Pyrotechnic composition generating nontoxic gases, comprising an inorganic binder
US5236526A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Jun 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC06B35/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.