Impact energy-absorbing urethane foam

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

C - Chemistry, Metallurgy

08

G

293/18, 403/41

C08G 18/50 (2006.01) B60R 19/22 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/63 (2006.01) C08J 9/34 (2006.01)

Patent

CA 1076748

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.3. The foam formulation is based on a prepolymer polyol of a poly (oxypropylene) trio capped with a styrene/acrylonitrile copolymer which is reacted with a 50 to 150 equivalent weight amine or polyol crosslinker of 2 to 6 functionality and with a TDI/glycol or trio quasi-prepolymer, along with a relatively high amount of water. -1-

236925

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