Patent ID: 8067476
Filing Date: 2011-11-29
Classification: C08G,C08J,C08L

Abstract:
1. A process for preparing a foamed thermoplastic polyurethane material having a density between 100 and 800 kg/m 3 wherein the foaming of the thermoplastic polyurethane is carried out by an injection molding process comprising injecting a thermoplastic polyurethane pellet, a thermally expandable microsphere, an additional blowing agent, and a binding agent into a mould; and heating the contents of the mould to form the polyurethane material; wherein said thermally expandable microsphere comprises a hydrocarbon, and wherein the binding agent comprises a polymeric component that has a melt processing onset temperature range that is below the melt processing onset temperature range of the thermoplastic polyurethane pellet.