JP2013090662A - Cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion using a three-dimensional random loop joint structure of a continuous filamentous form which has excellent cushion performance and silence.SOLUTION: The cushion includes: the three-dimensional random loop joint structure in which 100-100,000 decitex of the continuous filamentous form is wound to form random loops and each of the loops is brought into contact with each other in a fusion state to cause the most part of the contact part to be fused; and a package wrapping up the three-dimensional random loop joint structure. The Tanδ of the continuous filamentous form at 23°C is 0.10 or more, and a 25% compression hardness of the three-dimensional random loop joint structure is 10 kg/Φ200 or more.

Description

  The present invention relates to a cushion using a continuous linear three-dimensional random loop joint structure.

  For example, Patent Document 1 proposes to use, as a cushion material, a cushion network structure that is excellent in heat resistance, durability, and cushioning properties, hardly stuffs, and is easy to recycle. In the network structure for cushion described in Patent Document 1, a continuous linear body of 300 denier or more made of a polyester copolymer thermoplastic elastic resin is twisted to form a random loop, and the loops are in contact with each other in a molten state. At least, it is composed of a three-dimensional random loop joint structure in which most of the contact portion is fused.

  However, there is a problem that the sound is noisy because the sound that the random loops are rubbed and the sound that the random loops are repelled when the cushion material is compressed and recovered.

  Therefore, for example, in Patent Document 2, as a polyester-based elastic network structure excellent in cushioning and quietness, a continuous linear body having a fineness of 300 dtex or more made of a polyester copolymer is bent and formed into a random loop. The resin containing the silicone resin is 0.4 to 4 weight on the random loop surface of the three-dimensional random loop bonded structure in which the respective loops are brought into contact with each other in a molten state and most of the contact portions are fused. It has been proposed to use a polyester-based elastic network structure with a% adhesion for the cushion body.

  In the cushion body using the polyester-based elastic network structure described in Patent Document 2, although the sound of rubbing between the random loops during compression and recovery of the cushion body has been reduced, the random loops seemed to be able to play. However, there was still room for improvement in terms of quietness.

JP 7-68061 A JP 2010-43376 A

  In view of the above circumstances, an object of the present invention is to provide a cushion using a continuous linear three-dimensional random loop joint structure, which is excellent in cushioning and quietness.

  The present invention is a three-dimensional random loop formed by winding a continuous linear body of 100 to 100,000 decitex to form a random loop, bringing the respective loops into contact with each other in a molten state, and fusing most of the contact portions. A bonded structure and a package that encloses the three-dimensional random loop bonded structure, and the Tanδ at 23 ° C. of the continuous linear body is 0.10 or more, and 25% compression of the three-dimensional random loop bonded structure It is a cushion having a time hardness of 10 kg / Φ200 or more.

  Here, in the cushion of the present invention, the continuous linear body is preferably made of a thermoplastic elastomer, more preferably a mixture of two or more different thermoplastic elastomers. In addition, it is preferable that a continuous line body contains a polyester-type thermoplastic elastomer.

  Moreover, in the cushion of this invention, it is preferable that a continuous linear body has a hollow cross section.

  Moreover, in the cushion of this invention, it is preferable that a continuous linear body has a deformed cross section.

  ADVANTAGE OF THE INVENTION According to this invention, it is a cushion using the continuous linear body three-dimensional random loop joining structure, Comprising: The cushion excellent in cushioning property and silence can be provided.

It is a typical perspective view of the cushion of an embodiment which is an example of the cushion of the present invention. It is a typical expanded sectional view in alignment with II-II of FIG. (A) is a typical perspective view of an example of the three-dimensional random loop joining structure used for the cushion of the embodiment, and (b) is a schematic perspective view of the three-dimensional random loop joining structure shown in (a). It is an expansion perspective view. (A), (b) is typical sectional drawing of an example of the continuous linear body shown to Fig.3 (a) and FIG.3 (b). (A)-(c) is typical sectional drawing illustrating an example of the irregular cross section of a continuous linear body. It is a typical block diagram which illustrates a part of example of the manufacturing apparatus of a three-dimensional random loop structure. It is a typical block diagram illustrating an example of the manufacturing apparatus of a three-dimensional random loop structure. It is a typical perspective view illustrating an example of the usage pattern of the cushion of an embodiment.

  Embodiments of the present invention will be described below. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

<Cushion>
FIG. 1 shows a schematic perspective view of a cushion according to an embodiment which is an example of the cushion of the present invention, and FIG. 2 shows a schematic enlarged cross-sectional view along II-II in FIG. As shown in FIG. 1 and FIG. 2, the cushion 1 of the present embodiment includes a three-dimensional random loop joint structure 10 and a package 11 that wraps the three-dimensional random loop joint structure 10.

  As the three-dimensional random loop joint structure 10, a linear loop (continuous linear body 21) is twisted to form a random loop 22, and the respective loops 22 are brought into contact with each other in a molten state, so that most of the contact portion is formed. What is fused is used.

  The package 11 can be used without particular limitation as long as it can wrap the three-dimensional random loop joint structure 10. For example, a cover conventionally used for a cushion can be suitably used.

  In the cushion 1 of the embodiment, the three-dimensional random loop joint structure 10 has the following three requirements (i) to (iii). Therefore, while having favorable cushioning properties, it is possible to provide a cushion that is superior in quietness than before.

(I) The fineness of the continuous linear body 21 is 100 to 100,000 decitex.
(Ii) Tan δ (tangent delta) at 23 ° C. of the continuous linear body 21 is 0.10 or more.

  (Iii) The 25% compression hardness of the three-dimensional random loop joint structure 10 is 10 kg / Φ200 or more.

  The present inventors reduce the sound at the time of compression and recovery, such as a repelling sound and a rubbing sound, by the three-dimensional random loop joint structure 10 satisfying the requirements (i) to (iii) at the same time. However, the present inventors have found that elasticity is ensured and have completed the present invention.

  For example, in conventional network structures such as those described in Patent Document 1 and Patent Document 2, a sound such that a random loop is rubbed or a sound that a random loop can be played is generated during compression or compression recovery. However, since the cushion 1 of the present embodiment includes the three-dimensional random loop joint structure 10 having the above three requirements (i) to (iii), these sounds are greatly reduced. However, it has an excellent effect in that the elasticity at the time of compression is maintained at the same level as that of the conventional network structure.

<Continuous linear structure>
FIG. 3A shows a schematic perspective view of an example of the three-dimensional random loop joint structure 10 used in the cushion 1 of the embodiment, and FIG. 3B shows the tertiary shown in FIG. A schematic enlarged perspective view of the original random loop joint structure 10 is shown.

