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A series of transparent polyurethane films with different R (the molar ratio of NCO/OH) were prepared by using isophorone (IPDI), polyoxytertramethylene (PTMG) and hydroxypropyl polyols as the main materials.These films were examined for light transmittance, haze, gloss, mechanical properties, water absorption, water contact angle, hardness, solvent and ultraviolet aging resistance.