JP2013075138A - Elastic net-like structure excellent in stillness and hardness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic net-like structure excellent in the cushionability with reduced noise when the structure is compressed or recovered.SOLUTION: The net-like structure is formed of a three-dimensional random loop joint structure formed by forming random loops with winding continuous linear bodies of 100-100,000 decitex, bringing the respective loops in a fused state into contact with each other, and fusing most of the contact parts. Tanδ of the continuous linear body at the temperature of 23°C measured by a dynamic viscoelasticity measuring device is at least 0.10, and the hardness of the three-dimensional random loop joint structure when compressed by 25% is at least 10 kg/Φ200 mm.

Description

  The present invention relates to an elastic network structure composed of a continuous linear three-dimensional random loop joint structure.

  A three-dimensional random structure in which a continuous linear body made of polyester copolymer thermoplastic elastic resin is twisted to form a random loop, and the respective loops are brought into contact with each other in a molten state, and most of the contact portion is fused. A loop joint structure has been proposed (Patent Document 1). However, there is a problem that when used for bedding, there is a problem that it is loud and difficult to sleep because a sound such that the random loops are rubbed at the time of compression and recovery or a sound that the random loops are repelled.

In contrast, a continuous linear body having a fineness of 300 dtex or more made of a polyester copolymer is twisted to form a random loop, and the respective loops are brought into contact with each other in a molten state, and most of the contact portion is fused. A cushioning material has been proposed in which a polyester resin is adhered to the surface of a random loop of a three-dimensional random loop joint structure formed (Patent Document 2). Although the sound of rubbing between random loops during compression and recovery was reduced, the sound of rubbing between random loops was still sounding, and there was room for improvement in terms of quietness. Further, the process of attaching the polyester-based resin to the surface of the random loop is a separate process from the three-dimensional random loop bonded structure, and has a problem in terms of manufacturing because it is a batch formulation.

JP 7-68061 A JP 2010-43376 A

  An object of the present invention is to provide an elastic network structure having excellent cushioning properties and reduced sound during compression and recovery.

  If the present inventors are a three-dimensional random loop junction structure composed of a continuous linear body having high vibration damping properties, a network structure with reduced sound during compression and recovery such as repelling sound and rubbing sound I found out that However, increasing the vibration damping property is proportional to the decrease in elasticity, resulting in a so-called soft network structure, resulting in a loss of cushioning properties.

Thus, as a result of further intensive studies by the present inventors, a net-like structure having reduced sound generated during compression and recovery while ensuring elasticity was found, and the present invention was achieved.

That is, this invention consists of the following structures.
(Claim 1)
From a three-dimensional random loop bonded 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 The tan δ at 23 ° C. measured using a continuous linear dynamic viscoelasticity measuring apparatus is 0.10 or more, and the three-dimensional random loop bonded structure is compressed by 25%. A network structure having an hour hardness of 10 kg / Φ200 mm or more.
(Section 2)
Item 2. The network structure according to Item 1, wherein the continuous linear material is composed of a mixture of two or more different thermoplastic elastomers (Item 3).
Item 3. The network structure according to Item 1 or 2, wherein at least one of two or more different thermoplastic elastomers is a polyester-based thermoplastic elastomer.
(Claim 4)
Item 4. The network structure according to Item 3, wherein the polyester-based thermoplastic elastomer is a polyester ether block copolymer or a polyester ester block copolymer.
(Section 5)
Item 5. The network structure according to Item 3 or 4, wherein at least one of two or more different thermoplastic elastomers is a polyester-based thermoplastic elastomer, and at least one is a polystyrene-based thermoplastic elastomer.
(Claim 6)
Item 6. The network according to Item 5, wherein the polystyrene-based thermoplastic elastomer is at least one selected from the group consisting of a styrene-butadiene random copolymer, a styrene-isoprene random copolymer, and a hydrogenated copolymer thereof. Structure.
(Claim 7)
Item 7. The network structure according to any one of Items 1 to 6, wherein the continuous linear body has a hollow cross section.
(Section 8)
Item 7. The network structure according to any one of Items 1 to 6, wherein the continuous linear body has an irregular cross section.

In the conventional network structure, the sound of rubbing between random loops and the sound of repelling random loops were generated during compression and recovery, but the network structure of the present invention greatly reduces the noise. It has an excellent effect in that the elasticity at the time of compression is kept at the same level as that of the conventional network structure.

The network structure of the present invention comprises a continuous filament having a fineness of 100 to 100,000 dtex (in this specification, sometimes referred to as “continuous filament”), and the filaments are brought into contact with each other, The contact portion is fused to form a three-dimensional network structure. As a result, even when a large deformation is caused by a very large stress, the entire network structure composed of the fused three-dimensional random loop is deformed to absorb the stress, and when the stress is released, the thermoplastic elastomer Rubber elasticity develops and the structure can recover to its original form. In addition, it is preferable that the linear fineness which forms the network structure of this invention is 100-100000 decitex. Less than 100 dtex is not preferable because the anti-compression strength is lowered and the repulsive force is lowered. Above 100,000 decitex, the individual bodies have a large anti-compressibility, but the number of components decreases, so that the dispersion of force is worsened. Therefore, when a remarkably large compressive force of 100 kg / cm @ 2 or more is applied, a sag due to stress concentration (compression set) may occur, and the use portion may be limited. More preferably, it is 300-50000 decitex, More preferably, it is 500-30000 decitex. In the present invention, not only a continuous linear body composed of single fine filaments but also filaments having different finenesses can be used to obtain an optimum configuration in combination with the apparent density.

