| 摘要 |
<p>A headrest for alleviating whiplash injury and comprising at least one support member which is uprightly fixed to a seat and a cushioning member of polyurethane foam attached to said at least one support member and enclosed in a covering material is disclosed, wherein the polyurethane foam is one having the following properties: A) A density within the range of 50 to 100 kg/m3; B) a compressive strength between 0.9 and 3.5 mN/mm2 at 25 % deformation and between 1.3 and 4.5 mN/mm2 at 40 % deformation; C) a glass transition temperature, Tg (DSC), between -10 °C and +10 °C, preferably -5 °C to +4 °C; D) a loss temperature peak maximum between 15 and 30 °C; E) a temperature range for the loss peak between -40 °C and +90 °C; and F) a loss peak area between 4.0 and 8.0.</p> |
