Autoignition compositions for inflator gas generators
First Claim
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1. A gas generant composition consisting essentially of a mixture of:
- about 1% to 30% of a first oxidizer selected from the group consisting of alkali metal nitrites;
about 0% to 20% of an inert component selected from the group consisting of clay, diatomaceous earth, talc, silica, and alumina;
about 28% to 40% of a fuel component(s) selected from the group consisting of 1H-tetrazole, 5-aminotetrazole, 5-nitrotetrazole, 5-nitroaminotetrazole, 5,5'"'"'-bitetrazole, diguanidinium-5,5'"'"'-azotetrazolate, 3-nitro-1,2,4-triazole, 3-nitro-1,2,4-triazole-5-one, and salts and mixtures thereof; and
about 18% to 64% of a second oxidizer selected from the group consisting of alkaline earth nitrates and nitrites, and mixtures thereof,wherein said percentages are stated by weight of said mixture and said gas generant composition autoignites at or below 175°
C.
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Abstract
An autoignition composition for the gas generator of a vehicle occupant restraint system that is thermally stable at temperatures up to 110° C., autoignites between 150° C. and 175° C., produces minimal toxic gases upon combustion, provides for a reduced gas inflator size, and can be safely produced using simple processing methods. By mixing an alkali metal nitrite with a nitrogen-based fuel, the resulting gas generants autoignite at or below 175° C. The addition of an alkaline earth metal nitrite or nitrate provides the stability needed to additionally function as a booster and/or a gas generant.
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Citations
6 Claims
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1. A gas generant composition consisting essentially of a mixture of:
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about 1% to 30% of a first oxidizer selected from the group consisting of alkali metal nitrites; about 0% to 20% of an inert component selected from the group consisting of clay, diatomaceous earth, talc, silica, and alumina; about 28% to 40% of a fuel component(s) selected from the group consisting of 1H-tetrazole, 5-aminotetrazole, 5-nitrotetrazole, 5-nitroaminotetrazole, 5,5'"'"'-bitetrazole, diguanidinium-5,5'"'"'-azotetrazolate, 3-nitro-1,2,4-triazole, 3-nitro-1,2,4-triazole-5-one, and salts and mixtures thereof; and about 18% to 64% of a second oxidizer selected from the group consisting of alkaline earth nitrates and nitrites, and mixtures thereof, wherein said percentages are stated by weight of said mixture and said gas generant composition autoignites at or below 175°
C. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification