초록 ▼

A stable, low-temperature ignition gas generating composition has a heating starting temperature of 170 to 220�� C. The gas generating composition includes ammonium perchlorate, a chlorine scavenger, and microcrystalline carbon powder. The chlorine scavenger is sodium nitrate or aluminun/magnesium m

A stable, low-temperature ignition gas generating composition has a heating starting temperature of 170 to 220�� C. The gas generating composition includes ammonium perchlorate, a chlorine scavenger, and microcrystalline carbon powder. The chlorine scavenger is sodium nitrate or aluminun/magnesium mixed powder, and the microcrystalline carbon powder is activated carbon or charcoal. The gas generating composition may include 40 to 58% by weight of ammonium perchlorate, 30 to 43% by weight of the chlorine scavenger, and 1 to 30% by weight of the microcrystalline carbon powder.

대표청구항 ▼

The invention claimed is: 1. A gas generating composition generating a gas containing nitrogen gas, carbon dioxide gas and water vapor when burned and adapted to use with an aluminum container for accommodating the gas generating composition, the gas generating composition comprising: (a) ammonium

The invention claimed is: 1. A gas generating composition generating a gas containing nitrogen gas, carbon dioxide gas and water vapor when burned and adapted to use with an aluminum container for accommodating the gas generating composition, the gas generating composition comprising: (a) ammonium perchlorate which generates a chlorine-containing chemical species when burned, where the ammonium perchlorate is present at a weight percent greater than any other component; (b) a chlorine scavenger for trapping the chlorine-containing chemical species; and (c) a microcrystalline carbon powder fuel having a specific surface area in the range of 50 to 1300 m2/g and compounded at an amount adapted to lower self-ignition temperature of the gas generating composition, the microcrystalline carbon powder fuel being selected from the group consisting of activated carbon or charcoal. 2. The gas generating composition according to claim 1, wherein the chlorine scavenger includes at least one selected from the group consisting of alkali metal nitrate, alkali metal carbonate, aluminum powder, and magnesium powder. 3. The gas generating composition according to claim 1, wherein the sum of the amounts of the ammonium perchlorate and the chlorine scavenger is 70 to 99% by weight, and the amount of the microcrystalline carbon powder fuel is 1 to 30% by weight, in the gas generating composition. 4. The gas generating composition according to claim 1, wherein the chlorine scavenger is one of sodium nitrate and aluminum/magnesium mixed powder, and wherein the content of the ammonium perchlorate is 40 to 58% by weight, and the content of the chlorine scavenger is 30 to 43% by weight, and the content of the microcrystalline carbon powder fuel is 1 to 30% by weight, in the gas generating composition. 5. The gas generating composition according to claim 1, further comprising at least one additive selected from the group consisting of (d) a polymer binder, (e) an organic acid or a salt thereof, and (f) a combustion controlling agent. 6. The gas generating composition according to claim 5, wherein the additive is the combustion controlling agent and the combustion controlling agent is one of a high energy substance selected from the group consisting of trimethylenetrinitroamine, tetramethylenetetranitroamine, pentaerythritol tetranitrate, triaminoguanidine nitrate, and hydrazine nitrate and a decomposition catalyst for ammonium perchlorate. 7. The gas generating composition according to claim 5, wherein the chlorine scavenger is one of sodium nitrate and aluminum/magnesium mixed powder, the additive is the polymer binder, and the polymer binder is one of cellulose acetate butyrate and cellulose acetate, and wherein the content of the ammonium perchlorate is 40 to 53% by weight, the content of the chlorine scavenger is 29 to 38% by weight, the content of the microcrystalline carbon powder fuel is 5 to 20% by weight, and the content of the polymer binder is 4 to 15% by weight, in the gas generating composition. 8. The gas generating composition according to claim 1, wherein the amount of the microcrystalline carbon powder fuel is 7 to 20% by weight and the sum of the amounts of the ammonium perchlorate and the chlorine scavenger is 80 to 93% by weight with respect to total weight of ammonium perchlorate, the chlorine scavenger, and the microcrystalline carbon powder fuel. 9. The gas generating composition according to claim 1, wherein the gas generating composition is a low-temperature ignition type and the microcrystalline carbon powder fuel lowers the self-ignition temperature of the gas generating composition to a range of 170 to 220�� C. 10. A gas generator for air bag, comprising: a gas generating composition generating a gas containing nitrogen gas, carbon dioxide gas, and water vapor when burned, wherein the gas generating composition contains (a) ammonium perchlorate present in a weight percent greater than any other component, which generates a chlorine-containing chemical species when burned, (b) a chlorine scavenger for trapping the chlorine-containing chemical species, and (c) a microcrystalline carbon powder fuel having a specific surface area in the range of 50 to 1300 m2/g and compounded at an amount adapted to lower self-ignition temperature of the gas generating composition, the microcrystalline carbon powder fuel being selected from the group consisting of activated carbon and charcoal; and a container made of aluminum for accommodating the gas generating composition. 11. The gas generator according to claim 10, wherein the gas generating composition exhibits high-temperature stability characterized by a weight loss of 5% or less, when assessed by weighing a sample of the gas generating composition, setting the sample in a bottle in a constant temperature bath adjusted to 107�� C., allowing it to stand for 400 hours, taking the sample out from the bath, and weighing the resultant sample for the presence of decomposition and weight loss. 12. A gas generator for pretensioner, comprising: a gas generating composition generating a gas containing nitrogen gas, carbon dioxide gas, and water vapor when burned, wherein the gas generating composition contains (a) ammonium perchlorate present in a weight percent greater than any other component, which generates a chlorine-containing chemical species when burned, (b) a chlorine scavenger for trapping the chlorine-containing chemical species, and (c) a microcrystalline carbon powder fuel having a specific surface area in the range of 50 to 1300 m2/g and compounded at an amount adapted to lower self-ignition temperature of the gas generating composition, the microcrystalline carbon powder fuel being selected from the group consisting of activated carbon and charcoal; and a container made of aluminum for accommodating the gas generating composition. 13. The gas generator according to claim 12, wherein the gas generating composition exhibits high-temperature stability characterized by a weight loss of 5% or less, when assessed by weighing a sample of the gas generating composition, setting the sample in a bottle in a constant temperature bath adjusted to 107�� C., allowing it to stand for 400 hours, taking the sample out from the bath, and weighing the resultant sample for the presence of decomposition and weight loss.