| abstract |
A TPU keypad being manufactured by the thermoforming of a TPU sheet, characterized in that said thermoplastic polyurethane resin sheet is molded through melting resin pellets prepared through reacting an organic diisocyanate (A) comprising HDI (A1) as a primary component, a high molecular weight polyol (B) comprising a polycarbonate diol (B1) as a primary component, and a chain extender (C) comprising an aliphatic diol having 2 to 10 carbon atoms (C1) as a primary component. The above TPU is excellent in formability, the resistance to oleic acid, the resistance to discoloration, transparency, and the suitability for printing. |