Net-like structure having excellent low resilience characteristics
To provide a net-like structure having excellent low resilience characteristics, cushioning properties, and durability. The net-like structure has a three-dimensional random loop bonded structure constituted of a continuous linear body made of a thermoplastic elastomer having a fiber diameter of 0.1-3.0 mm and a styrene content of 10-40 mass %, the net-like structure having an apparent density of 0.005-0.30 g/cm 3 and a 40° C. compression residual strain of less than or equal to 35%.
1. A net structure, comprising:
a three-dimensional random loop bonded structure constituted of a continuous linear body comprising a thermoplastic elastomer composition;
wherein the continuous linear body has a fiber diameter of 0.1-3.0 mm;
wherein the thermoplastic elastomer composition has a styrene content of 10-40 mass %,
wherein the net structure has apparent density of 0.005-0.30 g/cm 3 and a 40° C. compression residual strain of less than or equal to 35%,
wherein the thermoplastic elastomer composition is either
(i) an alloy consisting of at least two kinds of styrene-based thermoplastic elastomers different in resin composition, or
(ii) an alloy consisting of a styrene-based thermoplastic elastomer and a polyolefin-based thermoplastic elastomer, the polyolefin-based thermoplastic elastomer being an α-olefin copolymer resin selected from the group consisting of ethylene, propylene, and α-olefin having 4 or more carbons.
2. The net structure according to claim 1 , wherein a residual strain after 80,000 times of constant displacement repeated compression is less than or equal to 15%.
3. The net structure according to claim 1 , wherein a hysteresis loss is 35-85%, a compression deflection coefficient is 2.5-85.0, and a thickness is 5-300 mm.
4. The net structure according to claim 1 , wherein the net structure is used for a cushion material, a shock absorber, or a buffer.
5. The net structure according to claim 2 , wherein a hysteresis loss is 35-85%, a compression deflection coefficient is 2.5-85.0, and a thickness is 5-300 mm.
6. The net structure according to claim 2 , wherein the net structure is used for a cushion material, a shock absorber, or a buffer.
7. The net structure according to claim 3 , wherein the net structure is used for a cushion material, a shock absorber, or a buffer.
8. The net structure according to claim 1 ,
wherein the thermoplastic elastomer composition is the alloy of the styrene-based thermoplastic elastomer and the polyolefin-based thermoplastic elastomer, and
wherein the content of the styrene-based thermoplastic elastomer in the alloy is greater than the content of the polyolefin-based thermoplastic elastomer in the alloy.
9. The net structure according to claim 8 , wherein the polyolefin-based thermoplastic elastomer is 1-30 mass % of the thermoplastic elastomer composition.
10. The net structure according to claim 1 , wherein the thermoplastic elastomer composition includes a styrene-based thermoplastic elastomer having a styrene content of greater than or equal to 40 wt %.