat-adhesive composite fiber and the inelastic polyester crimped fiber used in Example 1, the composite fiber was blended with 30% of the spherical fiber and 70% of the crimped end fiber. Passed twice through the card to obtain a blended bulk cotton.

This bulk surface was put into a device having a blower connected to a duct and a bottom box, and stirred for 30 seconds by air flow in the blower to obtain a spheroidized surface. Thereafter, the spheroidized surface was transferred into the bottom box, and the elastic thermoplastic elastomer was melted while stirring the spherical surface with a weak air flow at a temperature of 195 ° C. to form a heat-bonding point in the spherical surface. Thereafter, air at room temperature was transferred into this bottom box and cooled to obtain a highly elastic fibrous spherical body.

As a result of observing this fibrous spherical body under a microscope, inelastic polyester-based crimped fibers were observed at a probability of 70% or more on the surface of the spherical body. In addition, when the air was blown into the cushion geodetic section using an air blower, it was satisfactory without any air blowing trouble, and the obtained cushion was also soft and resilient, having a retention rate of 80,000 compression hardness of 55%. It was much higher than 35% of the cotton which had been impregnated, and 32% of the cushioning material containing the surface of the polyethylene terephthalate and polyethylene oxide segments and polymer emulsion solidified.

The compressive hardness was 2.2 kg, which was higher than 0.6 kg or 0.9 kg of the solid and cotton of the silicone cotton and emulsion, and was 2.2 kg, with a soft touch and high resilience.

Comparative Example 7

In Example 9, instead of the elastic thermoplastic elastomer, terephthalate and isophthalic acid were mixed in a molar ratio of 60:40 in molar ratio based on the total acid component, ethylene glycol and diethylene glycol. Example 9 and except that a low melting polyester polymer (melting point 110 ℃, intrinsic viscosity 0.78) copolymerized with a glycol component mixed in a ratio of 85:15 in a molar ratio based on all diol components The same operation was carried out to obtain fibrous spherical bodies.

The fibrous globules obtained here were examined after 80,000 compression tests, and peeling breakage at the fixing point occurred severely. In addition, the retention rate of 80,000 times of compression hardness was 15%, which was very bad, had no elasticity, and had a very bad touch.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 2 Cotton 1) Yarn water inertia during spinning 2) Single yarn during drawing 3) Pushing crimper discharge %%- 20055 Good 21053 Good 100 100 10598 defective 2503 Extremely good Composite Fiber Characteristics 4) Yarn anti-sticking ability 5) Interfacial adhesion strength between elastomer / polyester 6) Thermal adhesion between fibers 7) Crimping elasticity 8) Three-dimensional crimping performance -%% pcs / inch Battalion Battalion Platoon 1001000 Platoon 1059612 Maximal Open Card 9) Opening process Openness 10) Card cylinder wrapped 11) Card web nonuniformity 12) Card web NEP %%- Good 5150 8684 Defective 100 100 defective 9799 defects Very good very good Fiber Structure Characteristics 13) Resilience after heat treatment 14) Hardness unevenness after heat treatment 15) Durability after heat treatment 82 small 120 49-106 100 to 100 93 to 105 110 Extreme 130

Each parameter of fiber cross section Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Area ratio (P: E) (%) 50:50 50:50 25:75 75:25 60:40 30:70 40:60 35:65 Circumference rate (%) 35 35 47 27 30 45 38 42 Cr (r1 / r2) ratio 1.3 1.25 1.1 1.9 1.5 1.2 1.25 1.23 C (12/1) ratio 1.73 1.73 2.3 1.2 1.5 2.1 2.2 2.15 Wall thickness ratio 2.1 2.1 2.9 1.2 1.8 2.7 2.5 2.6

Parameters of Fiber Section Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Area ratio (P: E) (%) 50:50 50:50 50:50 30:70 40:60 35:65 Circumferential rate (%) 50 side by side Zero depth type 5 Eccentric Heart Type 45 38 42 Cr (r1 / r2) ratio - 1.4 1.4 1.2 1.25 1.23 C (l2 / l) ratio One - - 2.1 2.2 2.15 Wall thickness ratio One 4.8 2.4 2.7 2.5 2.6

The heat-adhesive composite fiber of the present invention has a crystalline (E) component as one component, which is inevitably generated during the production of the composite fiber, which impairs the handleability, process characteristics, and even the original adhesion of the fiber. It is to achieve the existence of the interfacial adhesion strength between the polymer, the original adhesive performance and the crimp elasticity, and to solve various deadlocks, such as furniture, beds, pads, bedding, seat cushions, and kilt wear. It can be used suitably as an intermediate surface, nonwoven fabrics, such as a sanitary material and medical | medical_use, a cotton fabric for medical use, a carpet, and a vehicle interior material.

In addition, the fibrous spherical body using the heat-adhesive composite fiber of the present invention as a binder has excellent air blowing characteristics, so that an excellent cushioning material or pad has excellent bulk properties, high elasticity, soft touch, and excellent compression durability. It can be used very suitably as an intermediate surface padding body, such as ash and pillow.

