Gas generants comprising transition metal nitrite complexes

C - Chemistry – Metallurgy – 06 – D

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C06D 5/04 (2006.01) C06B 25/00 (2006.01) C06D 5/06 (2006.01)

Patent

CA 2277023

High nitrogen gas generant compositions, useful for inflating passenger restraint gas inflator bags, comprise a nitrogen rich coordination compound selected from coordination complexes comprised of anionic nitro and nitrito ligands coordinated with a transitional metal template, and nonmetallic or nonmetallic/metallic cations. The gas generant compositions generate relatively more gas and less solids, and are safer than known gas generant compositions. Certain gas generant compositions ignite at lower autoignition temperatures thereby facilitating the use of an aluminum or light weight metal pressure vessel. Other gas generants self-deflagrate eliminating the need for other constituents in the composition. Novel methods for the synthesis of nonmetal derivative coordination complexes, guanidine and hydrazine for example, are also presented.

L'invention concerne des compositions génératrices de gaz à haute teneur en azote, utiles pour les sacs gonflables au gaz dans les systèmes gonflables de retenue pour passagers, renfermant un composé de coordination riche en azote choisi parmi les complexes de coordination du groupe des ligands anioniques nitro et nitrito coordonnés avec une matrice en métal de transition, et aussi des cations non métalliques ou non métalliques/métalliques. Ces compositions produisent relativement plus de gaz et moins de matières solides, et sont plus sûres que les compositions génératrices de gaz existantes. Certaines compositions s'enflamment à des températures d'auto-inflammation inférieures, ce qui facilite l'utilisation d'un récipient à pression en aluminium ou en métal léger. D'autres sont auto-déflagrantes, ce qui élimine la nécessité d'y ajouter des éléments supplémentaires. L'invention concerne également des procédés nouveaux pour la synthèse des complexes de coordination à dérivé non métallique (par exemple, guanidine et hydrazine).

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