JP2003052493A - Fiber cushion material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion material which has soft hand and high elasticity and has high thermal permanent set resistance particularly to the applications for vehicles or the like having many chances of exposing the material to a high temperature. SOLUTION: This fiber cushion material is formed by bonding together two kinds of polymers to a side-by-side type along the longitudinal direction of fibers and using conjugate fibers, at least one of which is polyester composed mainly of polytrimethylene teraphthalate in at least portions thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber cushion material which is rich in soft texture and elasticity, and has particularly good high heat settling resistance for applications in which it is frequently exposed to high temperatures. Due to its characteristics, the present invention relates to a fiber cushion material suitable for vehicle applications such as vehicle seats and vehicle ceiling materials.

[0002]

2. Description of the Related Art Polyurethane foam has been mainly used as a cushion material until now, but it has a problem in that it cannot be recycled and has poor breathability and comfort. In recent years, a fiber cushion material mainly composed of polyester fiber has been proposed. Has been done.

For the fiber cushion material, there is known a method in which a base material fiber and a heat-bonding fiber are mixed and once opened by a card machine, and then the base material fiber is heat-bonded by a heat treatment machine. In this method, the ordinary fiber cushion material was inferior to urethane foam in terms of softness, elasticity and the like.

Further, as compared with urethane foam, the fiber cushion material has a drawback that its high heat settling resistance under conditions of 70 ° C., which is said to indicate the temperature inside a car left in the hot sun in the midsummer, is extremely inferior. Have

As a general fiber cushion material, a cushion material in which polyester fibers are melt-bonded has been developed (JP-A-57-101018 and JP-A-58).
-31150 gazette), but these cushion materials are
40 because it uses a low melting point adhesive component as an adhesive
Due to severe plastic deformation in an atmosphere of ℃ or higher, 70
It is extremely inferior in high heat settling resistance under conditions such as ° C and is generally unusable for vehicles.

Further, various approaches have been taken from both sides of the base material fiber and the heat-bonding fiber for the purpose of improving the high heat fatigue resistance of the vehicle cushion material.

From the surface of the matrix fiber, Japanese Patent Application Laid-Open No. 6-1658
No. 84 and Japanese Patent Laid-Open No. 7-54253, a polyester cotton having a glass transition temperature of 80 ° C. or higher and a melting point of 150 ° C. or higher joined by a copolyester thermal adhesive fiber having a melting point of 80 ° C. or higher is used. It is disclosed. Regarding these fibers, although improvement in high heat settling resistance under conditions such as 70 ° C. is recognized, the fibers obtained by an ordinary spinning / drawing process have a high Young's modulus, and a cushion material was produced from the fibers. In this case, it cannot be a cushion material with a soft texture and elasticity like urethane foam.

From the aspect of the heat-bonding fiber, for example, Japanese Patent Laid-Open No.
Japanese Patent Application Laid-Open No. 247724, Japanese Patent Application Laid-Open No. 5-247819, and the like have proposed a heat-bonding fiber and a cushioning material in which a polyester elastomer is used in a sheath part of a heat-bonding component having a core-sheath structure. Is not taken into consideration, there is a drawback that the adhesive portion deteriorates and durability deteriorates when exposed to a relatively high temperature atmosphere for a long time.

In Japanese Unexamined Patent Publication No. 6-200461, etc., a polyester elastomer having improved heat resistance is used as the sheath of the heat-bonded fiber, and a thermoplastic polymer having a glass transition temperature of 65 ° C. or higher is used as the matrix fiber. Although a heat resistant fiber structure has been proposed, the glass transition temperature of the polyester elastomer itself is still low, and it cannot be said that the high heat sag resistance is sufficient.

Further, the applicants of the present invention have disclosed that Japanese Patent Laid-Open No. 2000-
Japanese Patent No. 129537 proposes a cushioning material having improved high thermal fatigue resistance by specifying the relationship between the glass transition temperature and the melting point of the heat-bonded fiber.

However, the above-mentioned heat-bonded fibers having a high glass transition temperature tend to have a high melting point, and in order to improve the heat-bonding strength and raise the hardness of the cushion material, a high-temperature heat treatment machine is indispensable. there were.

According to various studies conducted by the present inventors, in order to produce a cushioning material having improved high thermal fatigue resistance,
It was found that by making it possible to form a cushioning material in which the mixing ratio of heat-bonded fibers is drastically reduced, it is possible to satisfy not only soft texture and elasticity but also high heat settling resistance. In addition to the matrix fiber of the present invention, by setting the relationship with the mixing ratio of the heat-bonding fiber within a specific range, it becomes possible to improve the 70 ° C sag resistance of the cushion material to a higher level.