The continuous linear body forming the network structure of the present invention preferably has a Tan δ at 23 ° C. of 0.10 or more measured using a dynamic viscoelasticity measuring apparatus. Tanδ (tangent delta) is a ratio E ″ / E ′ of loss elastic modulus E ″ and storage elastic modulus E ′ measured using a dynamic viscoelasticity measuring device. Increases, and the effect of reducing vibration noise increases. If Tan δ at 23 ° C. is less than 0.10, vibration noise due to the random loop bounce when the network structure is compressed or recovered cannot be sufficiently reduced, which is not preferable. More preferably, it is 0.12 or more, More preferably, it is 0.15 or more. Moreover, it is particularly preferable that Tan δ measured using a dynamic viscoelasticity measuring device satisfies 0.10 or more in the entire range of 0 ° C to 23 ° C. Thereby, silence can be maintained in a wide temperature range. On the other hand, the upper limit is not particularly defined, but is preferably 1.0 or less, more preferably 0.8 or less, and particularly preferably 0.5 or less. If it is 1.0 or more, it is not preferable from the viewpoint of cushioning properties.

The 25% compression hardness of the network structure of the present invention is preferably 10 kg / Φ200 mm or more. The hardness at 25% compression is the stress at the time of 25% compression of the stress-strain curve obtained by compressing the network structure to 75% with a circular compression plate having a diameter of 200 mm. If the hardness at 25% compression is less than 10 kg / Φ200 mm, sufficient elasticity cannot be obtained, and comfortable cushioning properties are impaired. More preferably, it is 15 kg / Φ200 mm or more, and particularly preferably 20 kg / Φ200 mm or more. The upper limit is not particularly defined, but is preferably 50 kg / Φ200 mm or less, more preferably 45 kg / Φ200 mm or less, and particularly preferably 40 kg / Φ200 mm or less. If it is 50 kg / Φ200 mm or more, it becomes too hard, which is not preferable from the viewpoint of cushioning properties.

The resin portion of the continuous filaments constituting the network structure of the present invention is preferably composed 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. Dicarboxylic acids selected from aromatic dicarboxylic acids, alicyclic dicarboxylic acids such as 1,4 cyclohexane dicarboxylic acid, aliphatic dicarboxylic acids such as succinic acid, adipic acid, and sebacic acid dimer acid, or ester-forming derivatives thereof. At least one kind of acid and aliphatic diols such as 1,4 butanediol, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, 1,1 cyclohexanedimethanol, 1,4 cyclohexanedimethanol Alicyclic dio such as Or at least one diol component selected from these ester-forming derivatives and the like, and polyethylene glycol, polypropylene glycol, polytetramethylene glycol, or ethylene oxide-propylene oxide copolymer having an average molecular weight of about 300 to 5000 It is a ternary block copolymer composed of at least one selected polyalkylenediol. 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, polyalkylenediol as diol component Terephthalic acid or / and naphthalene-2 · 6-dicarboxylic acid as a dicarboxylic acid, 1.4 butanediol as a diol component, and polylactone as a polyester diol A ternary block copolymer consisting of 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 (B), a conventionally known polyisocyanate can be used, but an isocyanate mainly composed of diphenylmethane 4, 4 ′ diisocyanate is used, and if necessary, a conventionally known triisocyanate or the like is added in a small amount. May be. As the polyamine (C), known diamines such as ethylene diamine and 1,2 propylene diamine are mainly used, and a trace amount of triamine and tetraamine may be used in combination as necessary. 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.

It is preferable that the resin portion of the continuous filaments constituting the network structure of the present invention is composed of a mixture of two or more different thermoplastic elastomers. Increasing Tan δ of the continuous linear body and increasing the hardness of the network structure at 25% compression generally have a trade-off relationship. That is, if Tanδ of the continuous linear body is increased, the hardness at the time of 25% compression is decreased, and Tanδ is decreased when the hardness of the continuous linear body at the time of 25% compression is increased. In the present invention, the two- or more kinds of different thermoplastic elastomers are used to complement each other, so that both the size of Tan δ and the hardness of 25% compression are compatible, that is, excellent in cushioning properties and high in quietness. A structure is obtained. In an embodiment of the present invention, 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.

