Patent ID: 8906508
Filing Date: 2014-12-09
Classification: A63B,B05D,B32B,Y10T

Abstract:
1. A method for toughening a thermoplastic polyurethane (TPU) surface, the method comprising: A. immersing the TPU surface into a polyurethane solution comprising a penetrating agent selected from the group consisting of solvents for TPU, wherein the polyurethane solution includes a polyurethane prepared from reactants comprising at least one polyester polyol and at least one isocyanate, and a catalyst, wherein the polyurethane solution has a solids concentration of between about 6 wt percent and about 20 wt percent and wherein the TPU surface is immersed for a time sufficient to swell the TPU surface and allow some of the polyurethane solution to enter the TPU surface; B. drying the surface to evaporate the solvent; and C. curing the polyurethane to form an interpenetrating polymer network with the TPU and form a toughened TPU surface.