Impact energy-absorbing urethane foam

Details Impact energy-absorbing urethane foam Impact energy-absorbing urethane foam

1976-12-02

1978-09-26

Ivy, C. Warren

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 455, 264 466, 264 468, 264DIG14, 293 71P, 428425, 521159, 521167, 521176, C08G 1863, C08G 1865

Patent

active

041168933

ABSTRACT:
An impact energy-absorbing, relatively low density, urethane foam for use in automobile bumpers has a high content of urea linkages and is relatively temperature insensitive, i.e. gives approximately the same physical performance over a wide range of temperature. The foam is water blown in a closed mold from a quasi-prepolymer system. The pack factor is preferably in the range of 1.5 to 8 and the molded density is in the range of 5 to 20 lbs./ft..sup.3.
The foam formulation is based on a polyol of a poly (oxypropylene/ethylene) triol reacted with a styrene/acrylonitrile monomer mixture which triol thus modified is reacted with (1) a 50 to 150 equivalent weight polyol cross linker of 2 to 6 functionality, (2) a MDI or TDI/glycol or triol quasi-prepolymer and (3) some water.

REFERENCES:
patent: 3632707 (1972-01-01), Rice
patent: 3795636 (1974-03-01), Nuffmani
patent: 3876569 (1975-04-01), Priest
patent: 3907721 (1975-09-01), Gurgiolo
patent: 3926867 (1975-12-01), Quock
patent: 3939106 (1976-02-01), Dunleavy
patent: 4007139 (1977-02-01), Gurgiolo
patent: 4020001 (1977-04-01), White
patent: 4065410 (1977-12-01), Schafer

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