As described above, in the prior art, even if the base material fibers and the cushioning material used in a normal atmosphere are obtained, they are excellent in soft texture and elasticity especially in the field of cushioning material for vehicles exposed to high temperature. However, it has not been possible to provide a cushioning material having further high heat sag resistance.

[0014]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cushioning material which has a soft texture and elasticity, and which has a high thermal fatigue resistance, which cannot be achieved by the above-mentioned prior art.

[0015]

[Means for Solving the Problems] Two kinds of polymers are bonded side by side along the fiber length direction,
This can be achieved by a fiber cushion material characterized in that at least a part of the composite fibers is at least one of which is polyester mainly composed of polytrimethylene terephthalate.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.

The fiber cushion material used in the present invention is typically obtained by a method in which base material fibers and thermal bonding fibers are mixed and once opened with a card machine, and then the base material fibers are heat bonded with a heat treatment machine. What is said.

In the present invention, two kinds of polymers are laminated side by side along the fiber length direction, and at least one of them is polytrimethylene terephthalate (hereinafter,
It is necessary to mold the cushion material by using at least a part of the composite fiber which is a polyester mainly composed of PTT).

The number of composite fibers used in the present invention is 2
Polymers of different viscosities are bonded side by side along the fiber length direction. In general, by sticking polymers having different viscosities, stress concentrates on the high viscosity side during spinning and stretching, and the internal strain greatly differs between the two components. As a result, due to the difference in elastic recovery rate and the difference in heat shrinkage rate after stretching, the high-viscosity side is greatly shrunk, and distortion occurs in the single fiber, resulting in a three-dimensional coil crimp form.
It can be said that the diameter of the three-dimensional coil and the number of coils per single fiber length are determined by the shrinkage difference between the high shrinkage component and the low shrinkage component. The larger the shrinkage difference, the smaller the coil diameter.
The number of coils per unit fiber length increases.

The present inventors have used PTT for the high shrinkage component of the sand-by-side type composite fiber, so that the coil diameter is small, the number of coils per unit fiber length is large, and the settling resistance to expansion of the coil is low. It was found that good raw cotton can be obtained.

Further, by using the composite fiber as at least a part, mixing a part of the heat-adhesive fiber and once opening with a card machine and then heat-treating with a heat treatment machine, the mixing ratio of the heat-adhesive fiber can be made higher than before. It has been found that a significantly reduced fiber cushion material can be obtained.

That is, when the three-dimensionally entangled fibers are heat-treated with a card machine, crimps are produced with a fine coil diameter and number that have not been obtained so far, and the entangled portions are strong. Form a fixed point. Therefore, molding as a fiber cushion material becomes possible without using a large amount of heat-bonding fibers as in the conventional case.

So far, side-by-side type composite fibers have been known. For example, a side-by-side composite fiber of homopolyethylene terephthalate (PET) and highly shrinkable copolymer PET is well known, but when a cushion material is molded using the composite fiber, crimp expression occurs in the cushion material. The ability is low, and there are few strong fixing points formed in the cushion material, and it is difficult to form a three-dimensional mesh structure. As a result, physical deformation easily occurs when strain is applied,
Settling resistance, durability, and cushioning properties are significantly reduced. Furthermore, when copolymerized PET is used as the high shrinkage component, the heat resistance is inferior and the heat settling property is reduced.

As in the present invention, by using PTT as the high shrinkage component, it is possible to significantly reduce the mixing ratio of the heat-adhesive fibers, and as a result, it is possible to provide a cushioning material having excellent heat sink resistance.

Further, solid mechanical crimped fibers, hollow mechanical crimped fibers, hollow structurally crimped fibers by asymmetric cooling, and the like have been used as the matrix fibers, but these fibers are crimped after heat treatment. It does not exhibit shrinkage and can be molded as a fiber cushion material only by using a large amount of heat-bonded fibers. In the case of molding using almost no heat-bonded fibers, the fibers are entangled with each other, but it is difficult for the fibers to become fixed points and the three-dimensional mesh structure is less likely to be formed. In this case, when a strain is applied, the coil part where the coils are entangled finely deforms little by little,
Physical deformation as a cushion material occurs, sag resistance,
Durability and cushioning properties are significantly reduced.

