Patent ID: 7144081

Claim:
A headrest for alleviating whiplash injury 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, the polyurethane foam having the following properties: A) A density within the range of 50 to 100 kg/m 3 ; B) a compressive strength between 0.9 and 3.5 mN/mm 2 at 25% deformation and between 1.3 and 4.5 mN/mm 2 at 40% deformation; C) a glass transition temperature, Tg, between −10° C. and +10° 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.