Energy absorbing foams
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 7, 2000
Issued Date -
N/A
app pub date -
Dec 31, 1997
filing date -
Jul 19, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Polyurethane foams formed at elevated pressure using a graft polyol, or mixture of polyols to form a polyol system, having a low functionality and a high solids content, exhibit superior dynamic shock cushioning characteristics (energy absorption) as illustrated by the drop curves of deceleration versus static load. The foam-forming ingredients are mixed together and foamed under controlled pressures in the range of 1.2 to 1.5 bar, preferably 1.3 to 1.4 bar. The polyol preferably has a functionality in the range of about 2.0 to 2.5, a hydroxyl number in the range of about 50 to 90, a solids content above about 35%, preferably about 50 to 55%.
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