  As shown in FIGS. 3A and 3B, the three-dimensional random loop joint structure 10 is formed by winding a continuous filament (continuous linear body 21) having a fineness of 100 to 100,000 decitex. The linear bodies 21 have a three-dimensional network structure joined at least at a part thereof.

  The continuous linear body 21 has a curved random loop 22 that is not a complete ring shape or a complete ring shape due to the winding of the continuous linear body 21. The three-dimensional random loop joint structure 10 has a joint where the random loop 22 of the continuous linear body 21 is joined to the random loop 22 of another continuous linear body 21. Here, the joint portion of the random loop 22 is formed by bringing the random loops 22 of the continuous linear body 21 into contact with each other in a molten state and fusing most of the contact portions.

<Fineness of continuous linear body>
The fineness of the continuous linear body 21 is 100 to 100,000. When the fineness of the continuous linear body 21 is 100 or more, the compressive force is increased, the repulsive force is increased, and the cushioning property of the cushion 1 using the three-dimensional random loop joint structure 10 is improved. . On the other hand, when the fineness of the continuous linear body 21 is 100,000 or less, the individual linear compression force of the continuous linear body 21 is increased, and the continuous linear body 21 constituting the three-dimensional random loop joint structure 10 is provided. Therefore, even when a remarkably large compressive force of, for example, 100 kg / cm ² or more is applied, the compressive force is dispersed, and the occurrence of sag due to stress concentration (compression permanent set) can be suppressed. From the viewpoint of improving the cushioning property of the cushion 1 and effectively suppressing the occurrence of sag due to stress concentration, the fineness of the continuous linear body 21 is preferably 300 to 50000 dtex, and 500 to 30000. More preferred is decitex. In addition, the continuous linear body 21 uses not only the continuous linear body 21 which consists of a filament of a single fineness but the continuous linear body 21 which consists of a filament with different fineness, and is the optimal in combination with an apparent density. It can also be configured.

<Tan δ of continuous linear body>
Tan δ at 23 ° C. of continuous linear body 21 is 0.10 or more, preferably 0.12 or more, and more preferably 0.15 or more. When Tan δ at 23 ° C. of continuous linear body 21 is 0.10 or more, preferably 0.12 or more, particularly 0.15 or more, three-dimensional random loop joined structure 10 is formed. The vibration sound caused by the random loop 22 can be played when the cushion 1 used is compressed or recovered after compression can be sufficiently reduced.

  Further, Tan δ of the continuous linear body 21 is particularly preferably 0.10 or more in all temperature ranges of 0 ° C to 23 ° C. In this case, the silence of the cushion 1 can be maintained in a wide temperature range.

  The upper limit of Tan δ at 23 ° C. of continuous linear body 21 is not particularly limited, but Tan δ at 23 ° C. of continuous linear body 21 is preferably 1.00 or less, and preferably 0.80 or less. More preferably, it is 0.50 or less. When Tan δ at 23 ° C. of continuous linear body 21 is 1.00 or less, preferably 0.80 or less, particularly 0.50 or less, cushioning property of cushion 1 is good. It can be.

<25% compression hardness of 3D random loop joint structure>
The hardness at the time of 25% compression of the three-dimensional random loop joint structure 10 is 10 kg / Φ200 or more, preferably 15 kg / Φ200 or more, and more preferably 20 kg / Φ200 or more. When the hardness at 25% compression of the three-dimensional random loop joint structure 10 is 10 kg / Φ200 or more, preferably 15 kg / Φ200 or more, particularly 20 kg / Φ200 or more, the three-dimensional random loop Since the joint structure 10 has a sufficient repulsive force, the cushioning property of the cushion 1 is more excellent. The 25% compression hardness of the three-dimensional random loop joint structure 10 is a stress-strain obtained by compressing the three-dimensional random loop joint structure 10 to 75% with a circular compression plate having a diameter of 200 mm. It is the stress at 25% compression of the curve.

  The upper limit of the 25% compression hardness of the three-dimensional random loop joint structure 10 is not particularly limited, but the 25% compression hardness of the three-dimensional random loop joint structure 10 is preferably 50 kg / Φ200 or less, and more Preferably it is 45 kg / Φ200 or less, more preferably 40 kg / Φ200 or less. When the hardness at 25% compression of the three-dimensional random loop joint structure 10 is 50 kg / Φ200 or less, preferably 45 kg / Φ200 or less, particularly 40 kg / Φ200 or less, the cushion 1 of the cushion 1 The property becomes more excellent.

<Continuous linear material>
The resin portion of the continuous linear body 21 is preferably made of a thermoplastic elastomer from the viewpoint of both cushioning properties and quietness. Examples of the thermoplastic elastomer include polyester-based thermoplastic elastomers, styrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and the like.

  Examples of the polyester-based thermoplastic elastomer include a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylene diol as a soft segment, or a polyester ester block copolymer having an aliphatic polyester as a soft segment. More specific configurations of the polyester ether block copolymer include terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, and the like. Selected from aromatic dicarboxylic acids, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, succinic acid, adipic acid, aliphatic dicarboxylic acids such as dimer acid, or ester-forming derivatives thereof. At least one dicarboxylic acid, 1,4-butanediol, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol and other aliphatic diols, 1,1-cyclohexanedimethanol, 1,4 -Cyclohexanedimethanol and other alicyclic rings At least one diol component selected from diols or ester-forming derivatives thereof, and polyethylene glycol, polypropylene glycol, polytetramethylene glycol, or ethylene oxide-propylene oxide copolymer having an average molecular weight of about 300 to 5000 A ternary block copolymer comprising at least one polyalkylenediol selected from Examples of the polyester ester block copolymer include a ternary block copolymer composed of at least one of the dicarboxylic acid, a diol, and a polyester diol such as a polylactone having an average molecular weight of about 300 to 5000.

  In consideration of thermal adhesiveness, hydrolysis resistance, stretchability, heat resistance, etc., (1) terephthalic acid or / and isophthalic acid as dicarboxylic acid, 1,4-butanediol, polyalkylene as diol component A ternary block copolymer comprising polytetramethylene glycol as a diol, and (2) terephthalic acid or / and naphthalene-2,6-dicarboxylic acid as a dicarboxylic acid, 1,4-butanediol as a diol component, polyester diol As a ternary block copolymer comprising polylactone. Particularly preferred is (1) a ternary block copolymer comprising terephthalic acid or / and isophthalic acid as the dicarboxylic acid, 1.4 butanediol as the diol component, and polytetramethylene glycol as the polyalkylenediol. As a special example, a polysiloxane-based soft segment can be used.