Polyethylene terephthalate (PE) is used as the other polymer other than polytrimethylene terephthalate in the composite fiber constituting the matrix fiber in the present invention.
T), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and other fiber-forming polyesters with good interfacial adhesion with PTT and stable spinnability. There is no particular limitation as long as it is provided. Among them, polytrimethylene terephthalate having different viscosities is particularly preferable in that the melting point is adjusted to stabilize the spinning process, stress can be concentrated on the high-viscosity component, and the difference in shrinkage can be increased. The composite ratio of the polytrimethylene terephthalate component and the other component is 70:30 to 30:70.
It is preferably within the range. The composite ratio means the ratio of weight. The cross-sectional shape of the matrix fiber is
The shape may be circular or irregular, but a circular cross section is preferable for the purpose of improving the adhesiveness with the heat-bonding fiber.

The PTT of the present invention is a polyester obtained by using terephthalic acid as a main acid component and 1,3-propanediol as a main glycol component. It may contain 20 mol%, more preferably 10 mol% or less of a copolymerization component capable of forming another ester bond. As the copolymerizable compound, for example, isophthalic acid, succinic acid, cyclohexanedicarboxylic acid,
Dicarboxylic acids such as adipic acid, dimer acid, sebacic acid and 5-sodium sulfoisophthalic acid, and diols such as ethylene glycol, diethylene glycol, butanediol, neopentyl glycol, cyclohexanedimethanol, polyethylene glycol and polypropylene glycol can be mentioned. However, it is not limited to these. Also, titanium dioxide as a matting agent if necessary, fine particles of silica or alumina as a lubricant,
You may add a hindered phenol derivative, a coloring pigment, etc. as an antioxidant.

The temperature at which the maximum contraction stress is reached is 110.
The maximum value of shrinkage stress is 0.25cN / dtex or higher.
The above is preferable.

The contraction stress is an important characteristic in order to overcome the restraint force in the cushion material and to develop the coil crimp. The higher the shrinkage stress, the better the crimp developability under constraint in the cushion material. As a result of various studies on the temperature at the time of molding the cushioning material and the restraining force in the cushioning material, in order to enhance the crimp developability at the time of molding the cushioning material, the temperature showing the maximum of the contraction stress is 110 ° C or more and the maximum value of the contraction stress. Is 0.25c
It is preferably N / dtex or more.

By using the side-by-side composite fiber having a shrinkage characteristic within such a specific range, the fixed points where the coils are finely entangled with each other become stronger, and the entire cushion material can have a three-dimensional coil spring-like network structure. Therefore, the soft texture and elasticity are excellent, and the high heat resistance to sag can be maintained.

The fiber cushion material of the present invention is preferably thermoformed by using 0% by weight or more and 30% by weight or less of the heat-bonding fiber which is heat-melted at 180 ° C. or less.

Even in the case of 0% by weight without using any heat-adhesive fiber, the three-dimensional network structure formed in the fiber cushion material is firm, and the physical deformation when strain is applied is small and the resistance to abrasion is low. There are no problems regarding fatigue resistance, durability and cushioning.

Further, by mixing about 5% by weight of the heat-adhesive fiber, the hardness of the cushion material is improved and the moldability is increased.
On the other hand, when the mixing ratio of the heat-bonding fibers exceeds 30% by weight, the number of heat-bonding points increases, and as a result, the moldability increases, which is preferable. However, in addition to the harder texture, the proportion of the base material fiber that is responsible for sag resistance and durability is less than 70% with respect to deformation when strain is applied, so deformation with strain is applied. In addition, it is not preferable because the settling resistance and durability tend to be significantly reduced.

Therefore, the content of the heat-bonding fiber in the fiber cushion material of the present invention is preferably 0% by weight or more and 30% by weight or less, more preferably 5% by weight or more and 20% by weight or less.

As in the present invention, the amount of heat-bonded fibers used is reduced to form a three-dimensional coil spring-like network structure,
By producing the fiber cushion material, the coil of each fiber is gradually deformed to absorb force and strain regardless of the direction in which the fiber cushion is deformed, and the high thermal fatigue resistance can be maintained.

The shape of the cross section of the heat-bonding fiber to be mixed with the matrix fiber of the present invention may be circular or irregular. The denier of the heat-bonded fiber is usually about 1 to 10 decitex, but is preferably less than 5 denier. The fiber length should be 5 to 100 mm, increasing the number of adhesion points.
From the viewpoint of improving dispersibility, it is more preferably 60 mm or less.

