Gas generating composition

Abstract

The present invention provides a gas generating composition, especially for use in safety devices for vehicles, comprising a) 40 to 60% by weight of a fuel consisting of one or more components selected from the group of guanidine compounds; b) 40 to 60% by weight of basic copper nitrate; c) 0 to 8% by weight of at least one transition metal oxide; d) 1 to 5% by weight of at least one stabilizer component and e) 0 to 5% by weight of further additives, each related to the total weight of the components a) through e); the stabilizer component at room temperature having a solubility in water of not more than 1 g/100 ml and the solubility in water at T=90° C. amounting to at least seven times the solubility at room temperature.

1 . A gas generating composition, especially for use in safety devices for vehicles, comprising:
 a) 40 to 60% by weight of a fuel consisting of one or more components selected from the group of guanidine compounds;   b) 40 to 60% by weight of basic copper nitrate;   c) 0 to 8% by weight of at least one transition metal oxide; and   d) 1 to 5% by weight of at least one stabilizer component   e) 0 to 5% by weight of further additives, each related to the total weight of the components a) through e);   wherein the stabilizer component at room temperature has a solubility in water of not more than 1 g/100 ml and the solubility in water at T=90° C. amounts to at least seven times the solubility at room temperature.   
     
     
         2 . The composition according to claim wherein the guanidine compound is selected from the group consisting of guanidine carbonate, guanidine nitrate, guanidine perchlorate, aminoguanidine nitrate, diaminoguanidine nitrate, triaminoguanidine nitrate, nitroguanidine or mixtures thereof. 
     
     
         3 . The composition according to  claim 1 , wherein the guanidine compound consists of guanidine nitrate. 
     
     
         4 . The composition according to  claim 1 , wherein the solubility of the stabilizer component in water at room temperature is within the range of from 0.05 g/100 ml to 1.0 g/100 ml. 
     
     
         5 . The composition according to  claim 1 , wherein the solubility of the stabilizer component in water at 90° C. is higher by at least the factor 10 than the solubility at room temperature. 
     
     
         6 . The composition according to  claim 1 , wherein the stabilizer component is selected from the group consisting of cyanuric acid, melamine cyanurate, potassium bitartrate and 3,5 dinitrobenzoic acid. 
     
     
         7 . The composition according to at least one of  claim 1 , wherein the composition exhibits an oxygen balance of from −3 to +1%. 
     
     
         8 . The composition according to  claim 7 , wherein the composition exhibits an oxygen balance of from −2 to 0%. 
     
     
         9 . The composition according to  claim 1 , wherein the transition metal oxide is present at a proportion of 0 to 5% by weight. 
     
     
         10 . The composition according to  claim 1 , wherein the transition metal oxide is selected from the group consisting of TiO 2 , Cr 2 O 3 , MnO 2 , Fe 2 O 3 , Fe 3 O 4 , CuO, Cu 2 O and mixtures thereof. 
     
     
         11 . The composition according to  claim 1 , wherein the composition consists of the components a) through e). 
     
     
         12 . The composition according to  claim 1 , consisting of
 44 to 52% by weight of at least one guanidine compound, preferably guanidine nitrate,   40 to 50% by weight of basic copper nitrate,   0 to 5.0% by weight of at least one transition metal oxide,   2 to 5% by weight of at least one stabilizer component; and   0 to 4% by weight of further additives; each related to the total composition.   
     
     
         13 . The composition according to  claim 12 , consisting of:
 44 to 52% by weight of guanidine nitrate,   44 to 52% by weight of basic copper nitrate,   0 to 0.2% by weight of at least one transition metal oxide,   2 to 5% by weight of at least one stabilizer component; and   0 to 4% by weight of further additives; each related to the total composition.