# US 2009/0260730 A1 · Gas generant composition for gas actuator for activating safety device and gas generator for gas actuator using the same

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- Number: US 2009/0260730 A1
- Document ID: US20090260730A1
- Status: Published application
- Kind: A1
- Application number: 12/299,187
- Filed: 2007-04-27
- Published: 2009-10-22
- Earliest claimed: 2006-05-02
- Assignees: Nippon Kayaku Kabushiki Kaisha; Toda Kogyo Corporation
- Inventors: Ryoi Kodama; Nanao Horiishi
- Web page: https://patentgrep.com/patent/US20090260730A1

## CPC

- B60R 21/2644: {using only solid reacting substances, e.g. pellets, powder}
- C06B 23/007: {Ballistic modifiers, burning rate catalysts, burning rate depressing agents, e.g. for gas generating}
- C06D 5/06: by reaction of two or more solids
- F42B 3/04: for producing gas under pressure {(generators of inflation fluid especially adapted for vehicle air bags B60R21/26)}
- B60R 2021/26029: {Ignitors}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- C06B: EXPLOSIVES OR THERMIC COMPOSITIONS (blasting F42D); MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES (compounds in general C01, C07 or C08; {demolition agents based on cementitious or like materials C04B41/0009})
- C06D: MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART) (fuels C10)
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

Disclosed is a gas generant composition for a gas actuator used for activating a safety device, which contains (A) a nitrogen-containing organic compound, (B) a metal nitrate and/or a perchlorate, (C) a water-soluble polymer binder, and (D) a magnetic material. When compared with the conventional gas generant compositions, this gas generant composition is excellent in combustibility under low pressure conditions and reduced in CO gas generation during combustion. In this gas generant composition, (D) the magnetic material is preferably composed of a magnetic iron oxide. It is also preferable that (A) the nitrogen-containing organic compound is composed of one or more substances selected from nitroguanidine, guanidine nitrate, bitetrazole, azobistetrazole and 5-aminotetrazole; (B) the metal nitrate is composed of a metal salt selected from alkali metals and alkaline earth metals, while the perchlorate is composed of ammonium perchlorate or potassium perchlorate; (C) the water-soluble polymer binder is composed of a mixture of hydroxypropyl methylcellulose (HPMC) and a polyacrylamide; and (D) the magnetic iron oxide has a spinel crystal structure.

## Claims

### Claim 1

A gas generant composition for a gas actuator for activating a safety device, containing the following components (A) to (D):
(A) a nitrogen-containing organic compound, (B) metal nitrate and/or perchlorate, (C) a water-soluble polymer binder, and (D) a magnetic material.

### Claim 2 (depends on 1)

The gas generant composition according to claim 1, wherein
(D) the magnetic material is (D) magnetic iron oxide.

### Claim 3 (depends on 2)

The gas generant composition according to claim 2, wherein
(A) the nitrogen-containing organic compound is at least one substance selected from nitroguanidine, guanidine nitrate, bitetrazole, azobistetrazole and 5-aminotetrazole, (B) the metal nitrate is a metal salt selected from alkali metals and alkaline earth metals while the perchlorate is ammonium perchlorate or potassium perchlorate, and (C) the water-soluble polymer binder is a mixture of hydroxypropyl methylcellulose and polyacrylamide.

### Claim 4 (depends on 2)

The gas generant composition according to claim 2, wherein
(D) the magnetic iron oxide is magnetic iron oxide having a spinel crystal structure.

### Claim 5 (depends on 2)

The gas generant composition according to claim 2, wherein
(D) the magnetic iron oxide is powder having a specific surface area of 2.5 to 80 m2/g.

### Claim 6 (depends on 2)

The gas generant composition according to claim 2, further containing (E) a metal oxide other than the magnetic iron oxide.

### Claim 7 (depends on 6)

The gas generant composition according to claim 6, wherein
(E) the metal oxide other than the magnetic iron oxide is at least one substance selected from CuO, Cu2O, ZnO, (α-Fe2O3, Mn2O3 and Mn3O4.

### Claim 8 (depends on 6)

The gas generant composition according to claim 6, wherein
the content of (A) the nitrogen-containing organic compound is 25 to 55 weight %, the content of (B) the metal nitrate and/or the perchlorate is 40 to 70 weight %, the content of (C) the water-soluble polymer binder is 2 to 10 weight %, the content of (D) the magnetic iron oxide is 1 to 5 weight %, and the content of (E) the metal oxide other than the magnetic iron oxide is 1 to 5 weight %.

### Claim 9 (depends on 1)

A compact of the gas generant composition according to claim 1.

### Claim 10 (depends on 9)

The compact according to claim 9, having magnetism.

### Claim 11 (depends on 1, 9)

A small gas generator for a gas actuator for activating a safety device, using the gas generant composition according to claim 1 or the compact of the gas generant composition according to claim 9.