Gas generant composition for gas actuator for activating safety device and gas generator for gas actuator using the same

Abstract

Disclosed is a gas generant composition for a gas actuator used for activating a safety device, which contains (A) a nitrogen-containing organic compound, (B) a metal nitrate and/or a perchlorate, (C) a water-soluble polymer binder, and (D) a magnetic material. When compared with the conventional gas generant compositions, this gas generant composition is excellent in combustibility under low pressure conditions and reduced in CO gas generation during combustion. In this gas generant composition, (D) the magnetic material is preferably composed of a magnetic iron oxide. It is also preferable that (A) the nitrogen-containing organic compound is composed of one or more substances selected from nitroguanidine, guanidine nitrate, bitetrazole, azobistetrazole and 5-aminotetrazole; (B) the metal nitrate is composed of a metal salt selected from alkali metals and alkaline earth metals, while the perchlorate is composed of ammonium perchlorate or potassium perchlorate; (C) the water-soluble polymer binder is composed of a mixture of hydroxypropyl methylcellulose (HPMC) and a polyacrylamide; and (D) the magnetic iron oxide has a spinel crystal structure.

1 . A gas generant composition for a gas actuator for activating a safety device, containing the following components (A) to (D):
 (A) a nitrogen-containing organic compound, (B) metal nitrate and/or perchlorate, (C) a water-soluble polymer binder, and (D) a magnetic material.   
   
   
       2 . The gas generant composition according to  claim 1 , wherein
 (D) the magnetic material is (D) magnetic iron oxide.   
   
   
       3 . The gas generant composition according to  claim 2 , wherein
 (A) the nitrogen-containing organic compound is at least one substance selected from nitroguanidine, guanidine nitrate, bitetrazole, azobistetrazole and 5-aminotetrazole, (B) the metal nitrate is a metal salt selected from alkali metals and alkaline earth metals while the perchlorate is ammonium perchlorate or potassium perchlorate, and (C) the water-soluble polymer binder is a mixture of hydroxypropyl methylcellulose and polyacrylamide.   
   
   
       4 . The gas generant composition according to  claim 2 , wherein
 (D) the magnetic iron oxide is magnetic iron oxide having a spinel crystal structure.   
   
   
       5 . The gas generant composition according to  claim 2 , wherein
 (D) the magnetic iron oxide is powder having a specific surface area of 2.5 to 80 m 2 /g.   
   
   
       6 . The gas generant composition according to  claim 2 , further containing (E) a metal oxide other than the magnetic iron oxide. 
   
   
       7 . The gas generant composition according to  claim 6 , wherein
 (E) the metal oxide other than the magnetic iron oxide is at least one substance selected from CuO, Cu 2 O, ZnO, (α-Fe 2 O 3 , Mn 2 O 3  and Mn 3 O 4 .   
   
   
       8 . The gas generant composition according to  claim 6 , wherein
 the content of (A) the nitrogen-containing organic compound is 25 to 55 weight %, the content of (B) the metal nitrate and/or the perchlorate is 40 to 70 weight %, the content of (C) the water-soluble polymer binder is 2 to 10 weight %, the content of (D) the magnetic iron oxide is 1 to 5 weight %, and the content of (E) the metal oxide other than the magnetic iron oxide is 1 to 5 weight %.   
   
   
       9 . A compact of the gas generant composition according to  claim 1 . 
   
   
       10 . The compact according to  claim 9 , having magnetism. 
   
   
       11 . A small gas generator for a gas actuator for activating a safety device, using the gas generant composition according to  claim 1  or the compact of the gas generant composition according to  claim 9 .