Energy absorbing foams
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United States of America Patent
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-
Jul 16, 2002
Grant Date -
N/A
app pub date -
Jan 18, 2001
filing date -
Jan 18, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Polyurethane foams formed under vacuum (below atmospheric pressure) conditions using a specific mixture of polyisocyanate and with a major portion of methylene diisocyanate (MDI) and a specific mixture of polyether and graft polyols exhibit superb static shock cushioning characteristics (energy absorption) as illustrated by drop curves of deceleration versus static load. The foam-forming ingredients are mixed together and foamed under controlled pressures in the range 0.5 to 0.90 bar (absolute), preferably 0.5 to 0.8 bar (absolute). A major portion of the MDI is 4, 4' methylene diisocyanate.
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