Trw Airbag Systems Gmbh & Co. Kg

Temic Bayern-chemie Airbag Gmbh

Trw Airbag Systems Gmbh

Karl-Heinz Rodig

Siegfried Zeuner

Achim Hofmann

Roland Schropp

Joachim Sans

Uwe Dolling

Armin Stark

Jorg Friedrich

The invention relates to gas generating compositions for use in safety devices for vehicles. In particular, the invention relates to said compositions based on guanidine nitrate used in pedestrian protection devices. The composition substantially comprises 75 to 98% by weight of guanidine nitrate as fuel and 2 to 25% by weight of a burn accelerator selected from the group of the transition metal compounds, the metal nitrates, metal chlorates, metal perchlorates, ammonium perchlorate and mixtures thereof, wherein the transition metal compounds are selected from the compounds of the transition metals Ti, Cr, Mn, Fe, Cu, Zn, Zr and Mo and wherein the gas generating composition exhibits a burn rate of from 3 to 17 mm/s at 20 MPa.

Gas generating composition and use thereof in pedestrian protection devices

The present invention provides a composition, in particular for use in safety devices for motor vehicles, which comprises a fuel mixture consisting of at least two components in a proportion of from 20 to 60% by weight and an oxidizer mixture consisting of at least three components in a proportion of from 40 to 80% by weight, relative to the total composition in each case. The composition is wherein the fuel mixture is composed of 5 to 95% by weight of a guanidine compound, 5 to 95% by weight of a heterocyclic organic acid, and 0 to 20% by weight of further fuels, relative to the fuel mixture in each case. According to the invention the oxidizer mixture is composed of 20 to 70% by weight of one or more transition-metal oxides, 10 to 50% by weight of basic copper nitrate, and 2 to 30% by weight of metal chlorate, metal perchlorate, ammonium perchlorate, alkali nitrate, alkaline-earth nitrate or mixtures thereof, relative to the oxidizer mixture in each case.

Azide-free gas-producing composition

The present invention relates to an azide-free gas-producing composition, in particular for use in safety devices for motor vehicles, comprising or consisting essentially of

The invention relates to a particle-free, gas-producing mixture for use in a gas generator for a safety device, in particular for a vehicle-occupant restraint system, with a total water content of the gas-producing mixture of at most 0.3%, consisting of:

Particle-free, gas-producing mixture

A gas-generating mixture for an air bag, which has a rate of burnoff exceeding 40 mm/sec and good ignitability, but leads to a relatively low combustion temperature. The mixture is formed of an alkali or alkaline earth azide as the principal component, a metal oxide as the oxidizing agent and slag-forming agent, and 5 to 23 wt. % of an accelerator consisting of a metal nitrate and silicon dioxide, wherein the ratio of the metal nitrate to the silicon dioxide ranges from 4:1 to 1:4, and the silicon dioxide content is at least 4 wt. % of the mixture.

Gas-generating mixture

The subject invention concerns a propellant mixture for producing propellant gas for passenger protection systems in motor vehicles, in particular airbag systems. According to this invention, this propellant mixture comprises fumaric acid, with a share of 20 to 45% by weight, as well as an inorganic oxidant with a share of 55 to 80% by weight. These revealed propellant components are non-toxic and characterized by a high thermal stability as well as low hygroscopicity. In addition, this propellant contains only minor traces of pollutant gases, with even combustion residues being non-toxic.

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Kraiburg, Germany

Karl-Heinz Rodig