  Examples of the styrene thermoplastic elastomer include styrene-butadiene random copolymers, styrene-isoprene random copolymers, and styrene thermoplastic elastomers obtained by hydrogenating them.

  Examples of the polyolefin-based thermoplastic elastomer include an ethylene-propylene random copolymer and an ethylene-isoprene random copolymer.

  As the polyamide-based elastomer, the hard segment has nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, etc. and their copolymer nylon as a skeleton, and the soft segment has an average molecular weight of about 300 to 5,000. Examples include those using block copolymers composed of at least one of polyalkylene diols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene oxide-propylene oxide copolymer, alone or in admixture of two or more. Is done. Further, blended or copolymerized non-elastomeric components can be used in the present invention.

  Polyurethane elastomers include (A) a polyether and / or polyester having a hydroxyl group at the terminal with a number average molecular weight of 1000 to 6000 and (B) an organic compound in the presence or absence of a normal solvent (dimethylformamide, dimethylacetamide, etc.). A typical example is (C) a polyurethane elastomer in which a chain is extended with a polyamine containing diamine as a main component in a prepolymer obtained by reacting a polyisocyanate containing diisocyanate as a main component with both ends being isocyanate groups. The polyesters and polyethers of (A) include polybutylene adipate copolymer polyester, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene oxide-propylene oxide copolymer having an average molecular weight of about 1000 to 6000, preferably 1300 to 5000. Polyalkylene diols such as coalescence are preferred. As the polyisocyanate of (B), a conventionally known polyisocyanate can be used, but an isocyanate mainly composed of diphenylmethane-4,4′-diisocyanate is used. Addition may be used. As the polyamine (C), known diamines such as ethylenediamine and 1,2-propylenediamine are mainly used, and a trace amount of triamine and tetraamine may be used in combination as required. These polyurethane elastomers may be used alone or in combination of two or more. In addition, the thermoplastic elastomer of the present invention includes those obtained by blending non-elastomeric components with the above elastomer and those obtained by copolymerization.

  The resin portion of the continuous linear body 21 is preferably composed of a mixture of two or more different thermoplastic elastomers. In general, increasing Tan δ of the continuous linear body 21 and increasing the 25% compression hardness of the three-dimensional random loop joint structure 10 are in a trade-off relationship. That is, the larger the Tan δ of the continuous linear body 21 is, the smaller the 25% compression hardness of the three-dimensional random loop joint structure 10 is, and the larger the 25% compression hardness of the continuous linear body 21 is the continuous linear body. The Tan δ of 21 is reduced. Tan δ is the ratio E ″ / E ′ of the loss elastic modulus E ″ and storage elastic modulus E ′ measured using a dynamic viscoelasticity measuring device. The higher the value, the more the vibration damping property. This increases the vibration noise reduction effect.

  By constituting the continuous linear body 21 complementarily with a mixture of two or more different thermoplastic elastomers, both the size of Tan δ and the hardness at 25% compression are compatible, that is, excellent in cushioning properties, and The cushion 1 using the three-dimensional random loop joint structure 10 with high silence can be realized.

  In the cushion according to the embodiment, two or more different thermoplastic elastomers were measured using a dynamic viscoelasticity measuring device as one or more high modulus thermoplastic elastomers having a flexural modulus of 0.1 GPa or more. It is preferable to use one or more high tan δ thermoplastic elastomers having a Tan δ at 0.2 ° C. of 0.20 or more in a complementary manner. Bending elastic modulus is an elastic modulus calculated from a load-deflection curve when a rod-shaped test piece having a rectangular cross section is supported at a fixed fulcrum interval (span) and a bending load is applied by applying a pressure wedge to the center. It is. The mixing ratio of two or more different thermoplastic elastomers is not particularly specified, but preferably 95/5 to 50/50 by weight ratio of the high modulus thermoplastic elastomer and the high Tan δ thermoplastic elastomer, More preferably, it is 90 / 10-55 / 45, Most preferably, it is 85 / 15-60 / 40. When it is 100/0 to 95/5 or 50/50 to 0/100, it is not preferable from the viewpoint of achieving both cushioning properties and quietness.

  As the high Tan δ thermoplastic elastomer, it is preferable to use a styrene thermoplastic elastomer and / or a polyolefin thermoplastic elastomer, more preferably a styrene thermoplastic elastomer, and a styrene thermoplastic elastomer containing a hydrogenated portion. More preferably, an elastomer is used. In these cases, both the cushioning properties and the quietness of the cushion 1 tend to be excellent.

  As the high modulus thermoplastic elastomer, a polyester thermoplastic elastomer and / or a polyamide thermoplastic elastomer is preferably used, a polyester thermoplastic elastomer is more preferably used, and a polyester ether block copolymer is preferably used. Further preferred. In these cases, both the cushioning properties and the quietness of the cushion 1 tend to be excellent.

  Various additives can be blended in the resin portion of the continuous filament 21 depending on the purpose. Additives include phthalate ester, trimellitic acid ester, fatty acid, epoxy, adipic acid ester, polyester plasticizer, known hindered phenol, sulfur, phosphorus and amine oxidation Light stabilizers such as inhibitors, hindered amines, triazoles, benzophenones, benzoates, nickels, salicyls, antistatic agents, molecular modifiers such as peroxides, epoxy compounds, isocyanate compounds, carbodiimide compounds Compounds having reactive groups such as, metal deactivators, organic and inorganic nucleating agents, neutralizing agents, antacids, antibacterial agents, fluorescent whitening agents, fillers, flame retardants, flame retardant aids, organic In addition, inorganic pigments and the like can be added.

  The resin portion of the continuous linear body 21 preferably has an endothermic peak below the melting point in a melting curve measured with a differential scanning calorimeter (DSC). Those having an endothermic peak below the melting point are significantly improved in heat resistance and sag resistance than those having no endothermic peak.

  For example, as the polyester-based thermoplastic elastomer constituting the resin portion of the continuous linear body 21, terephthalic acid, naphthalene-2, 6-dicarboxylic acid and the like, which are rigid in the acid component of the hard segment, are 90 mol% or more, more preferably Is 95 mol% or more, particularly preferably 100 mol%, and the glycol component is transesterified and polymerized to the required degree of polymerization, and then, as a polyalkylene diol, the average molecular weight is preferably 500 to 5000, More preferably 1000 to 3000 polytetramethylene glycol is copolymerized in an amount of 10% to 70% by weight, more preferably 20% to 60% by weight. High terephthalic acid and naphthalene-2,6-dicarboxylic acid content Ha - it improves crystallinity of de segments, hardly plastically deformed, and sex is improved sag heat resistance and.

