KEYPAD FOR CELLULAR PHONE

摘要

PURPOSE: A keypad for cellular phone is provided to secure excellent heat resistance and tensile properties with non-yellowing property and thickness uniformity. CONSTITUTION: A keypad for cellular phone includes a thermoplastic polyurethane sheet or film. The thermoplastic polyurethane sheet or film includes; based on 100 mol% organic diisocyanates, in the presence of an organic tin-based catalyst, organic diisocyanates containing 3 - 20 mol% isophorone diisocyanate and 80 - 97 mol% 1,6-hexamethylene diisocyanate; polycarbonate-based diols; and chain extenders.