  Various additives can be blended in the resin portion of the continuous filaments constituting the network structure of the present invention 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 filaments constituting the network structure of the present invention preferably has an endothermic peak below the melting point in the melting curve measured with a differential scanning calorimeter. Those having an endothermic peak below the melting point have significantly improved heat sag resistance than those having no endothermic peak. For example, as a preferable polyester-based thermoplastic elastomer of the present invention, terephthalic acid or naphthalene 2,6-dicarboxylic acid having a rigid hard segment acid component is 90 mol% or more, more preferably 95 mol% or more, particularly preferably. After the transesterification of the glycol component and the component containing 100 mol%, the polymer is polymerized to the required degree of polymerization, and then the polyalkylene diol is preferably a polyalkylene diol having an average molecular weight of 500 or more and 5000 or less, more preferably 1000 or more and 3000 or less. When tetramethylene glycol is copolymerized in an amount of 10 wt% to 70 wt%, more preferably 20 wt% to 60 wt%, terephthalic acid or naphthalene 2.6 dicarboxylic acid having a rigid hard segment acid component When there is much content of hard, crystallinity of hard segment improves , Hardly plastically deformed, and to improve the sexual sag resistant anti. In addition, if the annealing treatment is further performed at a temperature lower than the melting point by at least 10 ° C. after the fusion bonding, the heat resistance and sag resistance is further improved. Heat annealing resistance is further improved by annealing after applying compressive strain. The filaments of the network structure subjected to such treatment more clearly express an endothermic peak at a temperature not lower than the melting point and not higher than the melting point in the melting curve measured by a differential scanning calorimeter (DSC). When annealing is not performed, the endothermic peak does not appear in the melting curve above the room temperature and below the melting point. By analogy with this, it is considered that the hard segments are rearranged by annealing and pseudo-crystallization-like cross-linking points are formed, and the heat resistance and sag resistance are improved. (Hereinafter, this annealing treatment may be referred to as “pseudo crystallization treatment.”) This pseudo crystallization treatment effect is also effective for polyamide thermoplastic elastomers and polyurethane thermoplastic elastomers.

The cross-sectional shape is not particularly limited, but it is particularly preferable when the hollow cross-section or the irregular cross-section can be imparted with an anti-compression property and bulkiness and it is desired to reduce the fineness. The compressibility can be adjusted according to the modulus of the material used, and the softness of the material can increase the hollowness and the degree of deformation to adjust the gradient of the initial compressive stress. Gives comfort and good compressibility. As another effect of the hollow cross section and the modified cross section, by increasing the hollow ratio and the deformity, when the same anti-compression property is given, the weight can be further reduced.

Specific embodiments of the network structure of the present invention, the preferred range of the average apparent density is not more than 0.005 g / cm ³ or more 0.20 g / cm ³ which functions as a cushion material can be expressed. If it is less than 0.005 g / cm ³ , the repulsive force is lost, so it is unsuitable for a cushioning material. If it exceeds 0.20 g / cm ³ , the repulsive force is too high and the seating comfort is deteriorated. More preferred apparent density of the present invention is ^{0.01g / cm 3 ~0.10g / cm 3} , more preferable range is ^{0.03g / cm 3 ~0.06g / cm 3} . The network structure of the present invention can be provided with preferable characteristics by laminating a plurality of layers composed of filaments having different finenesses and changing the apparent density of each layer. For example, if the surface layer is composed of a fine surface layer and a thick basic layer, the density of the surface layer is slightly increased to increase the number of components, and the stress applied to one of the filaments is decreased to improve the stress distribution. In addition, it is possible to improve the sitting comfort by improving the cushioning property that supports the buttocks. Since the basic layer is thicker and slightly harder, and is a denser layer that is responsible for vibration absorption and body shape retention, the basic layer can have a slightly finer filament and a higher density. As a result, vibrations and repulsive stresses received from the seat frame surface are uniformly transmitted to the basic layer so that the whole can be deformed and converted into energy, thereby improving the sitting comfort and improving the durability of the cushion. Furthermore, in order to give the seat side thickness and tension, the fineness can be partially reduced to increase the density. Thus, each layer can arbitrarily select a preferable density and fineness according to the purpose. The thickness of each layer of the network structure is not particularly limited, but is preferably 3 mm or more, and more preferably 5 mm or more, because the function as a cushion body is easily exhibited.

The outer surface of the structure of the net-like structure has a curved surface that is bent 30 ° or more, preferably 45 ° or more in the middle, and is substantially flattened, and most of the contact portion is fused. It is preferable to have a surface layer part. As a result, the contact points of the filaments on the surface of the network structure are greatly increased to form adhesion points, so that the local external force of the buttocks when sitting is received on the structure surface without giving a sense of foreign matter to the buttocks. The surface structure is deformed as a whole, the entire internal structure is also deformed to absorb the stress, and when the stress is released, the elastic elasticity of the elastic resin appears and the structure is restored to its original form. Can do. If it is not substantially flattened, it gives a feeling of foreign matter to the buttocks, local external force is applied to the surface, and stress concentration may occur selectively up to the surface stripes and adhesion points. There is a case where fatigue due to concentration occurs and the sag resistance decreases. When the outer surface of the structure is flattened, do not use a wading layer or laminate a very thin wading layer and cover the surface with the side ground, for seats or chairs or beds for automobiles, railways, etc., for sofas, It can be used as a cushion mat for futons. If the outer surface of the structure is not flattened, a relatively thick (preferably 10 mm or more) wadding layer needs to be laminated on the surface of the network structure, and the seat and cushion mat must be formed by covering the surface with the side ground. . If necessary, adhesion to the wadding layer or adhesion to the side is easy when the surface is flat, but when the surface is not flattened, the adhesion is incomplete and uneven.