  In addition, when the annealing treatment is performed at a temperature lower than the melting point by at least 10 ° C. after the fusion heat bonding, the heat resistance, heat resistance and sag resistance of the continuous linear body 21 are improved. When the annealing treatment is performed after the compressive strain of the continuous linear body 21 is applied, the heat resistance and sag resistance of the continuous linear body 21 are further improved.

  In the continuous linear body 21 subjected to such treatment, an endothermic peak appears more clearly in a melting curve measured with a differential scanning calorimeter in a temperature range from room temperature to the melting point. When the annealing treatment is not performed, no endothermic peak appears in the temperature range of the melting curve from room temperature to the melting point. It can be inferred from this that the annealing process rearranges the hard segments, forms pseudo-crystallization-like crosslinking points, and improves heat resistance and sag resistance. It is conceivable (hereinafter, this annealing process may be referred to as “pseudo crystallization process”). This pseudo crystallization treatment effect is also effective for polyamide-based thermoplastic elastomers and polyurethane-based thermoplastic elastomers.

<Cross-sectional shape of continuous linear body>
4A and 4B are schematic cross-sectional views of the continuous linear body 21. FIG. The cross-sectional shape of the continuous linear body 21 is not particularly limited. For example, as shown in the schematic cross-sectional view of FIG. 4A, the continuous linear body 21 may have a circular solid cross-section, or the cross-sectional shape of FIG. As shown in the schematic sectional view, it may have a hollow section having a hollow portion 33 inside. Further, as shown in the schematic cross-sectional views of FIGS. 5A to 5C, a triangular shape (FIG. 5A), a Y shape (FIG. 5B), or a star shape (FIG. It may have an irregular cross section different from the circular cross section as in c)). By making the cross-sectional shape of the continuous linear body 21 into a hollow cross section or an irregular cross section, the continuous linear body 21 can be provided with anti-compressibility and bulkiness, and the fineness can be lowered.

  The compressibility of the three-dimensional random loop joint structure 10 can be adjusted by the modulus of the material used for the continuous linear body 21. For example, when a soft material is used for the continuous linear body 21, the gradient of the initial compressive stress can be adjusted by increasing the hollow ratio and the degree of deformation. In addition, for example, when a material having a slightly high modulus is used for the continuous linear body 21, it is possible to impart anti-compressibility with good sitting comfort by reducing the hollowness and the degree of deformity. As another effect when the cross-sectional shape of the continuous linear body 21 is a hollow cross-section or an irregular cross-section, a three-dimensional random loop is provided when the same anti-compression property is imparted by increasing the hollow ratio or the degree of irregularity. It becomes possible to further reduce the weight of the bonded structure 10.

<Configuration of three-dimensional random loop joint structure>
Apparent density of the three-dimensional random loop bonded structure 10 is preferably from 0.005 g / cm ³ or more ^{0.2g / cm 3, 0.01g / cm} 3 or more 0.1 g / cm ³ that less is Is more preferably 0.03 g / cm ³ or more and 0.06 g / cm ³ or less. If the apparent density of the three-dimensional random loop bonded structure 10 is 0.005 g / cm ³ or more 0.2 g / cm ³ or less, when more preferably 0.01 g / cm ³ or more 0.1 g / cm ³ or less More preferably, in the case of 0.03 g / cm ³ or more and 0.06 g / cm ³ or less, a repulsive force having a magnitude suitable for the three-dimensional random loop joint structure 10 appears, and the comfort of the cushion 1 is improved. It tends to be good.

  The three-dimensional random loop joint structure 10 may have a multi-layer structure formed by laminating a plurality of layers of three-dimensional random loop joint structures using continuous linear bodies 21 having different finenesses, for example. In this case, preferable characteristics can be imparted by changing the apparent density of each layer. For example, the three-dimensional random loop joint structure 10 includes a basic layer using a continuous linear body 21 having a large fineness and a surface layer using a continuous linear body 21 having a small fineness provided on the basic layer. Consider the case. In this case, the apparent density of the surface layer is slightly increased to increase the number of constituents of the continuous linear body 21, and the stress received by one of the continuous linear bodies 21 is reduced to efficiently distribute the stress. The cushion 1 is given a good cushioning property, and the basic layer is made slightly harder by using the continuous linear body 21 having a high fineness, the apparent density is made higher than that of the surface layer, and the vibration absorption and body shape of the cushion 1 are increased. A dense layer having retention can be obtained.

  Thus, when the three-dimensional random loop bonded structure 10 is composed of a plurality of layers, each layer constituting the three-dimensional random loop bonded structure 10 can have a desired apparent density and fineness arbitrarily according to the purpose. You can choose.

  In addition, the thickness of each layer in the case where the three-dimensional random loop joint structure 10 includes a plurality of layers is not particularly limited, but is preferably 3 mm or more, and more preferably 5 mm or more. In this case, the cushioning property of the cushion 1 tends to be easily developed.

  On the outer surface of the three-dimensional random loop joint structure 10, the continuous linear body 21 that is twisted is bent at 30 ° or more, preferably 45 ° or more in the middle, and most of the contact portions between the continuous linear bodies 21 are formed. It is preferable that it is fused and substantially flattened. In this case, the contact point of the continuous linear body 21 on the outer surface of the three-dimensional random loop joint structure 10 is greatly increased to form an adhesion point. When the entire outer surface of the cushion 1 is deformed, the entire internal structure of the cushion 1 is also deformed to absorb the stress, and when the stress is released, the rubber elasticity of the continuous linear body 21 appears, and the cushion 1 Can be restored to its original form. Thereby, since the foreign body sensation cannot be given to the buttocks when sitting on the cushion 1, the sitting comfort on the cushion 1 is improved.

  When the outer surface of the three-dimensional random loop joint structure 10 is flattened, for example, the cushion 1 can be formed without using a wading layer or by stacking a very thin wading layer.

  When the outer surface of the three-dimensional random loop joint structure 10 is not substantially flattened, a local external force is applied to the outer surface of the cushion 1, and the outer surface of the three-dimensional random loop joint structure 10 is continuous. In some cases, stress concentration is selectively generated up to the bonding point portion of the linear body 21 and the continuous linear body 21, and the sag resistance of the cushion 1 may decrease due to fatigue due to the stress concentration. When the outer surface of the three-dimensional random loop bonded structure 10 is not substantially flattened, a relatively thick (preferably 10 mm or more) wadding layer is laminated, for example for a bed or a futon. A mattress can also be formed. Further, when the outer surface of the three-dimensional random loop joint structure 10 is not substantially flattened, there is a possibility that the adhesion with the wadding layer may be incomplete.