The polymer constituting the heat-bonded fiber is
With terephthalic acid and / or 2,6-naphthalenedicarboxylic acid as the main acid component, ethylene glycol, propylene glycol, tetramethylene glycol, cyclohexane-1,4-dimethanol, pentamethylene glycol, hexamethylene glycol, bisphenol S
Is a polyester containing at least one selected from the EO adducts (BPS-EO) as a main glycol component, and the following components may be copolymerized.

Preferred copolymerization components include aliphatic dicarboxylic acids such as adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and diphenyldicarboxylic acid, oxycarboxylic acids such as oxybenzoic acid, and / Or 1 out of glycols such as diethylene glycol, propylene glycol, polyethylene glycol, 5-sodium sulfoisophthalic acid, EO adduct of bisphenol A (BPA-EO), etc.
Or two or more copolymerization components.

However, in the case of polyethylene glycol,
If the number average molecular weight exceeds 10,000, the reactivity in polymer synthesis is remarkably reduced, and unreacted matter may be incompatible with polyester and may significantly impair the spinnability. Therefore, use a number average molecular weight of 10,000 or less. Is preferred.

A cushioning material, which is obtained by using the base material fibers of the present invention to form a monolithic structure by point-bonding thermobonding fibers by thermoforming,
Sag resistance at 70 ° C is preferably 75% or more, 80%
The above is more preferable, and the above is 90% or more, further preferable.

If it is less than 75%, the cushioning material is liable to become tired and the strain does not recover when a load is applied in a high temperature atmosphere such as in the summer, so that the intended effect of the present invention cannot be sufficiently obtained.

The cushion material of the present invention is composed of base material fibers and heat-bonding fibers, which are mixed at a constant mixing ratio and once opened with a card machine, and then webs are laminated to obtain a constant density. It is a cushion material formed into a monolithic structure by compressing into a sheet, thermoforming with hot air at 200 ° C. for 30 minutes in a heat treatment machine, and then cooling. According to the knowledge of the present inventors, the base material according to the present invention is obtained. Cushioning material using at least 70% fiber has 75% sag resistance at 70 ° C.
It is at least 80%, preferably at least 90%.

The density of the cushion material is not particularly limited, but it is preferably within the range of 0.02 or more and 0.06 or less (g / cc).

The cushion material of the present invention is suitable for use in vehicles exposed to high temperatures. The reason for this is that the cushioning material using the composite fiber containing at least one of polytrimethylene terephthalate has heat-resistant settling property, and by using the composite fiber, the heat-bonding fiber which adversely affects the heat-setting property. The cushioning material can be molded by significantly reducing the mixing ratio of.

Such vehicles are mainly used for trains,
It is used as a cushion material for seats of automobiles and the like, but as other applications, it may be used as a ceiling material of automobiles, a dash insulator, a floor insulator, and the like.

Since a cushioning material having a soft texture and a high elasticity can be obtained, it can be used not only as a vehicle application but also as a futon application for bedding, cushioning such as a bottom lining, a backrest, and a pillow.

[0047]

EXAMPLES Each characteristic value defined in the present invention was obtained by the following method. (1) Intrinsic viscosity: Orthochlorophenol (hereinafter, OC
0.8 g of the sample polymer was dissolved in 10 ml with (P) as a solvent, and the relative viscosity ηr was determined by the following equation using an Ostwald viscometer at 25 ° C., and IV was calculated.

Ηr = η / η0 = (t × d) / (t ₀ × d ₀ ) IV = 0.0242 ηr + 0.2634 where η: viscosity of polymer solution, η0: viscosity of OCP,
t: drop time of solution (second) d: density of solution (g / cm ³ ), t0: drop time of OCP (second) d0: density of OCP (g / cm ³ ) (2) shrinkage stress: of the present invention The short fiber is put into a heating device having a strain gauge, one end is fixed and the other end is set in the strain gauge, and the fineness (decitex) × 0.9 × (1/3)
0) An initial load of gf was applied, and the stress obtained by raising the temperature under the condition of 150 ° C./min was plotted on the chart at 10 ° C./cm. The maximum value of the contraction stress is defined as the maximum contraction stress, and the temperature indicating the maximum contraction stress is defined as the peak temperature of the maximum contraction stress. (3) Melting point (Tm): Using a melting point microscope, the temperature at which the heat-adhesive fiber melts and starts to flow at a temperature rising temperature of 10 ° C./min was determined. (4) 70 ° C. sag resistance: A cushion material was cut into a cube (10 × 10 × 10 cm) as a measurement sample and measured using a plane parallel plate (vertical × width = 15 × 15 cm).

