UV CURED ADHESIVE, KEYPAD STRUCTURE FOR MOBOLE PHONE AND METHOD FOR BONDING KEY TO KEYPAD

摘要

A UV curable adhesive for adhering keys to a keypad of a mobile phone is provided to solve the problem of a low UV transmission occurring in a thermoplastic polyurethane pad, to accomplish a high curing rate, and to realize excellent adhesion. A UV curable adhesive comprises: 25-70 wt% of a polyurethane acrylate oligomer; 15-40 wt% of an acrylate monomer; 1-10 wt% of a photoinitiator; and 0.1-5 wt% of a photosensitizer and additives. The polyurethane acrylate oligomer has a number average molecular weight of 1,000-30,000. The UV curable adhesive has spectral peaks with a wave number of 1575-1589cm^-1, 1599-1605cm^-1, 2869-2879cm^-1 and 2940-2955cm^-1.