<Cushion manufacturing method>
In the following, referring to the schematic configuration diagrams of FIGS. 6 and 7, the resin portion of the three-dimensional random loop structure 10 is composed of a mixture of a high elastic thermoplastic elastomer and a high Tan δ thermoplastic elastomer. An example of a method for manufacturing the cushion 1 will be described. The three-dimensional random loop structure 10 of the cushion 1 is produced by, for example, melt spinning.

  First, as shown in FIG. 6, a high elastic modulus thermoplastic elastomer 41 and a high Tan δ thermoplastic elastomer 42 are put into an extruder 43. The mixture of the high elastic modulus thermoplastic elastomer 41 and the high Tanδ thermoplastic elastomer 42 is discharged from the extruder 43 to the discharge device 46.

  Then, a continuous linear body precursor 21a made of a mixture of a high elastic modulus thermoplastic elastomer and a high Tanδ thermoplastic elastomer 42 is discharged downward from each of the plurality of orifices 45 of the discharge device 46.

  Here, the continuous linear body precursor 21a is at a temperature 10 to 80 ° C. higher than the melting point of the high elastic modulus thermoplastic elastomer 41 and the high Tanδ thermoplastic elastomer 42 constituting the continuous linear body precursor 21a discharged from the orifice 45. Is preferably discharged.

  Further, the shape of the orifice 45 is not particularly limited, but the orifice 45 has a modified cross-section (for example, a shape in which a cross-sectional moment is increased, such as a triangle, a Y-shape, or a star-shape) or a hollow cross-section (for example, a triangular hollow, a round hollow). And a shape having a projection or the like). In this case, the continuous linear body precursor 21a in the molten state becomes difficult to flow relax, and the continuous linear body precursor 21a is maintained by keeping the flow time at the contact point of the continuous linear body precursor 21a long. The adhesion point of can be strengthened. In this case, the apparent bulk of the three-dimensional random loop joint structure 10 can be increased, the weight can be reduced, the anti-compression property can be improved, and the elasticity can be improved. Therefore, it is possible to make the cushion 1 difficult to sag.

  Further, when the orifice 45 has a hollow cross section, when the hollow ratio exceeds 80%, the hollow portion of the cross section of the continuous linear body precursor 21a is easily crushed. The hollow ratio is preferably 10% or more and 70% or less, more preferably 20% or more and 60% or less, in which the effect of weight reduction can be exhibited.

  Further, the pitch between the orifices 45 is preferably 3 mm or more and 20 mm or less, and more preferably 5 mm or more and 10 mm or less. When the pitch between the orifices 45 is 3 mm or more and 20 mm or less, particularly when the pitch is 5 mm or more and 10 mm or less, the random loops formed by the continuous linear body precursor 21a can be sufficiently brought into contact with each other. In order to make the three-dimensional random loop joint structure 10 a dense structure, a shorter pitch between the orifices 45 is preferable, and in order to make a rough structure, a longer pitch between the orifices 45 is preferable. .

  It should be noted that the three-dimensional random loop bonded structure 10 can be obtained by changing the pitch between the rows of the orifices 45 or the pitch between the holes, or by changing both the pitch between the rows and the pitch between the holes. Different apparent densities can be provided.

  Further, in the case where pressure loss at the time of discharging the continuous linear body precursor 21a is given by changing the cross-sectional area of the orifice 45, when the molten thermoplastic elastomer is discharged from the same nozzle at a constant pressure. The larger the pressure loss, the smaller the discharge amount of the continuous linear body precursor 21a. Utilizing this principle, it is possible to make the continuous linear body 21 formed by the continuous linear body precursor 21a discharged from each orifice 45 different in fineness.

  And as shown in FIG. 7, the continuous linear body precursor 21a is discharged from the some orifice 45 to the atmosphere of temperature higher than the melting | fusing point, and forms a random loop in a molten state by making it twist. The random loops are in contact with each other and fused, and are sandwiched between endless nets 55 of a pair of opposed take-up conveyors 51 and 52 provided in a cooling tank 54 in which a cooling medium 53 such as water is accommodated. The three-dimensional random loop structure 10 is obtained by being cooled in the cooling bath 54 while being pulled.

  Here, in the take-up conveyors 51 and 52, the continuous linear body precursor 21a having a twisted outer surface on both sides of the melted three-dimensional random loop structure 10 is preferably bent at 30 ° or more, more preferably 45 ° or more. The outer surface of the three-dimensional random loop structure 10 is flattened, and at the same time, the three-dimensional random loop structure 10 is formed so as to adhere at the contact point with the unbent continuous linear body precursor 21a. It is preferable.

  Then, it is preferable to perform a pseudo crystallization process by annealing the three-dimensional random loop structure 10. The annealing temperature of the three-dimensional random loop structure 10 for pseudo-crystallization treatment is not less than Tan δ α dispersion rise temperature (Tαcr) and 10 ° C. higher than the melting point (Tm) of the thermoplastic elastomer having a higher melting point. The temperature is preferably low, and more preferably (Tαcr + 10 ° C.) or more and (Tm−20 ° C.) or less. In this case, the heat resistance and sag resistance of the three-dimensional random loop structure 10 are higher than those having an endothermic peak below the melting point and not subjected to pseudo-crystallization treatment (no endothermic peak). Is significantly improved.

  Although the pseudo crystallization process can be performed simply by the annealing process, the annealing process may be performed after the three-dimensional random loop structure 10 is once cooled and then subjected to compressive deformation of 10% or more. In addition, when the drying process is performed after the three-dimensional random loop structure 10 is once cooled, the pseudo-crystallization process of the three-dimensional random loop structure 10 is performed simultaneously with the drying by setting the drying temperature to the annealing temperature. Can do. Moreover, you may perform an annealing process separately from a drying process.

  And the cushion 1 of this Embodiment is manufactured by cut | disconnecting the three-dimensional random loop structure 10 obtained by making it above into desired length and shape, and wrapping with the package 11 shown in FIG. be able to.

  When the three-dimensional random loop structure 10 is used for the cushion 1, the material of the thermoplastic elastomer, the fineness of the continuous linear body 21, the random loop 21 of the continuous linear body 21, depending on the purpose of use and the use site. The diameter, the apparent density of the three-dimensional random loop structure 10, and the like can be selected as appropriate.

