Temperature fuse

• US 20010042577A1
• Filed: 04/17/2001
• Published: 11/22/2001
• Est. Priority Date: 07/20/1996
• Status: Active Grant

• Current Assignee: Autoliv AB (Autoliv Incorporated)
• Original Assignee: Dagmar Schmittner, Klaus Redecker, Ulrich Bley, Waldemar Weuter
• Inventors: Redecker, Klaus, Bley, Ulrich, Weuter, Waldemar, Schmittner, Dagmar
• Granted Patent: US 6,453,816 B2
• Time in Patent Office: Days
• US Class Current: 149/36
• CPC Class Codes: C06B 25/34 the compound being a nitrated acyclic, alicyclic or heterocyclic amine
• CPC Class Codes: C06B 43/00 Compositions characterised by explosive or thermic constituents not provided for in groups C06B25/00 - C06B41/00
• CPC Class Codes: C06C 9/00 Chemical contact igniters; Chemical lighters

Abstract

A temperature fuse for gas-generating mixtures consists of substances or mixtures of substances that have lower detonation points or decomposition points than the gas-generating mixture. In particular, the temperature fuse contains substances or mixtures of substances that thermally decompose exothermically in a narrowly restricted temperature range. The evolution of heat that results ignites the gas-generating mixture.

Claims

1. Temperature fuse for gas-generating mixtures, characterised in that it consists of substances or mixtures of substances which have lower detonation points or decomposition points than the gas-generating mixture.

2. Temperature fuse in accordance with

claim 1

, characterised in that it contains substances or mixtures of substances which thermally decompose exothermically in a narrowly restricted temperature range and the evolution of heat which results in this connection ignites the gas-generating mixture.

3. Temperature fuse in accordance with

claim 1

or

2

, characterised in that it contains as a substance or mixture of substances at least one compound selected from the compound class of oxalates, peroxidisulphates (persulphates), permanganates, nitrides, perborates, bismuthates, formates, nitrates, sulphamates, bromates or peroxides and/or in that it contains iron oxide and/or ferrocene.

4. Temperature fuse in accordance with one of

claims 1

to

3

, characterised in that it contains, as oxalate, iron(II)oxalate dihydrate with a distinct decomposition point from 190°

C., ammonium-iron-(III)-oxalate, the double salt of ammonium oxalate and iron oxalate with decomposition temperatures of 160-170°

C.;

as peroxidisulphates (persulphates), ammonium persulphate, sodium persulphate or potassium persulphate;

as permanganates, sodium permanganate or potassium permanganate;

as formates, ammonium formate or calcium formate;

as a nitrate, ammonium nitrate;

as a sulphamate, ammonium sulphamate;

as a nitride, iron nitride;

as a bismuthate, sodium bismutate;

asia bromate, potassium bromate; and

/or as a peroxide, zinc peroxide.

5. Temperature fuse in accordance with one of

claims 1

to

4

, characterised in that it contains as a substance, at least one oxidizable component, preferably at least one explosive having low detonation or decomposition points, particularly preferably at least one explosive selected from calcium bistetrazolamine, 3-nitro-1,2,4-triazol-5-one (NTO), 5-aminotetrazole nitrate, nitroguanidine (NIGU) or bistetrazolamine.

6. Temperature fuse in accordance with one of

claims 1

to

5

, characterised in that it additionally contains at least one fuel and possibly at least one reducing agent.

7. Temperature fuse in accordance with

claim 6

, characterised in that it contains as a fuel at least one explosive, preferably selected from calcium bistetrazolamine, 3-nitro-1,2,4-triazol-5-one (NTO), 5-aminotetrazole nitrate, nitroguanidine (NIGU), guanidine nitrate or bistetrazolamine, and contains as a reducing agent at least one metal powder, preferably titanium powder.

8. Temperature fuse in accordance with

claim 1

or

2

, characterised in that it contains at least one explosive, preferably selected from calcium bistetrazolamine, 3-nitro-1,2,4-triazol-5-one (NTO), 5-aminotetrazole nitrate, nitroguanidine (NIGU), guanidine nitrate or bistetrazolamine, and at least one oxidizing agent, preferably selected from zinc peroxide, ammonium nitrate, potassium nitrate, sodium nitrate, strontium nitrate, potassium perchlorate or mixtures of these oxidizing agents, and possibly contains at least one metal powder, preferably titanium powder, as a reducing agent.

9. Use of the temperature fuse in accordance with one of

claims 1

to

8

in a homogeneous mixture with the gas-generating mixture.

10. Use in accordance with

claim 9

, characterised in that the temperature fuse constitutes 0.1 to 20% by weight, preferably 0.1 to 5% by weight, of the gas-generating mixture.

11. Use of the temperature fuse in accordance with one of

claims 1

to

8

separately from the gas-generating mixture.

12. Use of the temperature fuse in accordance with one of

claims 1

to

8

in the ignition device of the gas-generating mixture.

13. Use of the temperature fuse in accordance with one of

claims 1

to

8

in gas generators for motor vehicle safety systems.

14. Use of the temperature fuse in accordance with one of

claims 1

to

8

in pressure or safety elements.