| 摘要 |
PROBLEM TO BE SOLVED: To obtain a material that can be formed into film with a sintering process even at a low processing temperature by a method for sintering a powdery thermoplastic polyurethane having a melt index, a relative solution viscosity and a Shore hardness within specific ranges, respectively. SOLUTION: This flexible elastic polyurethane (TPU) film is obtained by a method comprising sintering at least one kind of powdery thermoplastic polyurethane having a melt index of 20 to 100, preferably 30 to 60, a relative solution viscosity of 1.15 to 1.45, preferably 1.25 to 1.35, and a Shore hardness of 80 to 98, preferably 85 to 94, when a load of 21.2N is applied at 190 deg.C in a heated mold. The powdery thermoplastic polyurethane can be obtained by the reaction of an organic diisocyanate, a polyol, a chain extender, if necessary, a conventional auxiliary substance and a conventional additive by the help of a heated mold. The sintering of the TPU is preferably carried out at a mold temperature of 180 to 215 deg.C, especially 190 to 210 deg.C. |