  For example, when the three-dimensional random loop structure 10 is used for the wadding of the surface layer of the cushion 1, it has a low density and a small fineness in order to give a soft touch, moderate subsidence, and a tight bulge. And it is preferable to make the diameter of the small random loop 21. Further, for example, when the three-dimensional random loop structure 10 is used as a middle-layer cushion body of the cushion 1, the resonance frequency is lowered and appropriate hardness is imparted, and the hysteresis during compression is linearly changed. In order to improve body shape retention and durability, it is preferable to have a medium apparent density, a thick fineness, and a slightly larger random loop 21 diameter.

  Further, in order to match the required performance in relation to the use, it is also possible to use the three-dimensional random loop structure 10 in combination with a hard cotton cushion material made of an aggregate of short fibers such as a nonwoven fabric.

  Further, the cushion 1 is commercialized by processing the thermoplastic elastomer from the manufacturing process of the thermoplastic elastomer to the three-dimensional random loop structure 10 as long as the performance of the three-dimensional random loop structure 10 is not deteriorated, except for the manufacturing process of the thermoplastic elastomer. At any stage, the cushion 1 may be provided with functions such as flame retardancy, antibacterial and antibacterial properties, heat resistance, water and oil repellency, coloring, and fragrance by treatment such as addition of chemicals.

  The cushion 1 produced as described above may be an article that functions as a cushion other than at bedtime. Another example of the cushion 1 is illustrated in the schematic perspective view of FIG.

<Synthesis Example 1>
Dimethyl terephthalate (DMT), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG: average molecular weight 1000) were charged with a small amount of catalyst and transesterified by a conventional method. Polycondensation was performed while the temperature was reduced to produce a polyester ether block copolymer elastomer having DMT / 1,4-BD / PTMG = 100/93/7 mol%. Next, 1% of an antioxidant is added to the polyester ether block copolymer elastomer, mixed and kneaded, pelletized, and vacuum dried at a temperature of 50 ° C. for 48 hours, whereby a polyester thermoplastic elastomer raw material (A- 1) was obtained. Then, the melting point (Tm), the flexural modulus and Tanδ of the polyester thermoplastic elastomer raw material (A-1) were measured as follows. The results are shown in Table 1.

<Synthesis Example 2>
Dimethyl terephthalate (DMT), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG: average molecular weight 1000) were charged with a small amount of catalyst and transesterified by a conventional method. By polycondensation while the temperature was reduced, a polyester ether block copolymer elastomer having DMT / 1,4-BD / PTMG = 100/88/12 mol% was produced. Next, 1% of an antioxidant is added to the polyester ether block copolymer elastomer, mixed and kneaded, pelletized, and vacuum dried at a temperature of 50 ° C. for 48 hours, whereby a polyester thermoplastic elastomer raw material (A- 2) was obtained. Then, the melting point (Tm), flexural modulus and Tanδ of the polyester-based thermoplastic elastomer raw material (A-2) were measured as follows. The results are shown in Table 1.

<Synthesis Example 3>
Dimethyl terephthalate (DMT), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG: average molecular weight 1000) were charged with a small amount of catalyst and transesterified by a conventional method. Polycondensation was performed while the temperature was reduced to produce a polyester ether block copolymer elastomer having DMT / 1,4-BD / PTMG = 100/84/16 mol%. Next, 1% of an antioxidant is added to the polyester ether block copolymer elastomer, mixed and kneaded, pelletized, and vacuum dried at a temperature of 50 ° C. for 48 hours, whereby a polyester thermoplastic elastomer raw material (A- 3) was obtained. Then, the melting point (Tm), flexural modulus, and Tanδ of the polyester-based thermoplastic elastomer raw material (A-3) were measured as follows. The results are shown in Table 1.

<Synthesis Example 4>
Dimethyl terephthalate (DMT), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG: average molecular weight 1000) were charged with a small amount of catalyst and transesterified by a conventional method. Polycondensation was performed while the temperature was reduced to produce a polyester ether block copolymer elastomer having DMT / 1,4-BD / PTMG = 100/72/28 mol%. Next, 1% of an antioxidant is added to the polyester ether block copolymer elastomer, mixed and kneaded, pelletized, and vacuum dried at a temperature of 50 ° C. for 48 hours, whereby a polyester thermoplastic elastomer raw material (A- 4) was obtained. Then, the melting point (Tm), the flexural modulus and Tanδ of the polyester thermoplastic elastomer raw material (A-4) were measured as follows. The results are shown in Table 1.

<Synthesis Example 5>
Dimethyl terephthalate (DMT), dimethyl isophthalate (DMI), 1,4-butanediol (1,4-BD), and polytetramethylene glycol (PTMG: average molecular weight 1000) are charged with a small amount of catalyst. After transesterification by the method, a polyester ether block copolymer elastomer having DMT / DMI / 1,4-BD / PTMG = 75/25/92/8 mol% was produced by polycondensation while raising the temperature and reducing the pressure. Next, 1% of an antioxidant is added to the polyester ether block copolymer elastomer, mixed and kneaded, pelletized, and vacuum dried at a temperature of 50 ° C. for 48 hours, whereby a polyester thermoplastic elastomer raw material (A- 5) was obtained. Then, the melting point (Tm), the flexural modulus and Tanδ of the polyester thermoplastic elastomer raw material (A-5) were measured as follows. The results are shown in Table 1.

<Method for measuring properties of thermoplastic elastomer>
(1) Melting point (Tm)
Using the TA50 and DSC50 differential thermal analyzers manufactured by Shimadzu Corporation, the endothermic peak (melting peak) temperature was determined from the endothermic curve obtained by measuring a 10 g sample from 20 ° C to 250 ° C at a rate of temperature increase of 20 ° C / min. By determining, the melting point (Tm) of the polyester-based thermoplastic elastomer raw material was measured.

(2) Flexural modulus A test piece having a length of 125 mm, a width of 12 mm, and a thickness of 6 mm was prepared by an injection molding machine, and the flexural modulus of the polyester-based thermoplastic elastomer raw material was measured according to the ASTM D790 standard.

(3) Tanδ
A sheet sample having a thickness of 300 μm was formed by a heat press at a set temperature of 230 ° C., and measured using a dynamic viscoelasticity measuring device (UBE Rheogel-E-4000) at a frequency of 11 Hz and a heating rate of 2 ° C./min. The Tan δ (ratio E ″ / E ′ ratio between the loss elastic modulus E ″ and the storage elastic modulus E ′) at 23 ° C. was measured.

