Headrest for alleviating whiplash injury and the use of specific polyurethane foams therein
First Claim
1. 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/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, 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.
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Accused Products
Abstract
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.
13 Citations
10 Claims
-
1. 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/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, 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.; andF) a loss peak area between 4.0 and 8.0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification