Article comprising tubular particles
This disclosure provides an article having a density of from 0.03 to 0.45 g/cc and including a plurality of anisotropic tubular particles that are randomly oriented in the article. The tubular particles include a thermoplastic elastomer foam and a polymer disposed on an exterior surface of the thermoplastic elastomer foam as an outermost layer of the particles. Each of the thermoplastic elastomer foam and the polymer independently has a softening temperature determined according to DIN ISO306. The softening temperature of the polymer is at least 5° C. lower than the softening temperature of the thermoplastic elastomer foam.
1. An article having a density of from 0.03 to 0.45 g/cc and comprising a plurality of anisotropic hollow tubular particles that are randomly oriented in said article, wherein said tubular particles each comprise (i) an inner layer formed from a thermoplastic elastomer foam, (ii) an outermost layer encircling the inner layer formed from a polymer disposed on an exterior surface of said thermoplastic elastomer foam, and (iii) an intermediate polymer layer disposed between and in direct contact with the inner layer and the outermost layer,
wherein each of said thermoplastic elastomer foam and said polymer independently has a softening temperature determined according to DIN ISO 306, and wherein the softening temperature of said polymer is at least 5° C. lower than the softening temperature of said thermoplastic elastomer foam.
2. The article of claim 1 wherein said thermoplastic elastomer foam is a thermoplastic polyurethane foam.
3. The article of claim 2 wherein said thermoplastic polyurethane foam is the foamed reaction product of a polyether polyol, an isocyanate component, and a chain extender.
4. The article of claim 2 wherein said thermoplastic polyurethane foam is the foamed reaction product of a polyester polyol, an isocyanate component, and a chain extender.
5. The article of claim 2 wherein said thermoplastic polyurethane foam is the foamed reaction product of an aliphatic and/or olefinic polyol, an isocyanate component and a chain extender.
6. The article of claim 1 wherein said thermoplastic elastomer foam is formed from a thermoplastic polyurethane that has a hardness from 40A to 83D as determined using DIN ISO 7619-1.
7. The article of claim 1 wherein said thermoplastic elastomer foam is formed from a thermoplastic polyurethane that has a hardness from 80A to 95A as determined using DIN ISO 7619-1.
8. The article of claim 1 wherein said thermoplastic elastomer foam is chosen from thermoplastic polyester elastomers (TPE), thermoplastic styrenic elastomers (TPS), thermoplastic polyamides (TPA), thermoplastic vulcanates (TPV), thermoplastic polyolefins (TPO), and combinations thereof.
9. The article of claim 1 wherein said thermoplastic elastomer foam has a density of from 0.1 to 0.6 g/cc.
10. The article of claim 1 having an ultimate breaking strength of from 0.1 to 4.0 megapascal as determined using ASTM D 5035.
11. The article of claim 1 wherein said tubular particles are fused together at a plurality of points.
12. The article of claim 1 wherein said polymer that is disposed on the exterior surface of said thermoplastic elastomer foam is disposed on and in direct contact with said thermoplastic elastomer foam.
13. The article of claim 1 wherein each tubular particle further comprises an innermost polymer layer disposed on and in direct contact with said thermoplastic elastomer foam such that said thermoplastic elastomer foam is disposed between said innermost polymer layer and said intermediate polymer layer.
14. The article of claim 1 wherein said polymer that is disposed on the exterior surface of said thermoplastic elastomer foam is foamed.
15. The article of claim 1 wherein said polymer that is disposed on the exterior surface of said thermoplastic elastomer foam is non-foamed.
16. The article of claim 1 wherein said polymer that is disposed on the exterior surface of said thermoplastic elastomer foam is further defined as a thermoplastic polyurethane.
17. The article of claim 1 wherein each of said tubular particles independently has a length from 1 to 30 mm and a diameter from 1 to 30 mm.
18. The article of claim 1 that is further defined as a shoe sole, a cushion, a flooring material, or a flooring substrate.