In the cutting method from the cushion material, the direction in which the fibers are compressed at the time of forming the cushion is judged from the fiber arrangement inside the cushion material, and the compressed direction and one surface of the cube are substantially parallel. It is cut out to become. However, when the thickness is less than 10 cm, it is possible to stack 10 c
The above cube is prepared so as to be m.

The compression in the sag test is such that the web is compressed to a thickness of 50% in the plane direction having the same direction as the direction in which the web is compressed when the molded body is manufactured (the side surface is in a free state). In that state, after holding in 70 ° C dry heat for 22 hours,
The thickness after being removed from the plane-parallel plate to release the strain to stop the compression action, and then moved to room temperature (about 30 ° C) as it is and left (standing) for 1 day (24 hours) in that state
From i (cm) and the original thickness before processing 10 (cm),
It was calculated by {(li / 10) × 100)} (%).

The thickness is measured in units of 0.1 cm, and the number n is 5.
And (5) Cushion texture: Ranking the texture (softness, elasticity) when 10 panelists press with their hands,
Very good (10 points), good (8 points), normal (5 points),
It was evaluated as poor (0 point), and when the average point exceeds 8 points, the cushioning material has a very good texture ◎,
7 points or more and 8 points or less were evaluated as good ◯, 4 points or more and less than 7 points were evaluated as normal Δ, and less than 4 points were evaluated as poor x. Example 1 Intrinsic viscosity (IV) 1.12 (melt viscosity 1120 poi
(se) homo PTT and an intrinsic viscosity (IV) of 0.65 (melt viscosity 260 poise) are separately melted, respectively, and a spinning ratio of 285 ° C. is obtained by a conventional spinning machine at a composite ratio of 50/50 by weight. It was discharged from the bimetal composite spinneret and wound up at a speed of 1350 m / min. Subsequently, the undrawn yarns are combined, and the draw ratio is 3.0 times and the draw temperature is 90.
It was stretched in a warm bath at ℃, subjected to mechanical crimping in a stuffing box, and then cut to obtain a base material fiber having a cut length of 6.6 dtex and a cut length of 51 mm. The spinnability and drawing were good, and no yarn breakage occurred.

As the polymer used for the sheath component of the heat-bonded fiber, the acid components are 60 mol% of dimethyl terephthalate (DMT), 40 mol% of dimethyl isophthalate (DMI) and 100 mol% of ethylene glycol (EG) in a small amount. A catalyst and a stabilizer were charged, a transesterification reaction was carried out by a known method, and then polycondensation was performed while heating and decompressing to obtain a polymer having a low melting point to be used for the sheath portion. This polymer had a glass transition temperature of 67 ° C and a melting point of 110 ° C.

The polymer (polyethylene terephthalate; homo PET, IV 0.65) used as the other component (core component) was melted at 260.degree.
It melts at 0 ° C., and is discharged from the spinneret at a spinning temperature of 292 ° C. from a normal spinning machine at a composite ratio = 50/50 weight ratio,
It was wound at a speed of 1350 m / min. Subsequently, the unstretched yarns are combined and stretched at a draw ratio of 3.0 times in a 80 ° C. hot bath to give 4.4 dtex, and then mechanically crimped 5
It was cut to 1 mm. The properties of the resulting heat-bonded fiber are shown in Table 1.

Next, the obtained base material fibers and the heat-bonding fibers were mixed at a mixing ratio of 15%, opened with a card, laminated with a web to give a basis weight of 4000 g / m ^2, and compressed to a thickness of 10 cm. After thermoforming with hot air of 200 ° C. for 30 minutes, it was cooled to obtain a cushion material. Table 1 shows the results of evaluation of the cushion material.

[0055]

[Table 1]

In Example 1, a cushion material was prepared by using the base material fibers defined by the present invention. This cushion material has a soft texture and elasticity, is excellent in cushioning property, and is resistant to 70 ° C. The sagability was also very good. Examples 2 and 3 The other polymer to be bonded to PTT was PBT, P
Short fibers were obtained in the same manner as in Example 1 except that ET was used. The evaluation results are shown in Table 1.

These cushion materials also have a soft texture and elasticity, excellent cushioning properties, and a temperature of 70 ° C.
The result was good sag resistance. Comparative Example 1 A short fiber was obtained in the same manner as in Example 3 except that the high viscosity component was PET. The evaluation results are shown in Table 1.