<Example 1>
Thermoplastic elastomer (70 kg of polyester-based thermoplastic elastomer (A-2) obtained in Synthesis Example 2 and 30 kg of hydrogenated styrene-butadiene random copolymer (SBR) (“SOE” manufactured by Asahi Kasei Chemicals Corporation) S1611 ")), 1 kg of a trimet acid ester plasticizer (DIC," Monocizer W705 "), 10 kg of a polyester plasticizer (DIC," Polysizer A55 "), 0.25 kg of a hindered phenol Antioxidant (“ADEKA STAB AO330” manufactured by ADEKA) and 0.25 kg phosphorous antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) were mixed in a tumbler for 5 minutes, and then a twin screw extruder having a screw diameter of φ57 mm. Melt and knead at a cylinder temperature of 220 ° C and a screw speed of 130 rpm, and put in a water bath After extruded cooling to Portland shape to obtain pellets of the resin composition. From the nozzle obtained by arranging the obtained resin composition on a nozzle effective surface of width 65 cm × length 5 cm and round hollow orifices having a hole diameter of 3.0 mm at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction At 240 ° C. with a single-hole discharge rate of 2.5 g / min, and toward the cooling water surface below the nozzle surface 30 cm, the polyester-based thermoplastic elastomer (A-1) and hydrogenated styrene-butadiene random copolymer The continuous linear body precursor which consists of a mixture with coalescence (SBR) was discharged.

  Then, the continuous linear body precursor discharged from the nozzle was taken up by a stainless steel endless net having a width of 70 cm provided on a pair of take-up conveyors partially exposed above the water surface. Here, the stainless steel endless nets are provided in each of the pair of take-up conveyors, and are arranged so as to face each other and be spaced in parallel by 5 cm.

  Random loops are formed in the continuous linear precursors that are taken up by the endless net made of stainless steel, and the random loops of the continuous linear precursors are brought into contact with each other in a molten state. A three-dimensional random loop bonded structure was formed by fusing.

  The outer surfaces on both sides of the three-dimensional random loop bonded structure thus formed were sandwiched between stainless endless nets and drawn into 25 ° C. cooling water at a rate of 1 m / min and solidified.

  Then, the three-dimensional random loop bonded structure drawn out from the cooling water was subjected to pseudo crystallization treatment by drying and heating in a hot air dryer at 100 ° C. for 15 minutes, and then cut into a predetermined size. For the three-dimensional random loop joined structure thus obtained, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tanδ of the continuous linear body, the three-dimensional random loop The apparent density of the bonded structure and the hardness at 25% compression of the three-dimensional random loop bonded structure were measured.

<Method for measuring characteristics of three-dimensional random loop bonded structure>
(1) Hollow ratio of continuous linear body (%)
A continuous linear body is taken from a three-dimensional random loop bonded structure, cooled with liquid nitrogen, cut, and the cut surface is observed with an electron microscope at a magnification of 50 times, and the obtained image is analyzed with a CAD system. Then, the cross-sectional area (A) of the continuous linear body and the cross-sectional area (B) of the hollow portion were measured, and the hollow ratio (%) was calculated by the formula {B / (A + B)} × 100.

(2) Fineness of continuous linear body (decitex)
The three-dimensional random loop bonded structure was cut into a size of 20 cm wide × 20 cm long, and continuous linear bodies were collected from 10 locations. The specific gravity of continuous linear bodies collected from 10 locations was measured using a density gradient tube. Furthermore, the cross-sectional area of the continuous linear body collected at the 10 locations was determined from a photograph enlarged with a microscope, and the volume corresponding to a length of 10,000 m of the continuous linear body was determined from the cross-sectional area. The value obtained by multiplying the specific gravity and volume obtained as described above was defined as the fineness (weight of continuous linear body 10000 m) (average value of n = 10).

(3) Tanδ of continuous linear body
A three-dimensional random loop bonded structure was formed into a sheet sample having a thickness of 300 μm by a heat press at a setting temperature of 230 ° C., and the frequency was increased to 11 Hz using a dynamic viscoelasticity measuring device (UBE Rheogel-E-4000). The value of Tan δ (the ratio E ″ / E ′ between the loss elastic modulus E ″ and the storage elastic modulus E ′) measured at a temperature rate of 2 ° C./min was used.

(4) Apparent density (g / cm ³ ) of three-dimensional random loop bonded structure
The three-dimensional random loop joint structure is cut into a size of 15 cm wide × 15 cm long, the height of four locations is measured, the volume is obtained, and the weight of the three-dimensional random loop joint structure is calculated by volume. (Average value of n = 4).

(5) 25% compression hardness of the three-dimensional random loop joint structure (kg / Φ200)
A three-dimensional random loop bonded structure is cut to a size of 30 cm wide × 30 cm long, a sample is cut to a size of 30 cm × 30 cm, and compressed to 75% with a Φ200 mm compression plate using Tensilon manufactured by Orientec. The stress at the time of 25% compression of the obtained stress-strain curve was calculated (average value of n = 3).

Further, the three-dimensional random loop bonded structure having an apparent density of 0.04 to 0.05 g / cm ³ produced as described above was cut into a size of 50 cm wide × 50 cm long × 5 cm thick, and a cloth cover Cushioning and quietness were measured as follows for the cushion produced by coating with. The results are shown in Table 2.

(6) Cushioning and quietness 30 panelists in the body weight range of 40-100 kg (20-39-year-old male; 5, 20-39-year-old female: 5, 40-59-year-old male: 5 people, women aged 40 to 59 years: 5 people, men aged 60 to 80 years: 5 people, women aged 60 to 80 years: 5 people) sit on the cushion made as described above The degree of feeling when hitting the floor (cushioning) and the sound generated (silence) was qualitatively evaluated according to the following classification.
A: I don't feel B: I almost don't feel C: I feel a little D: I feel

