Gas generating composition

Abstract

There is provided a gas generating composition in which the concentration of NOx and so on in the fuel gas is low. The gas generating composition comprises a fuel, a metal hydroxide such as aluminum hydroxide, and a binder, wherein the content of the metal hydroxide in the composition is in the range of 0.5 to 15 mass %, and the content of the binder in the composition is in the range of 1.0 to 4.5 mass %. Because the concentration of NOx and so on in the fuel gas is low, in the case of use in an air bag gas generator, passenger safety upon inflation of the air bag is high.

1 . A gas generating composition comprising a fuel, a metal hydroxide and a binder, wherein the content of the metal hydroxide in the composition is in the range of 0.5 to 15 mass % and the content of the binder in the composition is in the range of 1.0 to 4.5 mass %.  
     
     
         2 . The gas generating composition as claimed in  claim 1 , wherein the metal hydroxide is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zirconium hydroxide, cobalt hydroxide and copper hydroxide.  
     
     
         3 . The gas generating composition as claimed in  claim 1 , wherein the metal hydroxide is at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide and a mixture thereof.  
     
     
         4 . The gas generating composition as claimed in  claim 1  or  2 , wherein the mass ratio between the metal hydroxide to the binder is in the range of 15/1 to 1/2.  
     
     
         5 . The gas generating composition as claimed in  claim 1  or  2 , wherein the binder is at least one selected from the group consisting of carboxymethyl cellulose, sodium carboxymethyl cellulose, potassium carboxymethyl cellulose, ammonium carboxymethyl cellulose, cellulose acetate, cellulose acetate butyrate, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl ethyl cellulose, microcrystalline cellulose, polyacrylamide, aminated polyacrylamide, polyacrylhydrazide, an acrylamide-metal acrylate copolymer, a polyacrylamide-polyacrylic ester copolymer, polyvinyl alcohol, acrylic rubber, guar gum, starch and silicone.  
     
     
         6 . The gas generating composition as claimed in  claim 1  or  2 , further comprising an oxidizing agent.