US2020002243A1PendingUtilityA1

Gas-generating pyrotechnic solid objects

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Assignee: ARIANEGROUP SASPriority: Dec 22, 2016Filed: Dec 20, 2017Published: Jan 2, 2020
Est. expiryDec 22, 2036(~10.4 yrs left)· nominal 20-yr term from priority
Inventors:Stéphane BesombesAurélien Doillon
C06D 5/06C06B 23/007C06B 21/0066C06B 23/001C06B 31/00C06B 25/34
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Claims

Abstract

Gas-generating pyrotechnic solid objects, the composition of which, free of binder and of explosive ingredient, expressed as weight percentages, contains from 35 to 50%, advantageously from 40 to 50%, of guanidine nitrate, from 35 to 50% of basic copper nitrate, from 0.5 to 6% of at least one compound chosen from alumina and inorganic titanates, the melting point of which is above 2100 K, and from 5 to 18% of at least one inorganic oxalate, chosen from sodium oxalate, tin oxalate, strontium oxalate, iron oxalate, copper oxalate and mixtures thereof.

Claims

exact text as granted — not AI-modified
1 . A gas-generating pyrotechnic solid object, the composition of which, expressed as weight percentages, contains:
 from 35 to 50% of guanidine nitrate,   from 35 to 50% of basic copper nitrate,   from 0.5 to 6% of at least one compound selected from the group consisting of alumina and inorganic titanates, the melting point of which is above 2100 K, and   from 5 to 18% of at least one inorganic oxalate, selected from the group consisting of sodium oxalate, tin oxalate, strontium oxalate, iron oxalate, copper oxalate and mixtures thereof;   said composition being free of binder and of explosive ingredient.   
     
     
         2 . The object as claimed in  claim 1 , wherein said at least one inorganic oxalate is selected from the group consisting of sodium oxalate, strontium oxalate and copper oxalate. 
     
     
         3 . The object as claimed in  claim 1 , the composition of which, expressed as weight percentages, contains:
 from 35 to 50% of guanidine nitrate,   from 35 to 45% of basic copper nitrate,   from 1 to 6%, advantageously 3 to 5%, of at least one compound selected from the group consisting of alumina and inorganic titanates, the melting point of which is above 2100 K, and   from 5 to 15% of at least one inorganic oxalate selected from the group consisting of sodium oxalate, tin oxalate and mixtures thereof.   
     
     
         4 . The object as claimed in  claim 1 , wherein said at least one inorganic titanate chosen is selected from the group consisting of strontium titanate, calcium titanate, aluminum titanate and mixtures thereof. 
     
     
         5 . The object as claimed in  claim 1 , the composition of which consists, for at least 98% by weight of said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s). 
     
     
         6 . The object as claimed in  claim 1 , wherein said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s) have median diameters of less than or equal to 20 μm. 
     
     
         7 . The object as claimed in  claim 1 , wherein the median diameter of one of said guanidine nitrate and basic copper nitrate is substantially higher than the median diameter of the other of said guanidine nitrate and basic copper nitrate. 
     
     
         8 . The object as claimed in  claim 1 , wherein the median diameter of one of said guanidine nitrate and basic copper nitrate is less than or equal to 1 μm whereas the median diameter of the other of said guanidine nitrate and basic copper nitrate is at least 5 μm. 
     
     
         9 . The object as claimed in  claim 1 , the composition of which contains alumina, wherein the median diameter of said alumina is less than or equal to 5 μm. 
     
     
         10 . The object as claimed in  claim 1 , the composition of which contains at least one inorganic titanate, the median diameter of which is less than 6 μm. 
     
     
         11 . A process for preparing the object as claimed in  claim 1 , which is a dry-route process, said process comprising a step of compacting a pulverulent mixture containing said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s) in a powdered form. 
     
     
         12 . The object as claimed in  claim 1 , which is in a form selected from the group consisting of granules, pellets and monolithic blocks. 
     
     
         13 . A pulverulent composition, which is a precursor of an object as claimed in  claim 1 . 
     
     
         14 . A gas generator, containing a gas-generating pyrotechnic solid charge, wherein said charge contains at least one object as claimed in  claim 1 . 
     
     
         15 . The object as claimed in  claim 1 , the composition of which, expressed as weight percentages, contains:
 from 40 to 50% of guanidine nitrate,   from 35 to 45% of basic copper nitrate,   from 3 to 5%, of at least one compound selected from the group consisting of alumina and inorganic titanates, the melting point of which is above 2100 K, and   from 5 to 13% of at least one inorganic oxalate selected from the group consisting of sodium oxalate, tin oxalate and mixtures thereof.   
     
     
         16 . The object as claimed in  claim 1 , the composition of which consists, for at least 99.5% by weight, of said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s). 
     
     
         17 . The object as claimed in  claim 1 , the composition of which consists, for 100% by weight, of said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s). 
     
     
         18 . The object as claimed in  claim 1 ,
 wherein said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and said inorganic oxalate(s) have median diameters of less than or equal to 20 μm;   wherein the median diameter of one of said guanidine nitrate and basic copper nitrate is substantially higher than the median diameter of the other of said guanidine nitrate and basic copper nitrate, and   wherein the median diameter of said alumina is less than or equal to 5 μm; and   wherein the median diameter of said at least one inorganic titanate is less than 6 μm.   
     
     
         19 . The object as claimed in  claim 1 , wherein said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and said inorganic oxalate(s) have median diameters of less than or equal to 20 μm; and wherein the median diameter of one of said guanidine nitrate and basic copper nitrate is less than or equal to 1 μm whereas the median diameter of the other of said guanidine nitrate and basic copper nitrate is at least 5 μm. 
     
     
         20 . A process for preparing the object as claimed in  claim 1 , which is a dry-route process, said process comprising a step of compacting a pulverulent mixture containing said guanidine nitrate, basic copper nitrate, alumina and/or inorganic titanate(s), and inorganic oxalate(s) in a powdered form; said step of compacting a pulverulent mixture being followed by a step selected from the group consisting of a step of granulation, a step of palletization, and a step of granulation followed by a step of palletization.

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