Compositions – Oxidative bleachant – oxidant containing – or generative – Free halogen or oxy-halogen acid type
Patent
1996-08-28
2000-10-24
Anthony, Joseph D.
Compositions
Oxidative bleachant, oxidant containing, or generative
Free halogen or oxy-halogen acid type
149 192, 149 23, 149 36, 149 38, 149 42, 149 43, 149 45, 149 75, 556 57, 556138, 556170, 556146, 556181, 564 34, C01B 1114, C06B 4510, C06B 4100
Patent
active
061362247
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INDUSTRIAL APPLICATION
The present invention relates to a gas generant composition which becomes an operating gas in an air bag system for protecting human bodies being mounted in automobiles, aircrafts or the like.
PRIOR ART
At present sodium azide is known as a gas generant used for an air bag system. A gas generant composition using sodium azide has no specific problems on the combustive characteristics thereof and is widely brought into a practical use. However, sodium azide has substantially unfavorable defects. For example, many patent publications in this field point out that a risk of decomposition and explosion, a formation of explosive compounds by reaction with heavy metals and environmental pollution problems which are worried at disposing in large quantities of sodium azide.
Therefore, means for solving these problems have been investigated, i.e., compounds have been investigated as a substitute for sodium azide. For example, a gas generant containing a complex of transition metals of an aminoalazol is disclosed in JP-A-5-213687, and a gas generant containing a carbodihydrazide is disclosed in JP-A-6-239683. These gas generants improve the defects of gas generants using sodium azide. However, the problems on a practical use, for example, existing in slight amount of gas components such as CO, NO.sub.X and NH.sub.3 in the gas generants, can not be sufficiently solved.
Furthermore, in the prior art, a method for producing the final composition, as a gas generant composition, comprising gas generating component, oxidizing component and reaction accelerator mixed by physical mixing method has been much used. However, a lot of investigations are needed to solve the problem of a combustion lability caused by scatter of particle degree and physical mixed states, to overcome this problem and to obtain desired functions.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a gas generant composition for an air bag, which is improved on its defects by using sodium azide, solves the problems in a practical use such as exsisting in slight amount of gas components in generated gas, and further, overcomes the combustion lability caused by scatter of particle degree and physical mixed states to give stabilized combustion capability thereto.
The present inventors have intensively studied and found that the problems the above can be solved by using a molecular compound containing gas generating component, oxidant component and acelerator component in the state of molecular or mixed atoms in one molecular compound of the gas generant composition.
The present invention is a gas generant comprising a molecular compound containing (a) a gas generating component, (b) an oxidant component and (c) a reaction accelerator component in its one molecular.
Preferably, the molecular compound is represented by the composition formula (I): Ca, Cr, Cu, Zn, Mn, Fe, Co, Sr, Ni or another metals being capable to form the molecular compound of the composition formula (I); X is the gas generating component (a) representing a nitrogen-containing compound having 0 or 1 carbon atom; Y is the oxidant component (b) representing NO.sub.3, ClO.sub.4, Cl, I or another anions being capable to form the molecular compound of the composition formula (I); and, m and n are numbers determined by combinations of components (a), (b) and (c), usually m is a number of 1 to 3 and n is a number of 2 to 3].
More preferably, Y represents NO.sub.3, ClO.sub.4 or another anions of oxygen acid salts being capable to form the molecular compound of the composition formula (I). Furthermore, the molecular compound is selected from the group consisting of the following compounds.
More preferably, the molecular compound is a metal complex of carbodihydrazide, further, M is Cu, Co, Ni, Mn or Zn, Y is NO.sub.3, Cl or I, X is a carbodihydrazide (CDH), n is 2 and m is a number of 1 to 3. Most preferably, X is NO.sub.3.
The present invention provides further a gas generant composition comprising a co-oxidant as a physically mixing
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Hirata Norimasa
Wu Jianzhou
Yokoyama Takushi
Anthony Joseph D.
Daicel Chemical Industries Ltd.
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