Energy absorbing foams

Details Energy absorbing foams Energy absorbing foams

1997-12-31

2000-03-07

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 51, 264 52, 521174, 521130, 523347, C08J 908, C08L 7508, B29C 4410, B29C 6720

Patent

active

060341483

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%.

REFERENCES:
patent: 4777186 (1988-10-01), Stang et al.

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