Next, although the manufacturing method of the network structure which consists of a three-dimensional random loop junction structure of this invention is described below, the following method is an example and is not limited to this.
First, using a general melt extruder, the thermoplastic elastomer is heated to a temperature 10 to 80 ° C. higher than the melting point to be in a molten state, discharged downward from a nozzle having a plurality of orifices, and naturally lowered to form a loop. . At this time, the loop diameter and the fineness of the linear body are determined by the distance between the nozzle surface and the take-up conveyor installed on the cooling medium for solidifying the resin, the melt viscosity of the resin, the orifice diameter and the discharge amount, and the like. A pair of take-up conveyors that can be adjusted on the cooling medium can be adjusted so that a molten discharge linear body is sandwiched and stopped to generate a loop, and the hole interval of the orifice is set to a hole interval at which the generated loop can contact. The generated loops are brought into contact with each other, and the contact portions are fused while the loops form a random three-dimensional form. Next, the continuous linear body in which the contact portion is fused while continuously forming a random three-dimensional form is continuously drawn into the cooling medium and solidified to form a network structure.

The shape of the orifice is not particularly limited, but may be an irregular cross-section (for example, a triangle, Y-type, star-shaped, etc. with a high secondary cross-section moment) or a hollow cross-section (for example, a triangular hollow, a round hollow, a hollow with protrusions, etc.) It is particularly preferable that the three-dimensional structure formed by the melted discharge filaments is difficult to flow relax, and conversely the flow time at the contact point can be kept long to strengthen the adhesion point. In the case of heating for adhesion described in JP-A-1-2075, the three-dimensional structure is easy to relax, and a planar structure is formed, making it difficult to form a three-dimensional structure. As an effect of improving the characteristics of the structure, the apparent bulk can be increased, the weight can be reduced, the anti-compression property can be improved, the elasticity can be improved, and the structure cannot be easily set. Since the cross section tends to be crushed when the hollow ratio exceeds 80% in the hollow cross section, the hollow ratio in the case of employing the hollow cross section is preferably 10% or more and 70% or less, more preferably 20%, at which the effect of weight reduction can be exhibited. It is 60% or less.

The pitch between the holes of the orifices needs to be a pitch that can sufficiently contact the loop formed by the linear shape. The pitch between holes is shortened to obtain a dense structure, and the pitch between holes is increased to obtain a dense structure. The pitch between holes of the present invention is preferably 3 mm to 20 mm, more preferably 5 mm to 10 mm. In the present invention, different density and different fineness can be achieved as desired. The different density layer can be formed by a configuration in which the pitch between rows or the pitch between holes is changed, and a method in which both the pitch between rows and between holes are also changed. In addition, when changing the cross-sectional area of the orifice to give a pressure loss difference at the time of discharge, using the principle that the amount of discharge by which the molten thermoplastic elastomer is pushed out from the same nozzle at a constant pressure becomes smaller as the orifice has a larger pressure loss, Different fineness can be achieved.

Next, both outer surfaces of the melted three-dimensional structure are sandwiched by a take-off net, and the twisted discharge filaments on both surfaces are bent and deformed by 30 ° or more, and the surface is flattened and not bent at the same time. A structure is formed by adhering contact points with the discharge filaments. After that, the network structure comprising the three-dimensional random loop joint structure of the present invention is continuously cooled rapidly with a cooling medium (usually room temperature water is preferable because the cooling rate can be increased and the cost is reduced). Get the body. Next, draining and drying are performed. However, adding a surfactant or the like to the cooling medium is not preferable because draining or drying becomes difficult and the thermoplastic elastomer may swell. As a preferred method of the present invention, a pseudo crystallization treatment is performed after cooling. The pseudo-crystallization temperature is at least 10 ° C. lower than the melting point (Tm) and is equal to or higher than the Tan dispersion α dispersion rising temperature (Tαcr). With this treatment, the heat sag resistance is remarkably improved as compared with those having an endothermic peak below the melting point and not subjected to pseudo-crystallization treatment (no endothermic peak). The preferred pseudocrystallization temperature of the present invention is from (Tαcr + 10 ° C.) to (Tm−20 ° C.). When pseudo-crystallization is performed by simple heat treatment, heat sag resistance is improved. Furthermore, after cooling, it is more preferable to apply 10% or more of compressive deformation and perform annealing so that the heat sag resistance is remarkably improved. Moreover, when it passes through a drying process once after cooling, a pseudo crystallization process can be performed simultaneously by making drying temperature into annealing temperature. In addition, a pseudo crystallization process can be performed separately.

