Pyrotechnic composition for use as advanced ignition means
AssigneeTRW Airbag Systems GmbH
InventorsSiegfried Zeuner, Uwe Reimann, Roland Schropp, Karl-Heinz Roedig
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Abstract
A pyrotechnic composition, in particular for use in safety devices for motor vehicles, has an auto-ignition temperature between 140 and 180 degrees C., and comprises at least 3-nitro-1,2,4-triazol-5-one (NTO) in a proportion of 20 to 60% by weight. The NTO is stabilized by at least one of the following measures: (a) the NTO has an average grain size of 200 to 600 □m; and (b) the composition comprises an oil in an effective quantity for stabilizing the NTO. The pyrotechnic composition is adapted for use in a safety device, in particular in a safety device in motor vehicles.
Claims14
A pyrotechnic composition having an auto-ignition temperature between about 140 and 180 degrees C., said pyrotechnic composition comprising 3-nitro-1,2,4-triazol-5-on (NTO) in a proportion of 20 to 60% by weight, wherein said NTO is stabilized, said stabilized NTO comprising at least one of:
- (a) said NTO having an average grain size of between about 200 to 600 □m;
- and
- (b) an oil admixed to said composition in an effective quantity for reducing a reactivity of said NTO.
A gas generator for use in a safety device, in particular in a vehicle occupant restraint system, comprising a pyrotechnic propellant, an igniter for activating said pyrotechnic propellant, and an auto-ignition means associated with at least one of said pyrotechnic propellant and said igniter, said auto-ignition means consisting of a pyrotechnic composition having an auto-ignition temperature of between about 140 and 180 degrees C., said pyrotechnic composition comprising at least 3-nitro-1,2,4-triazol-5-on (NTO) in a proportion of about 20 to 60% by weight, wherein said NTO is stabilized, said stabilized NTO comprising at least one of:
- (a) said NTO, having an average grain size of about 200 to 600 □m;
- and
- (b) an oil admixed to said pyrotechnic composition in an effective quantity for reducing a reactivity of said NTO.
A method of activating a gas generator of an occupant restraint system in vehicles under vehicle fire conditions, said gas generator comprising a pyrotechnic propellant, an igniter for activating said pyrotechnic propellant and an auto-ignition means associated with at least one of said pyrotechnic propellant or said igniter, said method comprising the step of self-igniting said auto-ignition means at a temperature between about 140 to 180° C. thereby triggering a reaction of said pyrotechnic propellant, wherein said auto-ignition means consists essentially of a pyrotechnic composition comprising at least 3-nitro-1,2,4-triazol-5-on (NTO) in a proportion of 20 to 60% by weight, wherein said NTO is stabilized, said stabilized NTO comprising at least one of:
- (a) said NTO, having an average grain size of about 200 to 600 □m;
- and
- (b) an oil admixed to said pyrotechnic composition in an effective quantity for reducing a reactivity of said NTO.
Dependencies are inferred from the claim text.