Gas generating composition

Abstract

A gas generating composition is obtained in which an amount of a combustion residue based on a unit amount of a gas generated is reduced. A gas generating composition comprising nitroguanidine, guanidine nitrate or a mixture thereof as a fuel and further an oxidizing agent. The oxidizing agent is a perchloric acid salt, a nitric acid salt or a mixture thereof, and when the oxidizing agent is ammonium perchlorate, a chlorine neutralizer is further incorporated.

1 . An inflator system for an air bag system comprising a gas generating composition in the form of an extrusion-molded article, said gas generating composition comprising a blend of a fuel comprising nitroguanidine, guanidine nitrate, or a mixture thereof,
 an oxidizing agent comprising a mixture of potassium perchlorate and strontium nitrate, and   a binder comprising sodium carboxymethylcellulose and Japanese acid clay,   wherein said extrusion-molded gas generating article is produced by extrusion molding processing.   
   
   
       2 . The air bag inflator system of  claim 1 , wherein the gas generating composition further comprises a chlorine neutralizer. 
   
   
       3 . The air bag inflator system of  claim 2 , wherein the chlorine neutralizer in the gas generating composition is a compound containing a cation selected from the group consisting of alkali metals and alkaline earth metals. 
   
   
       4 . The air bag inflator system of  claim 3 , wherein the chlorine neutralizer in the gas generating composition is a silicic acid salt, an oxalic acid salt, an oxide, a peroxide, a cellulose salt, a salt of tetrazole, a salt of triazole, or a salt of bitetrazole 
   
   
       5 . The air bag inflator system of  claim 1 , wherein the content of the fuel in the gas generating composition is between 35 and 80% by weight and the content of the oxidizing agent in the gas generating composition is between 65 and 20% by weight. 
   
   
       6 . The air bag inflator system of  claim 1 , wherein the gas generating composition further comprises a combustion catalyst as an additive. 
   
   
       7 . The air bag inflator system of  claim 1 , wherein an amount of a combustion residue from the gas generating composition based on an amount of a gas generated is 12 g/mol or less. 
   
   
       8 . A gas generating method using a gas generated by burning a fuel, in which a gas generating composition comprising a fuel comprising nitroguanidine, guanidine nitrate, or a mixture thereof, an oxidizing agent comprising a mixture of potassium perchlorate and strontium nitrate, and a binder comprising sodium carboxymethylcellulose and Japanese acid clay is formed into a gas generating article by extrusion molding and subsequently employed as a fuel in an air bag system, thereby decreasing an amount of a combustion residue and improve a gas output.