Next, it is cut into a desired length or shape and used as a cushioning material. When the network structure of the present invention is used for a cushioning material, it is necessary to select a resin, a fineness, a loop diameter, and a bulk density to be used depending on the purpose of use and the use site. For example, when used for surface wading, it is preferable to have a low density, fine fineness, and a fine loop diameter in order to give a soft touch, moderate subsidence, and a tight bulge. In order to lower the resonant frequency, linearly change the appropriate hardness and hysteresis at the time of compression, improve the body shape retention, and maintain durability, medium density, thick fineness, slightly larger The diameter is preferable. Of course, it can be used in combination with other materials such as a hard cotton cushion material made of short fiber aggregates, non-woven fabric, etc. to meet the required performance in relation to the application. In addition, it can be processed into a molded product from the manufacturing process as long as the performance is not deteriorated even outside the resin manufacturing process, and flame retardant, antibacterial, heat resistance, water and oil repellency, coloring, fragrance, etc. It is possible to perform processing such as adding a drug to impart the function.

The present invention is described in detail below with reference to examples.
In addition, evaluation in an Example was performed with the following method.

<Resin characteristics>
・ Melting point (Tm)
Using a Shimadzu TA50, DSC50 differential thermal analyzer, an endothermic peak (melting peak) temperature was determined from an 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.
-Flexural modulus Test pieces having a length of 125 mm, a width of 12 mm and a thickness of 6 mm were prepared by an injection molding machine, and measured according to the ASTM D790 standard.
・ Tanδ of raw material resin
The sample used for the measurement was formed into a sheet sample having a thickness of 300 μm by a heat press at a set temperature of 230 ° C. and cut into a length of 23 mm and a width of 5 mm. Using a dynamic viscoelasticity measuring device (Rhegel-E-4000 manufactured by UBM), the 4 mm portions at both ends of the long side of the sample were each fixed with a tensile jig, and measured at 11 Hz and a heating rate of 2 ° C./min. Tanδ (ratio E ″ / E ′ of loss elastic modulus E ″ and storage elastic modulus E ′) was used.

<Network structure characteristics>
(1) Tanδ of continuous striatum
The sample used for the measurement was formed by forming a network structure into a sheet sample having a thickness of 300 μm by a heat press at a set temperature of 230 ° C., and cutting it into a length of 23 mm × a width of 5 mm. Using a dynamic viscoelasticity measuring device (Rhegel-E-4000 manufactured by UBM), the 4 mm portions at both ends of the long side of the sample were each fixed with a tensile jig, and measured at 11 Hz and a heating rate of 2 ° C./min. Tanδ (ratio E ″ / E ′ of loss elastic modulus E ″ and storage elastic modulus E ′) was used.
(2) 25% compression hardness The sample was cut into a size of 30 cm × 30 cm, and the stress-strain curve obtained by compressing to 75% with a φ200 mm compression plate using Tensilon manufactured by Orientec Corp. Indicated by stress. (Average value of n = 3)
(3) Apparent density A sample is cut into a size of 15 cm × 15 cm, the heights at four locations are measured, the volume is determined, and the weight of the sample is expressed as a value (g / cm ³ ) that is gradually reduced. (Average value of n = 4)
(4) Fineness of filaments The network structure is cut into a size of 20 cm × 20 cm, and a filament having a length of 1 cm is collected from 10 locations. The specific gravity at 40 ° C. of the striatum collected at 10 locations is measured using a density gradient tube. Further, the cross-sectional area of the striatum sampled at the 10 locations is determined from a photograph enlarged with a microscope, and the volume of the striatum length of 10,000 m is determined therefrom. The value obtained by multiplying the obtained specific gravity and volume is defined as the fineness (gram weight of striatum 10000 m: decitex dtex). (Average value of n = 10).
(5) Feeling with a floor: 30 panelists (male 20-39 years old) having a body weight of 40 kg to 100 kg in a network structure of 50 cm square, thickness 5 cm, apparent density 0.040 to 0.050 g / cm ³ ; 5, 20-39-year-old women: 5, 40-59-year-old men: 5, 40-59-year-old women: 5, 60- to 80-year-old men: 5, 60-year-old 80-year-old woman: 5) sat down and evaluated the degree of feeling when they sat on the floor and when they sat down. Do not feel; ◎, feel almost; ○, feel a little; △, feel; ×
(6) Silence
30 panelists (men aged 20 to 39 years; men aged 20 to 39; 5 people, aged 20 to 39) in a network structure having a 50 cm square, a thickness of 5 cm and an apparent density of 0.040 to 0.050 g / cm ³ 5 year old women: 5 men, 40 to 59 years old: 5 women, 40 to 59 years old women: 5, 60 to 80 year old men: 5 people, 60 to 80 year old women: 5 people ) And satisfactorily qualitatively evaluated the sound generated from the network structure. Do not feel; ◎, feel almost; ○, feel a little; △, feel; ×
(6) Hollow ratio A strip is taken from a network structure, and after cooling with liquid nitrogen, it is cleaved, its cross section is observed with an electron microscope at a magnification of 50 times, and the obtained image is analyzed with a CAD system. The cross-sectional area (A) of the resin part and the cross-sectional area (B) of the hollow part were measured, and the hollow ratio was calculated by the formula {B / (A + B)} × 100.

