Autoignition for igniting gas-generative compositions used in inflator devices for protective passive restraints

Abstract

An autoignition composition for a gas generant for an airbag or the like. The autoignition comprises a mixture of CuO as the oxidizer in a weight percentage of 45% to 75%, and aminoguanidine nitrate as the fuel in a weight percentage of 25% to 55%. To increase the flame temperature of the mixture, a metal fuel such as magnesium or aluminum can be added.

1 . An autoignition composition for a gas generant for inflating an airbag or the like, said autoignition composition comprising a mixture of CuO as the oxidizer in a weight percentage of 45% to 75%, and aminoguanidine nitrate as the fuel in a weight percentage of 25% to 55%. 
     
     
         2 . The autoignition composition of  claim 1  using an oxygen balance of approximately −2% which is 55% CuO by weight and 45% aminoguanidine nitrate by weight. 
     
     
         3 . The autoignition composition of  claim 2  wherein the adiabatic constant pressure flame temperature at 7 MPa is approximately 1793° K. 
     
     
         4 . The autoignition composition of  claim 3  wherein the composition ignites at 150° C. 
     
     
         5 . The autoignition composition of  claim 1  wherein a metal fuel is added to increase the flame temperature of the mixture. 
     
     
         6 . The autoiginition composition of  claim 5  wherein the metal fuel is aluminum or magnesium. 
     
     
         7 . The autoignition composition of  claim 6  wherein the weight percentage of magnesium or aluminum is less than 20%.