| 摘要 |
<p>The present invention is a thermoplastic polyurethane (TPU) or thermoplastic polyurethane/urea (TPUU) comprising structural units of: a) a diisocyanate; b) ethylene glycol, diethylene glycol, or (1),(3)-propanediol; c) a diol, a diamine, or an amino alcohol different from the one selected in (b) and having a molecular weight of less than (400) Daltons; and (d) ethylene oxide polyol or ethylene oxide-capped propylene oxide polyol. The TPU or TPUU has low temperature flexibility, high moisture vapor transition rates, and is considerably less expensive than state-of-the-art TPUs or TPUUs. The preferred composition is a TPU that is substantially free of phase segregation, and consequently has clarity and tensile strengh not known for TPUs prepared using ethylene oxide-capped propylene oxide polyol.</p> |
