초록 ▼

Cushions for dynamic impact applications include anisotropic cellular polymers made in an extrusion, expanded bead or reactive foaming process. The anisotropic behavior represented by CE/CT, CV/CT and CH/CT, wherein CE, CV and CH represent the compressive strength of the cellular polymer in each of

Cushions for dynamic impact applications include anisotropic cellular polymers made in an extrusion, expanded bead or reactive foaming process. The anisotropic behavior represented by CE/CT, CV/CT and CH/CT, wherein CE, CV and CH represent the compressive strength of the cellular polymer in each of three orthogonal directions E, V and H, respectively, as measured by compressing a 25-50 mm thick sample of the cellular polymer at a strain rate of 0.08 s−1 to 25% strain, CT represents the sum of CE, CV and CH, and at least one of CE/CT, CV/CT and CH/CT has a value of at least 0.40, up to about 0.80. The cellular polymer also preferably has density of 1.75 to 2.35 pounds/cubic foot and a compressive stress in the direction of maximum compressive strength of 290-600 kPa at 25% strain when used for headliner countermeasure applications. The cushions are useful in automotive applications such as automotive headliners, door panels, knee bolsters, pillars, headrests, seat backs, load floors or instrument panels.

대표청구항 ▼

What is claimed is: 1. A vehicle having at least one impact-absorbing headliner, door panel, pelvic bolster, armrest, thorax bolster, knee bolster, pillar, headrest, seat back, load floor or instrument panel located within the passenger compartment of the vehicle, the impact-absorbing headliner, doo

What is claimed is: 1. A vehicle having at least one impact-absorbing headliner, door panel, pelvic bolster, armrest, thorax bolster, knee bolster, pillar, headrest, seat back, load floor or instrument panel located within the passenger compartment of the vehicle, the impact-absorbing headliner, door panel, pelvic bolster, armrest, thorax bolster, knee bolster, pillar, headrest, seat back, load floor or instrument panel including a cellular polymer oriented such that the direction of the highest compressive strength is oriented in an expected direction of impact of a vehicle occupant with the cellular polymer and a rigid support against which the cellular polymer is compressed during such an impact, wherein the polymer is a styrene polymer or a styrene-acrylonitrile copolymer and the cellular polymer is formed by extruding a single, continuous mass of a foamable resin mixture in a direction of extrusion, and further wherein the cellular polymer exhibits anisotropic behavior represented by CE/CT, CV/CT and CH/CT, wherein CE, CV and CH represent the compressive strength of the cellular polymer in each of three orthogonal directions E, V and H, respectively, as measured by compressing a 25-50 mm thick sample of the cellular polymer at a strain rate of 0.08 s−1 to 25% strain, CT represents the sum of CE, CV and CH, and at least one of CE/CT, CV/CT and CH/CT has a value of from 0.50 to 0.80.