<Synthesis Example 1>
Dimethyl terephthalate (DMT), 1,4-butanediol (1,4-BD) and polytetramethylene glycol (PTMG: average molecular weight 1000) are charged with a small amount of catalyst, and after transesterification by a conventional method, while raising the temperature and reducing the pressure Polycondensation was carried out to produce a polyester ether block copolymer elastomer of DMT / 1,4-BD / PTMG = 100/93/7 mol%, then 1% of an antioxidant was added, kneaded, pelletized, and 50 ° C. for 48 hours. Vacuum drying was performed to obtain a polyester-based thermoplastic elastomer raw material (A-1). The characteristics 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) are charged with a small amount of catalyst, and after transesterification by a conventional method, while raising the temperature and reducing the pressure Polycondensation was carried out to produce a polyester ether block copolymer elastomer of DMT / 1,4-BD / PTMG = 100/88/12 mol%, and then 1% antioxidant was added and kneaded and pelletized, followed by 50 ° C. for 48 hours. The polyester-based thermoplastic elastomer raw material (A-2) was obtained by vacuum drying. The characteristics 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) are charged with a small amount of catalyst, and after transesterification by a conventional method, while raising the temperature and reducing the pressure Polycondensation was carried out to produce a polyester ether block copolymer elastomer of DMT / 1,4-BD / PTMG = 100/84/16 mol%, then 1% antioxidant was added and kneaded, pelletized, and 50 ° C. for 48 hours. The polyester thermoplastic elastomer raw material (A-3) was obtained by vacuum drying. The characteristics 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) are charged with a small amount of catalyst, and after transesterification by a conventional method, while raising the temperature and reducing the pressure Polycondensation was carried out to produce a polyester ether block copolymer elastomer of DMT / 1,4-BD / PTMG = 100/72/28 mol%, and then 1% antioxidant was added and kneaded and pelletized, followed by 50 ° C. for 48 hours. A polyester thermoplastic elastomer raw material (A-4) was obtained by vacuum drying. The characteristics 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, and the conventional method is used. After the transesterification, polycondensation was carried out while raising the temperature and pressure, and a polyester ether block copolymer elastomer with DMT / DMI / 1,4-BD / PTMG = 75/25/92/8 mol% was produced, and then 1% antioxidant Was added, kneaded and pelletized, and vacuum dried at 50 ° C. for 48 hours to obtain a polyester-based thermoplastic elastomer raw material (A-5). The characteristics are shown in Table 1.