Compared to Example 3, the cushion material of Comparative Example 1 was poor in softness and elasticity. The sag resistance at 70 ° C. was also at a low level. In addition, the moldability was poor and the cushion material tended to deform easily. Examples 4 and 5 Short fibers were obtained in the same manner as in Example 1 except that the intrinsic viscosity (IV) of the PTT to be laminated was changed to reduce the shrinkage stress. The evaluation results are shown in Table 2.

[0059]

[Table 2]

The cushioning material using the base material fiber whose contraction stress is reduced to 0.25 cN / dtex or less is inferior in cushioning property and 70 ° C. sag resistance to Example 1, but is practically at a sufficient level. Examples 6 to 9 were the same. Using the matrix fiber obtained in Example 1, the cushioning material was molded by changing the mixing ratio of the heat-bonding fiber. The evaluation results are shown in Tables 1 and 2.

In Example 6, the cushion material was molded without using any heat-adhesive fiber, but the matrix material was crimped into a coil and the fibers were entangled with each other to mold the cushion material. The cushioning material was elastic and also had excellent settling resistance at 70 ° C.

In Examples 7 to 9, the cushioning material was molded by changing the mixing ratio of the heat-bonding fibers from 5% to 40%.
When the mixing ratio of the heat-bonded fibers was increased, both the cushioning property and the 70 ° C. settling resistance decreased, but it was an excellent level with no practical problems. Comparative Examples 2 to 5 Using the short fibers obtained in Comparative Example 1, the cushioning material was molded by changing the mixing ratio of the heat-bonding fibers. The evaluation results are shown in Table 2.
When the mixing ratio of the heat-bonding fibers was in the range of 0 to 5%, the cushion material could not be molded and the cushioning property was remarkably inferior. Molding is possible when the mixing ratio of heat-bonding fibers is 30, 40%,
The cushioning property was hard and the elasticity was poor. Furthermore, 70
The ℃ set resistance tended to deteriorate. Examples 10-13 Example 1 except that the polymer combination of Example 1 was used, but the ratio of high viscosity polymer to low viscosity polymer was varied.
A cushion material was obtained in the same manner as in.

At any level, cushioning property,
It exhibited a high level of sag resistance at 70 ° C. However, when the ratio of the low-viscosity polymer becomes high, the shrinkage stress tends to decrease, and the cushioning property and the 70 ° C sag resistance tend to decrease. On the contrary, when the ratio of the low-viscosity polymer is low, the shrinkage stress is high, but also in this case, the cushioning property and the 70 ° C. sag resistance tended to be slightly lowered.

As is clear from the above results, the polymer of the type according to the present invention is laminated side by side along the fiber length direction, and at least one is a polyester mainly composed of polytrimethylene terephthalate. It is clear that the cushioning material using the composite fibers bonded in the side-by-side type along the depth direction has a soft texture and a rich texture and further has improved sag resistance at 70 ° C. .

[0065]

EFFECTS OF THE INVENTION According to the present invention, a cushion material having a soft texture and elasticity, and particularly having a high heat settling property, is used especially for applications such as vehicles, which are exposed to high temperatures. Can be provided.

Continued front page    F term (reference) 3B096 BA00                 4L047 AA21 AA27 BA09 BB06 CB05                       CC09 CC16

Claims (7)

[Claims] 1. A fiber cushion material in which two kinds of polymers are bonded side by side along the fiber length direction and at least one of them is a composite fiber which is a polyester mainly composed of polytrimethylene terephthalate. 2. The composite fiber has a maximum contraction stress temperature of 110 ° C. or higher and a maximum contraction stress value of 0.2.
5. It is 5 cN / dtex or more, and
The described fiber cushion material. 3. A heat-bonding fiber which is heat-melted at 180 ° C. or lower,
The fiber cushion material according to claim 1 or 2, which is thermoformed by using 0% by weight or more and 30% by weight or less. 4. The fiber cushion material according to claim 1, having a 70 ° C. sag resistance of 75% or more. 5. The fiber cushion material according to claim 1, which is used as a cushion material for a vehicle. 6. The fiber cushion material according to claim 1, wherein the components other than polytrimethylene terephthalate are polytrimethylene terephthalate having different viscosities. 7. The composite ratio of the polytrimethylene terephthalate component and the other component is in the range of 70:30 to 30:70, and the composite ratio is in the range of 1, 2, 3, 4, 5, or 6. Fiber cushion material.