Energy absorbing materials
AssigneeNational Research Development Corporation
InventorMaurice Arthur Frederick Hiles
Life of this patent
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Abstract
A novel elastomer having a very low compression set and a very slow recovery from compression comprises a flexible polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, and is the reaction product of a substantially linear polyol having hydroxyl end groups and a molecular weight in the range 6000 to 12000, with an isocyanate in less than stoichiometric amount. This elastomer can be used as one layer of an energy-absorbing material, in combination with a more difficultly compressible layer comprising a tough flexible polymeric matrix having a plurality of rigid hollow bodies embedded therein.
Claims16
An energy-absorbing material which comprises an elastomer layer of polymeric material having a low compression set and a delayed recovery from compression, in combination with a more difficultly compressible layer, said last mentioned layer comprising a tough flexible polymeric matrix having a plurality of substantially unbroken rigid hollow bodies embedded therein the arrangement being such that under the action of deforming forces deformation of the layers takes place sequentially.
Dependencies are inferred from the claim text.