Azide-free, gas-generating composition

Abstract

The present invention relates to an azide-free gas-generating composition, in particular for use in safety devices for motor vehicles, comprising a fuel in a proportion of 20 to 60% by weight and consisting of one or more components, and an oxidizer mixture in a proportion of 40 to 80% by weight and consisting of at least three components, each in relation to the total composition. In accordance with the invention, the fuel consists of a guanidine compound in a proportion of at least 95% by weight and a further fuel component in a proportion of 0 to less than 5% by weight, each in relation to the fuel, and the oxidizer mixture consists of one or more transition metal oxides in a proportion of 20 to 80% by weight, basic copper nitrate in a proportion of 0 to 50% by weight, metal chlorate, metal perchlorate, ammonium perchlorate or mixtures thereof in a proportion of 1 to 15% by weight and alkali metal nitrate, alkaline earth metal nitrate or mixtures thereof in a proportion of 1 to 15% by weight, each in relation to the oxidizer mixture.

1 . An azide-free gas-generating composition, in particular for use in safety devices for motor vehicles, comprising a fuel in a proportion of 20 to 60% by weight and consisting of one or more components, and an oxidizer mixture in a proportion of 40 to 80% by weight and consisting of at least three components, each in relation to the total composition, wherein the fuel consists of a guanidine compound in a proportion of at least 95% by weight and a further fuel component in a proportion of 0 to less than 5% by weight, each in relation to the fuel, and wherein the oxidizer mixture consists of one or more transition metal oxides in a proportion of 20 to 80% by weight, basic copper nitrate in a proportion of 0 to 50% by weight, metal chlorate, metal perchlorate, ammonium perchlorate or mixtures thereof in a proportion of 1 to 15% by weight and alkali metal nitrate, alkaline earth metal nitrate or mixtures thereof in a proportion of 1 to 15% by weight, each in relation to the oxidizer mixture.  
     
     
         2 . The composition according to  claim 1 , 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 further fuel component is an organic compound which has an oxygen balance of more than −90%.  
     
     
         4 . The composition according to  claim 1 , wherein the further fuel component is selected from the group consisting of cyanuric acid, urea, oxamide, urazol, alloxane, alloxantine and parabanic acid or mixtures thereof.  
     
     
         5 . The composition according to  claim 1 , wherein the transition metal oxide is selected from the group consisting of Cr 2 O 3 , MnO 2 , Fe 2 O 3 , Fe 3 O 4 , CuO, Cu 2 O or mixtures thereof.  
     
     
         6 . The composition according to  claim 1 , further comprising processing aids in a proportion of up to 5% by weight, in relation to the total composition, the processing aids being selected from the group consisting of trickling aids, pressurizing aids and/or lubricants.  
     
     
         7 . The composition according to  claim 1 , essentially consisting of 30 to 60% by weight guanidine nitrate, 0 to 3.15% by weight cyanuric acid, 15 to 30% by weight CuO, 15 to 30% by weight basic copper nitrate, 0.1 to 5% by weight ammonium perchlorate and 1 to 5% by weight alkali- and/or alkaline earth metal nitrate, each in relation to the total composition.  
     
     
         8 . The composition according to  claim 1 , wherein the oxidizer mixture simultaneously contains Fe 2 O 3  and CuO.  
     
     
         9 . The composition of  claim 8 , wherein the Fe 2 O 3  is present in an amount of at least 4% by weight, in relation to the total composition.  
     
     
         10 . The composition of  claim 7 , wherein CuO is partly replaced by Fe 2 O 3 .