| 摘要 |
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.
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