GAS GENERATING COMPOSITIONS AND AIRBAG INFLATORS
First Claim
1. An airbag inflator comprising:
- (a) a metal housing; and
(b) a gas generant inside the metal housing, the gas generant comprising;
(i) greater than 1 and less than 5 wt. % mica;
(ii) a primary fuel selected from the group consisting of guanidine compounds;
(iii) a secondary fuel at levels of less than 5% by weight selected from the group consisting of tetrazoles, triazoles and mixtures thereof; and
(iv) an oxidizer system comprising at least two compounds selected from the group consisting of transition metal oxides, alkali metal nitrates and alkaline earth metal nitrates.
3 Assignments
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Accused Products
Abstract
Airbag inflators employ gas generating compositions formed from a mixture of fuels and a mixture of oxidizers and preferably mica at levels of 1 to 5% by weight. The gas generant composition contains a primary and secondary fuel. The primary fuel is a guanidine compound, preferably guanidine nitrate. The secondary fuel is selected from tetrazoles, triazoles and mixtures thereof at levels of 5% by weight or less of the total gas generant composition. The oxidizer system is a mixture of at least two components selected from the group consisting of transition metal oxides, alkali metal nitrates and alkaline earth metal nitrates. The novel gas generants yield inflating gases having a reduced content of undesirable gases such as nitrous oxides and carbon monoxide.
30 Citations
19 Claims
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1. An airbag inflator comprising:
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(a) a metal housing; and (b) a gas generant inside the metal housing, the gas generant comprising; (i) greater than 1 and less than 5 wt. % mica; (ii) a primary fuel selected from the group consisting of guanidine compounds; (iii) a secondary fuel at levels of less than 5% by weight selected from the group consisting of tetrazoles, triazoles and mixtures thereof; and (iv) an oxidizer system comprising at least two compounds selected from the group consisting of transition metal oxides, alkali metal nitrates and alkaline earth metal nitrates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A gas generant composition comprising:
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(a) a primary and secondary fuel ranging from about 30 to 70% by weight of the gas generant composition, said primary fuel is a guanidine compound ranging from about 30 to 70% by weight of the gas generant composition and said secondary fuel is a tetrazole or triazole or mixtures thereof ranging from about 1 to 5% by weight of the gas generant composition; (b) an oxidizer system comprising at least two components, said oxidizer system ranging from about 30 to 70% by weight of said gas generant composition, wherein said oxidizer system consists of (i) a transition-metal oxide ranging from about 5 to 15% by weight of the gas generant composition; and
(ii) an alkali metal nitrate, an alkaline-earth metal nitrate, or mixtures thereof, wherein said alkali metal nitrate, alkaline-earth metal nitrate or mixtures thereof range from about 30 to 70% by weight of the gas generant composition; and(c) from 1 to less than 5% by weight of the gas generant composition of mica. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An airbag inflator comprising:
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(a) a metal housing; and (b) a gas generant located in the metal housing, the gas generant comprising; (i) greater than 1 and less than 5 wt. % mica; (ii) a primary fuel selected from the group consisting of guanidine compounds; (iii) a secondary fuel selected from the group consisting of 5-amino tetrazole, bitetrazole, 3-nitro-1,2,4-thiazol-5-one and mixtures thereof.
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19. A gas generant composition consisting of:
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(a) 35 to 45 weight % guanidine nitrate; (b) 25 to 35 weight % strontium nitrate; (c) 2 to 10 weight % cupric oxide; (d) 2 to 10 weight % potassium nitrate; (e) 1 to 5 weight % 5-amino tetrazole; (f) 1 to 5 weight % boron nitride; (g) 1 to 5 weight % mica; and (h) processing aids.
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Specification