Explosive and thermic compositions or charges – Structure or arrangement of component or product – Solid particles dispersed in solid solution or matrix
Patent
1991-06-25
1993-08-17
Miller, Edward A.
Explosive and thermic compositions or charges
Structure or arrangement of component or product
Solid particles dispersed in solid solution or matrix
149 35, C06B 4506
Patent
active
052365263
ABSTRACT:
The present invention relates to pyrotechnic compositions generating nontoxic gases intended to inflate, in the event of an accident, the protective cushions for the occupants of a motor vehicle.
The compositions according to the invention contain an azide, an inorganic oxidising agent and, characteristically, between 5% and 40% by weight of an inorganic binder which is the product of an inorganic polycondensation reaction of mixtures based on alkali metal silicoaluminates. The binder is preferably the product of polymerisation of a silicoaluminate of formula (Si.sub.2 O.sub.5.Al.sub.2 O.sub.2) and of silica SiO.sub.2 in the presence of aqueous sodium hydroxide and/or of aqueous potassium hydroxide.
After the various constituents of the composition have been mixed and formed, the polymerisation of the said binder is ensured in a first stage by heating in a leakproof closed vessel and the drying of the composition is ensured in a second stage.
The compositions with inorganic binder according to the invention exhibit a mechanical strength and a moisture resistance which are superior to those exhibited by equivalent compositions without binder.
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Miller Edward A.
S.N.C. Livbag
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