Nitrocellulose-free gas-generating composition
AssigneeTRW Airbag Systems GmbH
InventorsSiegfried Zeuner, Roland Schropp, Achim Hofmann, Karl-Heinz Rodig
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Abstract
A nitrocellulose-free, gas-generating composition for use in vehicle occupant restraint systems, in particular in a belt tensioner gas generator, substantially consists of at least one nitrogen-containing organic fuel in a proportion of 55 to 70% by weight, an inorganic oxidator in a proportion of 30 to 45% by weight, at least one combustion moderator in a proportion of up to 10% by weight and up to 5% by weight conventional adjuvants and additives, each in relation to the overall weight of the composition. The composition has a pressure exponent of less than 0.35 and a combustion rate at 200 bar of at least 40 mm/s.
Claims25
A nitrocellulose-free, gas-generating composition for use in vehicle occupant restraint systems, said composition consisting essentially of
- at least one nitrogen-containing organic fuel in a proportion of 55 to 70% by weight,
- an inorganic oxidator in a proportion of 30 to 45% by weight,
- at least one combustion moderator in a proportion of up to 10% by weight and
- up to 5% by weight conventional adjuvants and additives, each in relation to the overall weight of said composition,
- said composition having a pressure exponent of less than 0.35 and a combustion rate at 200 bar of at least 40 mm/s.
A gas-generating composition for use in vehicle occupant restraint systems, said composition consisting of
- at least one nitrogen-containing organic fuel in a proportion of 55 to 70% by weight,
- an inorganic perchlorate in a proportion of 30 to 45% by weight,
- at least one oxygen-containing compound of Cu in a proportion of 2 to 5% by weight and
- up to 2% by weight conventional adjuvants and additives, each in relation to the overall weight of said composition,
- wherein said nitrogen-containing organic fuel consists of 75 to 90% by weight of guanidine nitrate in admixture with 10 to 25% by weight of at least one further compound selected from the group consisting of nitroguanidine, nitrotriazolon, hexogen, octogen, ethylene diamine dinitrate, triaminoguanidine nitrate, azobisformamidine dinitrate, each in relation to the fuel, and
- wherein said composition has a pressure exponent of less than 0.35 and a combustion rate at 200 bar of at least 40 mm/s.
A method of agitating a belt-tensioner of a vehicle occupant restraint system, characterized by the step of agitating the belt-tensioner with gaseous combustion products generated by combustion of a nitrocellulose-free composition, said composition consisting essentially of
- at least one nitrogen-containing organic fuel in a proportion of 55 to 70% by weight,
- an inorganic oxidator in a proportion of 30 to 45% by weight,
- at least one combustion moderator in a proportion of up to 10% by weight and
- up to 5% by weight conventional adjuvants and additives, each in relation to the overall weight of said composition,
- wherein said composition has a pressure exponent of less than 0.35 and a combustion rate at 200 bar of at least 40 mm/s.
Dependencies are inferred from the claim text.