<Example 1>
70 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1 and 30 kg of a hydrogenated styrene-butadiene random copolymer (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals), 1 kg of trimellitic acid ester plasticizer (DIC monosizer W705), 10 kg polyester plasticizer (DIC polysizer A55), 0.25 kg hindered phenol antioxidant (ADEKA) “Adeka Stub AO330”) and 0.25 kg of phosphorous antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) were mixed for 5 minutes in a tumbler, and then the cylinder temperature was 220 ° C. with a twin screw extruder with a screw diameter of φ57 mm. It is melt-kneaded at a rotation speed of 130 rpm, extruded in a strand form in a water bath and cooled After, to obtain pellets of the resin composition. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Example 2>
80 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1 and 20 kg of a hydrogenated styrene-butadiene random copolymer (SBR) ("SOE S1611" manufactured by Asahi Kasei Chemicals), 1 kg of trimellitic acid ester plasticizer (DIC monosizer W705), 10 kg polyester plasticizer (DIC polysizer A55), 0.25 kg hindered phenol antioxidant (ADEKA) “Adeka Stub AO330”) and 0.25 kg of phosphorous antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) were mixed for 5 minutes in a tumbler, and then the cylinder temperature was 220 ° C. with a twin screw extruder with a screw diameter of φ57 mm. It is melt-kneaded at a rotational speed of 130 rpm, extruded in a strand form in a water bath, and cooled. After, to obtain pellets of the resin composition. From the nozzle in which a round solid shape orifice having a hole diameter of 1.0 mm is arranged at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction on the nozzle effective surface of the obtained resin composition having a width of 65 cm and a length of 5 cm, Melting at a temperature of 240 ° C., discharging a single hole at a discharge rate of 2.0 g / min, arranging cooling water under 30 cm of the nozzle surface, and a pair of pulling stainless steel endless nets with a width of 70 cm in parallel at intervals of 5 cm. Taking up the take-out conveyor so that it comes out partly on the surface of the water, pulling it into the cooling water at a speed of 1 m / min while sandwiching both sides while fusing the contact part, then solidify it, then hot air dryer at 100 ° C After the crystallization treatment for 15 minutes, the crystallization treatment was performed, and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Example 3>
80 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1 and 20 kg of a hydrogenated styrene-butadiene random copolymer (SBR) ("SOE S1611" manufactured by Asahi Kasei Chemicals), 1 kg of trimellitic acid ester plasticizer (DIC monosizer W705), 10 kg polyester plasticizer (DIC polysizer A55), 0.25 kg hindered phenol antioxidant (ADEKA) “Adeka Stub AO330”) and 0.25 kg of phosphorous antioxidant (“ADEKA STAB PEP36” manufactured by ADEKA) were mixed for 5 minutes in a tumbler, and then the cylinder temperature was 220 ° C. with a twin screw extruder with a screw diameter of φ57 mm. It is melt-kneaded at a rotational speed of 130 rpm, extruded in a strand form in a water bath, and cooled. After, to obtain pellets of the resin composition. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Example 4>
30 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1, 40 kg of the polyester-based thermoplastic elastomer (A-5) obtained in Synthesis Example 5, 30 kg of hydrogenated styrene-butadiene random copolymer Combined (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals), 0.5 kg trimellitic acid ester plasticizer (“Monicizer W705” manufactured by DIC), 10 kg polyester plasticizer (DIC) "Polysizer A55"), 0.25 kg of hindered phenolic antioxidant (ADEKA "ADK STAB AO330"), 0.25 kg of phosphorus antioxidant (ADEKA "ADK STAB PEP36") on the tumbler After mixing for 5 minutes, the cylinder temperature is 220 using a twin screw extruder with a screw diameter of 57 mm. Was melt-kneaded at a screw rotation speed 130 rpm, cooled extruded into strands in a water bath, to obtain pellets of the resin composition. From the nozzle in which a round solid shape orifice having a hole diameter of 1.0 mm is arranged at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction on the nozzle effective surface of the obtained resin composition having a width of 65 cm and a length of 5 cm, Melting at a temperature of 240 ° C., discharging a single hole at a discharge rate of 2.0 g / min, arranging cooling water under 30 cm of the nozzle surface, and a pair of pulling stainless steel endless nets with a width of 70 cm in parallel at intervals of 5 cm. Taking up the take-out conveyor so that it comes out partly on the surface of the water, pulling it into the cooling water at a speed of 1 m / min while sandwiching both sides while fusing the contact part, then solidify it, then hot air dryer at 100 ° C After the crystallization treatment for 15 minutes, the crystallization treatment was performed, and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Example 5>
30 kg of the polyester-based thermoplastic elastomer (A-1) obtained in Synthesis Example 1, 40 kg of the polyester-based thermoplastic elastomer (A-5) obtained in Synthesis Example 5, 30 kg of hydrogenated styrene-butadiene random copolymer Combined (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals), 0.5 kg trimellitic acid ester plasticizer (“Monicizer W705” manufactured by DIC), 10 kg polyester plasticizer (DIC) "Polysizer A55"), 0.25 kg of hindered phenolic antioxidant (ADEKA "ADK STAB AO330"), 0.25 kg of phosphorus antioxidant (ADEKA "ADK STAB PEP36") on the tumbler After mixing for 5 minutes, the cylinder temperature is 220 using a twin screw extruder with a screw diameter of 57 mm. Was melt-kneaded at a screw rotation speed 130 rpm, cooled extruded into strands in a water bath, to obtain pellets of the resin composition. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Example 6>
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, 20 kg of hydrogenated styrene-butadiene random copolymer Combined (SBR) (“SOE S1611” manufactured by Asahi Kasei Chemicals), 0.5 kg trimellitic acid ester plasticizer (“Monicizer W705” manufactured by DIC), 10 kg polyester plasticizer (DIC) "Polysizer A55"), 0.25 kg of hindered phenolic antioxidant (ADEKA "ADK STAB AO330"), 0.25 kg of phosphorus antioxidant (ADEKA "ADK STAB PEP36") on the tumbler After mixing for 5 minutes, the cylinder temperature is 220 using a twin screw extruder with a screw diameter of 57 mm. Was melt-kneaded at a screw rotation speed 130 rpm, cooled extruded into strands in a water bath, to obtain pellets of the resin composition. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Comparative Example 1>
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 of a phosphorus-based antioxidant ("ADEKA STAB PEP36" manufactured by ADEKA) was mixed for 5 minutes with a tumbler, melted and kneaded with a twin screw extruder with a screw diameter of 57 mm at a cylinder temperature of 200 ° C and a screw rotation speed of 130 rpm, and extruded into a water bath in a strand shape. After cooling, pellets of the resin composition were obtained. From the nozzle in which a round hollow orifice having a hole diameter of 3.0 mm is arranged on a nozzle effective surface having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 250 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Comparative example 2>
100 kg of the polyester-based thermoplastic elastomer (A-2) obtained in Synthesis Example 2 and 0.25 kg of a hindered phenol-based antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg of a phosphorus-based antioxidant ("ADEKA STAB PEP36" manufactured by ADEKA) was mixed for 5 minutes with a tumbler, melted and kneaded with a twin screw extruder with a screw diameter of 57 mm at a cylinder temperature of 200 ° C and a screw rotation speed of 130 rpm, and extruded into a water bath in a strand shape. After cooling, pellets of the resin composition were obtained. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Comparative Example 3>
100 kg of the polyester-based thermoplastic elastomer (A-3) obtained in Synthesis Example 3, 0.25 kg of a hindered phenolic antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg of a phosphorus-based antioxidant ("ADEKA STAB PEP36" manufactured by ADEKA) was mixed for 5 minutes with a tumbler, melted and kneaded with a twin screw extruder with a screw diameter of 57 mm at a cylinder temperature of 200 ° C and a screw rotation speed of 130 rpm, and extruded into a water bath in a strand shape. After cooling, pellets of the resin composition were obtained. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Comparative example 4>
100 kg of the polyester-based thermoplastic elastomer (A-4) obtained in Synthesis Example 4 and 0.25 kg of a hindered phenol-based antioxidant (“ADEKA STAB AO330” manufactured by ADEKA), 0.25 kg of a phosphorus-based antioxidant ("ADEKA STAB PEP36" manufactured by ADEKA) was mixed for 5 minutes with a tumbler, melted and kneaded with a twin screw extruder with a screw diameter of 57 mm at a cylinder temperature of 200 ° C and a screw rotation speed of 130 rpm, and extruded into a water bath in a strand shape. After cooling, pellets of the resin composition were obtained. From the nozzle obtained by arranging a round hollow orifice having a hole diameter of 3.0 mm on the effective surface of the nozzle having a width of 65 cm and a length of 5 cm on the effective surface of the obtained resin composition at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, 240 Melting at a temperature of ° C, discharging a single hole at a rate of 2.5 g / min, arranging cooling water under 30 cm of the nozzle surface, and taking a pair of stainless endless nets with a width of 70 cm at intervals of 5 cm The conveyor is placed on the water surface so that it is partly pulled out, and the contact part is melted, the both sides are sandwiched and drawn into the cooling water at a speed of 1 m / min, and then solidified in a 100 ° C hot air dryer. After 15 minutes of pseudo crystallization treatment, pseudo crystallization treatment was performed and then cut into a predetermined size to obtain a network structure. Table 2 shows the characteristics of the obtained network structure.

<Comparative Example 5>
100 kg of hydrogenated styrene-butadiene random copolymer (SBS) ("SOE S1611" manufactured by Asahi Kasei Chemicals Corporation) is a round hollow shape with a diameter of 3.0 mm on the effective surface of a nozzle having a width of 65 cm and a length of 5 cm. From a nozzle in which orifices are arranged at intervals of 5.2 mm in the width direction and 6.0 mm in the length direction, the nozzle is melted at a temperature of 240 ° C. and discharged at a single hole discharge rate of 2.5 g / min. Cooling water is distributed, a stainless steel endless net with a width of 70 cm is arranged in parallel at intervals of 5 cm so that a pair of take-out conveyors are partly exposed on the surface of the water, and the both sides are fused while the contact portions are fused. While being sandwiched, it is drawn into cooling water at a rate of 1 m / min and solidified, then subjected to pseudo crystallization treatment in a hot air dryer at 100 ° C. for 15 minutes, then pseudo crystallization treatment, and then cut into a predetermined size to form a network structure. To give the body. Table 2 shows the characteristics of the obtained network structure.

The present invention relates to a network structure that exhibits excellent quietness while maintaining cushioning properties, and can be used for vehicle seats, mattresses, and the like by taking advantage of the characteristics.

Claims (8)

From a three-dimensional random loop bonded 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 The tan δ at 23 ° C. measured using a continuous linear dynamic viscoelasticity measuring apparatus is 0.10 or more, and the three-dimensional random loop bonded structure is compressed by 25%. A network structure having an hour hardness of 10 kg / Φ200 mm or more. The network structure according to claim 1, wherein the continuous linear body is composed of a mixture of two or more different thermoplastic elastomers. The network structure according to claim 1 or 2, wherein at least one of two or more different thermoplastic elastomers is a polyester-based thermoplastic elastomer. The network structure according to claim 3, wherein the polyester-based thermoplastic elastomer is a polyester ether block copolymer or a polyester ester block copolymer. The network structure according to claim 3 or 4, wherein at least one of two or more different thermoplastic elastomers is a polyester thermoplastic elastomer and at least one is a polystyrene thermoplastic elastomer. The polystyrene-based thermoplastic elastomer is at least one selected from the group consisting of a styrene-butadiene random copolymer, a styrene-isoprene random copolymer, and a hydrogenated copolymer thereof. Reticulated structure. The network structure according to any one of claims 1 to 6, wherein the continuous linear body has a hollow cross section. The network structure according to any one of claims 1 to 6, wherein the continuous linear body has an irregular cross section.