The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Jun. 25, 1991
Christian Perotto, Ballancourt, FR;
S.N.C. Livbag, Vert le Petit, FR;
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.