Gas generant composition

• US 6,302,979 B1
• Filed: 11/23/1999
• Issued: 10/16/2001
• Est. Priority Date: 12/21/1994
• Status: Expired due to Term

• Current Assignee: Daicel Chemical Industries Limited
• Original Assignee: Daicel Chemical Industries Limited
• Inventors: Tomiyama, Shogo, Matsuoka, Kazuyuki
• Primary Examiner(s): Nelson, Peter A.
• Application Number:
  US09/447,432
• Time in Patent Office: 693 Days
• Field of Search: 149/36, 149/45, 149/110, 149/114, 149/38
• US Class Current: 149/36
• CPC Class Codes: C06B 23/02 for neutralising poisonous gases from explosives produced during blasting
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: Y10S 149/11 Particle size of a component
• CPC Class Codes: Y10S 149/114 Inorganic fuel

Abstract

A gas generant is provided which decreases toxic components, in particular carbon monoxide and nitrogen oxides, in generated gas to a concentration practical as an air bag system for automobile.

A nitrogen-containing organic compound such as a compound containing amino group or amido group or a tetrazole derivative and a oxygen-containing inorganic oxidizer such as KNO₃, Sr(NO₃)₂ or KClO₄ are essential components. Therewith one or more metal oxides are contained in the mixed catalyst of the gas generant composition. The oxide is selected from manganese dioxide having a specific surface area not less than 50 m²/g; copper oxide having a specific surface area not less than 1 m²/g; molybdenum oxides such as molybdenum dioxide, molybdenum trioxide, molybdic acid and ammonium molybdate: and copper oxides, cobalt oxides, iron oxides and silver oxides.

Claims

1. A gas generant composition comprising a nitrogen-containing organic compound, an oxygen-containing inorganic oxidizer, and a copper oxide having a specific surface area not less than 1 m²/g and an average particle size of not more than 5 μ

.

2. The composition according to claim 1 wherein the copper oxide has an average particle size from 0.5 microns to 5 microns.

3. The composition according to claim 1 wherein the copper oxide is contained in an amount of 1 through 40% by weight of the composition.

4. The composition according to claim 1 wherein the copper oxide has a specific surface area from 1.5 m²/g to 100 m²/g.

5. The composition according to claim 1 wherein the nitrogen-containing organic compound is at least one selected from the group consisting of organic compounds containing amino group or amido group and tetrazole derivatives.

6. The composition according to claim 5 wherein the organic compound containing amino group or amido group is azodicarbonamide or dicyandiamide.

7. The composition according to claim 1 wherein the oxygen-containing inorganic oxidizer is at least one selected from the group consisting of KNO₃, Sr(NO₃)₂ and KClO₄.

8. The composition according to claim 1 wherein the oxygen-containing inorganic oxidizer is a mixture of Sr(NO₃)₂ and KClO₄.

9. The composition according to claim 1 wherein the nitrogen-containing organic compound is azodicarbonamide and the oxygen-containing inorganic oxidizer is KClO₄.

10. An airbag system wherein the composition according claim 1 is contained as the gas generant.

12. The composition according to claim 1, further comprising a decomposition promoter for accelerating the decomposition of the nitrogen-containing organic compound.

13. The composition according to claim 1, wherein the nitrogen-containing organic compound is an organic compound containing an amino group or a tetrazole derivative.

14. The composition according to claim 1, wherein the nitrogen-containing organic compound is dicyandiamide or aminotetrazole.

15. The composition according to claim 1, wherein the nitrogen-containing organic compound is an organic compound containing an amino group.

11. A gas generant composition comprising a nitrogen-containing organic compound, an oxygen-containing inorganic oxidizer, and a copper oxide having a specific surface area not less than 1 m²/g and an average particle size of not more than 5 μ

;

wherein the composition does not include an alkali metal salt or alkaline earth metal salt of hydrazoic acid.