<Example 2>
The thermoplastic elastomer was 80 kg of the polyester-based thermoplastic elastomer (A-2) obtained in Synthesis Example 2 and 20 kg of hydrogenated styrene-butadiene random copolymer (SBR) (“SO” manufactured by Asahi Kasei Chemicals Corporation). E.S1611 "), the orifice is a round solid shape with a hole diameter of 1.0 mm, and the single hole discharge rate during discharge is 2.0 g / min. The three-dimensional random loop structure and cushion of Example 2 were produced. About the three-dimensional random loop joint structure and cushion of Example 2, in the same manner as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tanδ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Example 3>
The thermoplastic elastomer was 80 kg of the polyester-based thermoplastic elastomer (A-2) obtained in Synthesis Example 2 and 20 kg of hydrogenated styrene-butadiene random copolymer (SBR) (“SO” manufactured by Asahi Kasei Chemicals Corporation). E. S1611 "), a three-dimensional random loop structure and a cushion of Example 3 were produced in the same manner as in Example 1. About the three-dimensional random loop joint structure and cushion of Example 3, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Example 4>
The thermoplastic elastomer is 30 kg of the polyester thermoplastic elastomer (A-1) obtained in Synthesis Example 1, 40 kg of the polyester thermoplastic elastomer (A-5) obtained in Synthesis Example 5, and 30 kg of water. Styrene-butadiene random copolymer (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals Corporation) with a round solid shape with an orifice of 1.0 mm, and single-hole discharge during discharge A three-dimensional random loop structure and a cushion of Example 4 were produced in the same manner as in Example 1 except that the amount was 2.0 g / min. About the three-dimensional random loop joint structure and cushion of Example 4, in the same manner as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tanδ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Example 5>
The thermoplastic elastomer is 30 kg of the polyester thermoplastic elastomer (A-1) obtained in Synthesis Example 1, 40 kg of the polyester thermoplastic elastomer (A-5) obtained in Synthesis Example 5, and 30 kg of water. The three-dimensional random loop structure of Example 5 was the same as Example 1 except that it was a styrene-butadiene random copolymer (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals Corporation). A cushion was made. About the three-dimensional random loop joint structure and cushion of Example 5, as in Example 1, the hollow ratio of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Example 6>
The thermoplastic elastomer is 20 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1, 60 kg of the polyester-based thermoplastic elastomer (A-5) obtained in Synthesis Example 5, and 20 kg of water. The three-dimensional random loop structure of Example 6 was the same as Example 1 except that it was a styrene-butadiene random copolymer (SBR) ("SOE S1611" manufactured by Asahi Kasei Chemicals Corporation). A cushion was made. About the three-dimensional random loop joint structure and cushion of Example 6, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tanδ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Example 7>
A thermoplastic elastomer (100 kg of the polyester-based thermoplastic elastomer (A-5) obtained in Synthesis Example 5) and 0.25 kg of a phosphorous antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) for 5 minutes. A three-dimensional random loop structure and a cushion of Example 7 were produced in the same manner as Example 1 except for the mixed points. About the three-dimensional random loop joint structure and cushion of Example 7, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Comparative Example 1>
Thermoplastic elastomer (100 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1) and 0.25 kg of a hindered phenol antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg A three-dimensional random loop structure and a cushion of Comparative Example 1 were prepared in the same manner as in Example 1 except that the phosphorus antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) was mixed for 5 minutes with a tumbler. For the three-dimensional random loop joint structure and cushion of Comparative Example 1, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Comparative example 2>
Thermoplastic elastomer (100 kg of polyester-based thermoplastic elastomer (A-2) obtained in Synthesis Example 2) and 0.25 kg of hindered phenol-based antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg A three-dimensional random loop structure and a cushion of Comparative Example 2 were produced in the same manner as in Example 1 except that the phosphoric antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) was mixed in a tumbler for 5 minutes. For the three-dimensional random loop joint structure and cushion of Comparative Example 2, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Comparative Example 3>
Thermoplastic elastomer (100 kg of polyester-based thermoplastic elastomer (A-3) obtained in Synthesis Example 3) and 0.25 kg of hindered phenolic antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg A three-dimensional random loop structure and a cushion of Comparative Example 3 were produced in the same manner as in Example 1 except that the phosphorus antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) was mixed for 5 minutes with a tumbler. For the three-dimensional random loop joint structure and cushion of Comparative Example 3, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tanδ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Comparative example 4>
Thermoplastic elastomer (100 kg of polyester-based thermoplastic elastomer (A-4) obtained in Synthesis Example 4) and 0.25 kg of hindered phenol-based antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg A three-dimensional random loop structure and a cushion of Comparative Example 4 were produced in the same manner as in Example 1 except that the phosphorus antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) was mixed for 5 minutes with a tumbler. For the three-dimensional random loop joint structure and cushion of Comparative Example 4, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

<Comparative Example 5>
Thermoplastic elastomer (100 kg of polyester-based thermoplastic elastomer (A-5) obtained in Synthesis Example 5) and 0.25 kg of hindered phenolic antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg A three-dimensional random loop structure and a cushion of Comparative Example 5 were produced in the same manner as in Example 1 except that the phosphorus antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) was mixed for 5 minutes with a tumbler. For the three-dimensional random loop joint structure and cushion of Comparative Example 5, as in Example 1, the hollowness of the continuous linear body, the fineness of the continuous linear body, Tan δ of the continuous linear body, and the three-dimensional random loop joint The apparent density of the structure, the hardness at 25% compression, the cushioning property, and the quietness of the three-dimensional random loop joint structure were measured. The results are shown in Table 2.

  As shown in Table 2, a continuous loop of 100 to 100,000 decitex composite-structured with a thermoplastic elastomer is twisted to form a random loop, and the respective loops are brought into contact with each other in a molten state. The three-dimensional random loop joint structure formed by fusing most of the three-dimensional random loop joint structure is wrapped with a cloth cover, and Tanδ at 23 ° C. of the continuous linear body is 0.10 or more. It was confirmed that the cushions of Examples 1 to 7 having a% compression hardness of 10 kg / Φ200 or more are superior in cushioning and quietness as compared to the cushions of Comparative Examples 1 to 5.

  The present invention can be used for a cushion used in daily life other than at bedtime.

  DESCRIPTION OF SYMBOLS 1 Cushion, 10 3D random loop joining structure, 11 Packaging body, 21 Continuous linear body, 21a Continuous linear body precursor, 22 Random loop, 33 Hollow part, 41 High elastic modulus thermoplastic elastomer, 42 High Tanδ heat Plastic elastomer, 43 extruder, 45 orifice, 46 discharge device, 51, 52 take-up conveyor, 53 cooling medium, 54 cooling tank, 55 endless net.

Claims (6)

A three-dimensional random loop joining structure formed by winding a continuous linear body of 100 to 100,000 decitex to form a random loop, bringing the respective loops into contact with each other in a molten state, and fusing most of the contact portions; ,
A package that wraps around the three-dimensional random loop joint structure,
Tan δ at 23 ° C. of the continuous linear body is 0.10 or more,
The cushion whose 25% compression hardness of the three-dimensional random loop joint structure is 10 kg / Φ200 or more.   The cushion according to claim 1, wherein the continuous linear body is made of a thermoplastic elastomer.   The cushion according to claim 2, wherein the continuous linear body is composed of a mixture of two or more different thermoplastic elastomers.   The cushion according to claim 3, wherein at least one of the thermoplastic elastomers is a polyester-based thermoplastic elastomer.   The cushion according to any one of claims 1 to 4, wherein the continuous linear body has a hollow cross section.   The cushion according to any one of claims 1 to 4, wherein the continuous linear body has an irregular cross section.

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