Treatment of airbag inflation gases

• US 6,051,158 A
• Filed: 07/30/1998
• Issued: 04/18/2000
• Est. Priority Date: 07/30/1998
• Status: Expired due to Fees

• Current Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Original Assignee: Autoliv ASP Incorporated (Autoliv Incorporated)
• Inventors: Taylor, Robert D., Mendenhall, Ivan V., Barnes, Michael W.
• Primary Examiner(s): Lovering, Richard D.
• Application Number:
  US09/124,868
• Time in Patent Office: 628 Days
• Field of Search: 252/67, 252/70, 264/122, 264/211, 75/303, 75/304, 280/728.1, 165/104.21
• US Class Current: 252/67
• CPC Class Codes: C06B 23/04 for cooling the explosion gases including antifouling and flash suppressing agents
• CPC Class Codes: C06D 5/06 by reaction of two or more solids
• CPC Class Codes: C09K 5/18 Non-reversible chemical reactions

Abstract

Chemical coolant formulations for treating the hot gas formed by an airbag inflator and corresponding methods of inflating an airbag cushion are provided. The chemical coolant formulations include a first ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component and a second ingredient which, when contacted by the hot gas, forms a liquid slag component. The solid and liquid slag components cooperate to form a unified slag mass.

Claims

1. A chemical coolant formulation for treating the hot gas formed by an airbag inflator, said chemical coolant formulation comprising:

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and t solid slag component,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component,

wherein the solid and liquid slag components cooperate to form a unified slag mass and

a binder effective to render the formulation extrudable, wherein said binder is a water compatible compound.

2. The chemical coolant formulation of claim 1 wherein said binder is selected from the group consisting of naturally occurring gums;

microbial produced gums, polyacrylamide, polyacrylic acid and salts, copolymers of polyacrylic acids and polyacrylamide, copolymers of polyacrylic salts and polyacrylamide, polyvinyl alcohol, hydroxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose and polyvinyl pyrrolidone.

3. The chemical coolant material of claim 1 additionally comprising an oxidizer present in a relative amount of up to about 60 weight percent.

4. The chemical coolant material of claim 3 wherein said oxidizer is selected from the group consisting of:

alkali metal nitrates, chlorates and perchlorates;

alkaline earth metal nitrates, chlorates and perchlorates;

CuO;

Fe₂ O₃ ;

CoO;

Co₃ O₄ ;

V₂ O₅ ;

ammonium nitrate;

ammonium perchlorate;

basic copper nitrate; and

mixtures thereof.

5. A chemical coolant formulation for treating the hot gas formed by an airbag inflator, said chemical coolant formulation comprising:

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component,

wherein the solid and liquid slag components cooperate to form a unified slag mass and

a binder effective to render the formulation extrudable, wherein said binder is selected from the group consisting of;

ethyl cellulose, carboxymethyl cellulose, cellulose acetate butyrate, cellulose acetate and other substituted cellulose derivatives.

6. A method for forming a chemical coolant, said method comprising:

extrusion processing of a coolant formulation including;

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component, and

a binder effective to render the formulation extrudable,

wherein the solid and liquid slag components cooperate to form a unified slag mass.

7. An extruded chemical coolant formulation for treating the hot gas formed by an airbag inflator, said extruded chemical coolant formulation comprising:

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component, and

a binder effective to render the formulation extrudable,

wherein the solid and liquid slag components cooperate to form a unified slag mass.

8. The extruded chemical coolant formulation of claim 7 wherein said first coolant ingredient is selected from the group consisting of metal carbonates, metal hydroxides, hydrated metal salts and mixtures thereof.

9. The extruded chemical coolant formulation of claim 7 wherein said second coolant ingredient comprises at least one alkali metal halogen salt.

10. The extruded chemical coolant formulation of claim 7 wherein said second coolant ingredient comprises a metal powder having a melting temperature of less than about 1000 K.

11. The extruded chemical coolant formulation of claim 7 wherein said second coolant ingredient comprises at least one alkali metal compound selected from the group of carbonates, bicarbonates, chlorates and perchlorates.

12. The extruded chemical coolant formulation of claim 7 wherein said binder is compatible with non-water solvents.

13. An extruded chemical coolant material comprising the chemical coolant formulation of claim 7, wherein the extruded material includes:

the first coolant ingredient present in a relative amount of about 25 weight percent to about 97 weight percent,

the second coolant ingredient present in a relative amount of about 1 weight percent to about 25 weight percent, and

the binder present in a relative amount of 2 weight percent to about 10 weight percent.

14. The extruded chemical coolant material of claim 13 additionally comprising at least one additive to improve the thermal conductivity of the extruded material, said additive present in a relative amount of up to about 10 weight percent.

15. The extruded chemical coolant material of claim 13 additionally comprising an oxidizer present in a relative amount of up to about 60 weight percent.

16. The extruded chemical coolant material of claim 15 wherein said oxidizer is selected from the group consisting of:

alkali metal nitrates, chlorates and perchlorates;

alkaline earth metal nitrates, chlorates and perchlorates;

CuO;

Fe₂ O₃ ;

CoO;

Co₃ O₄ ;

V₂ O₅ ;

ammonium nitrate;

ammonium perchlorate;

basic copper nitrate; and

mixtures thereof.

17. A method for forming a chemical coolant, said method comprising:

tableting processing of a coolant formulation including;

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component, and

a release aid effective to permit the release of the tableted material from a corresponding tablet forming device, the release aid present in a relative amount of about 0.5 weight percent to about 2 weight percent,

wherein the solid and liquid slag components cooperate to form a unified slag mass.

18. A tableted chemical coolant material for treating the hot gas formed by an airbag inflator, said tableted chemical coolant material comprising

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slat component, said first coolant ingredient present in a relative amount of about 63 weight percent to about 98.5 weight percent,

a second coolant ingredient which when contacted by the hot gas, forms a liquid slat component, and wherein the solid and liquid slag components cooperate to form a unified slag mass, said second cooling ingredient present in a relative amount of about 1 weight percent to about 25 weight percent, and

a release aid effective to permit the release of the tableted material from a corresponding tablet forming device, said release aid present in a relative amount of about 0.5 weight percent to about 2 weight percent.

19. The tableted chemical coolant material of claim 18 wherein said release aid is selected from the group consisting of:

calcium stearate, mica, molybdenum disulfide, lubricant grade graphite powder and combinations thereof.

20. The tableted chemical coolant material of claim 18 additionally comprising:

at least one additive to improve the thermal conductivity of the tableted material, said additive present in a relative amount of up to about 10 weight percent.

21. A tableted chemical coolant material for treating the hot gas formed by an airbag inflator, said tableted chemical coolant material comprising:

a first coolant ingredient which, when contacted by the hot gas, endothermically decomposes to form a cooling gas and a solid slag component, said first coolant ingredient present in a relative amount of about 63 weight percent to about 98.5 weight percent,

a second coolant ingredient which, when contacted by the hot gas, forms a liquid slag component, and wherein the solid and liquid slag components cooperate to form a unified slag mass, said second cooling ingredient present in a relative amount of about 1 weight percent to about 25 weight percent, and

a release aid effective to permit the release of the tableted material from a corresponding tablet forming device, said release aid present in a relative amount of about 0.5 weight percent to about 2 weight percent, wherein said release aid is a combination of calcium stearate and mica.