Nonazide gas generant compositions

• US 5,872,329 A
• Filed: 11/08/1996
• Issued: 02/16/1999
• Est. Priority Date: 11/08/1996
• Status: Expired due to Term

• Current Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Khandhadia, Paresh S., Burns, Sean P.
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US08/745,949
• Time in Patent Office: 830 Days
• Field of Search: 149/36, 149/46, 149/47
• US Class Current: 149/36
• CPC Class Codes: C06D 5/06 by reaction of two or more solids

Abstract

High nitrogen nonazide gas compositions, useful in inflating passenger restraint gas inflator bags, comprise an amine salt of triazole or tetrazole fuel, and phase stabilized ammonium nitrate (PSAN) as an oxidizer. The combination of the amine azole salt and phase stabilized ammonium nitrate results in gas generants that are relatively more stable and less explosive, have improved ignitability and burn rates, and generate more gas and less solids than known gas generant compositions.

Claims

1. A gas generant composition useful for inflating an automotive air bag passive restraint system comprising a mixture of:

a high-nitrogen nonazide fuel selected from the class consisting of 1-, 3-, and 5-substituted amine salts of triazoles, and, 1- and 5-substituted amine salts of tetrazoles; and

dry-mixed with

an oxidizer selected from the group consisting of phase stabilized ammonium nitrate.

2. A gas generant composition as claimed in claim 1 wherein said fuel is employed in a concentration of 15 to 65% by weight of the gas generant composition, and, said oxidizer is employed in a concentration of 35 to 85% by weight of the gas generant composition.

3. A gas generant composition as claimed in claim 2 further comprising an inert combination slag former, binder, processing aid, and coolant selected from the group comprising clay, diatomaceous earth, alumina, and silica wherein said slag former is employed in a concentration of 0.1 to 10% by weight of the gas generant composition.

4. A gas generant composition as claimed in claim 1 further comprising an ammonium nitrate stabilizing agent selected from the group comprising potassium nitrate wherein said stabilizing agent is employed in a concentration of 10-15% by weight of the total phase stabilized ammonium nitrate.

5. A gas generant composition useful for inflating an automotive air bag passive restraint system comprising a mixture of:

a high-nitrogen nonazide fuel selected from the class consisting of 1-, 3-, 5-substituted amine salts of triazoles and 1- and 5-substituted amine salts of tetrazoles, said fuel employed in a concentration of 15 to 65% by weight of the gas generant composition; and

an oxidizer consisting of phase stabilized ammonium nitrate, said oxidizer employed in a concentration of 35 to 85% by weight of the gas generant composition,

wherein said fuel is selected from the group consisting of monoguanidinium salt of 5,5'"'"'-Bis-1H-tetrazole, diguanidinium salt of 5,5'"'"'-Bis-1H-tetrazole, monoaminoguanidinium salt of 5,5'"'"'-Bis-1H-tetrazole, diaminoguanidinium salt of 5,5'"'"'-Bis-1H-tetrazole, monohydrazinium salt of 5,5'"'"'-Bis-1H-tetrazole, dihydrazinium salt of 5,5'"'"'-Bis-1H-tetrazole, monoammonium salt of 5,5'"'"'-bis-1H-tetrazole, diammonium salt of 5,5'"'"'-bis-1H-tetrazole, mono-3-amino-1,2,4-triazolium salt of 5,5'"'"'-bis-1H-tetrazole, di-3-amino-1,2,4-triazolium salt of 5,5'"'"'-bis-1H-tetrazole, diguanidinium salt of 5,5'"'"'-Azobis-1H-tetrazole, and monoammonium salt of 5-Nitramino-1H-tetrazole.