Claims (11)

The crystalline thermoplastic elastomer (E) and the crystalline inelastic polyester (P) having a higher melting point than the elastomer (E) are arranged in an area ratio of E: P = 20: 80 to 80:20 at the circular fiber cross section. As the composite fiber, the fiber has 5 to 49 wt% of the heat-adhesive composite fiber whose cross section and surface is specified by the following requirements ① to ⑤ based on the total fiber weight, and the inelastic polyester crimped short fiber Is a fibrous spherical body composed of a group of intertwined short fibers, and is flexible to at least a part of a fiber confounding point between the heat-adhesive composite fibers or the heat-adhesive composite fibers and the inelastic polyester-based crimped end fibers A high elastic fibrous spherical body, characterized in that a hot fixing point is formed. Requirements (1) The elastomer (E) is arranged in a crescent shape formed by two circular arcs having different curvature radii in a fiber cross section, and a curve r ₁ having a large curvature radius forms part of the outer circumference line; (2) The polyester (P) is bonded to the elastomer along the curve (r ₂ ) with the smaller radius of curvature among the two curves forming the crescent shape in the fiber cross section, while the radius of curvature is larger. Curve (r ₁ ) must form part of the fiber surface in an arc shape so that the circumference (R) becomes the outer circumference in the range of 25 to 49%; (However, the principal ratio R is defined by the following definition. In a circle whose radius is r ₁ in FIG. 1, it is expressed by the ratio of (L ₃ ) to the entire circumference L ₁ + L ₃ ). , The main ratio (R) is calculated by `` R = {(L <sub>3</sub> ) / (L <sub>1</sub> + L <sub>3</sub> )} × 100 (%)] ③ The radius of curvature ratio (Cr), which is the ratio (r <sub>1</sub> / r <sub>2</sub> ) of the radius of curvature (r <sub>1</sub> ) to the radius of curvature (r <sub>2</sub> ), is more than 1 and in a range of 2 or less; ④ will circumferential ratio (C) of the curve of the radius of curvature (r <sub>2)</sub> is in the range of 1.1 ~ 2.5; (However, oblique ratio (C) is to be in accordance with the definitions described below. In FIG. 1, (the circumference of the circle and that the radial length and, (r <sub>1)</sub> of the circular arc (L <sub>2)</sub> to the r <sub>2)</sub> in the radial the circular arc (L <sub>2)</sub> between the display and by the ratio of the length (L) of a (between the P <sub>1</sub> -P <sub>2)</sub> between contact points, the circumferential ratio (C) is by <sub>"C = (L 2) / (</sub> L) " Is calculated); And ⑤ The wall thickness ratio of the said elastomer (E) and polyester (P) shall be in the range of 1.2-3; (However, the wall thickness ratio D is defined by the following definition. In FIG. <sub>1</sub> , a straight line passing through the center of the circle having a radius of (r <sub>1</sub> ) and the center of the circle having a circular arc of (r <sub>2</sub> ) as the radius. It is represented by the ratio of the length (L <sub>P</sub> ) of the polyester (P) component in the direction to the length (L <sub>E</sub> ) of the elastomer (E) component, and the wall thickness ratio (D) is `` D = (L _P ) / (L _E ) 』. The highly elastic fibrous spherical body according to claim 1, wherein a melting point of the elastomer (E) is in a range of 100 to 220 ° C. The highly elastic fibrous spherical body according to claim 1, wherein a melting point of the polyester (P) is 10 ° C or more higher than a melting point of the elastomer. 3. The elastomer (E) according to claim 2, wherein the elastomer (E) is a polyester-based elastomer, wherein the acid main component is 40-100 mol% terephthalic acid and 0-50 mol% isophthalic acid, and the glycol main component is 1,4-butanediol, and the soft The high elastic fibrous spherical body whose segment main component is a poly (alkylene oxide) glycol of the average molecular weight 400-5000, and whose intrinsic viscosity is 0.6-1.7 polyester in the range whose copolymerization amount is 5 to 80 weight%. The bulk property of the inelastic polyester crimped short fibers measured alone in accordance with the method of JIS L-1097 is 35 cm 3 / g to 120 cm 3 / g under a load of 0.5 g / cm 2. Highly elastic globular. The bulk properties of the inelastic polyester crimped short fibers measured alone according to the method of JIS L-1097 is 15 cm 3 / g to 60 cm 3 / g under a load of 10 g / cm 2. Highly elastic globular. The highly elastic spherical body of Claim 1 whose single yarn fineness of an inelastic polyester crimped short fiber is 1-100 denier. The highly elastic fibrous spherical body according to claim 1, wherein a smoothing agent is attached to the surface of the inelastic polyester-based crimped short fibers. 4. The high elastic fibrous spherical body according to claim 3, wherein the component (P) is polybutylene terephthalate. The highly elastic fibrous spherical body according to claim 1, wherein a part of the short fiber groups constituting the fibrous spherical body protrudes as a fluff on the surface of the spherical body. The highly elastic fibrous spherical body according to claim 10, wherein the ratio of the fluff protruding from the surface of the fibrous spherical body is larger in inelastic polyester-based crimped short fibers than the heat-adhesive composite fiber.