Gas generating material
AssigneeTRW Vehicle Safety Systems Inc.
InventorsGeorge W. Goetz, Thomas H. Vos
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Abstract
A gas generating grain has a water-based particulate booster coating thereon. The coating comprises an alkali metal azide, a water-soluble inorganic oxidizer in approximately a stoichiometric proportion of oxidizer to azide, and a nucleating amount of a small particle size metal oxide, preferably selected from the group consisting of iron oxide, nickel oxide and aluminum oxide. The coating is applied to said grain from a water slurry and dried, and when dried has an average particle size of less than about 50 microns.
Claims36
A gas generating grain having a particulate booster coating thereon, said coating comprising an alkali metal azide, a water-soluble inorganic oxidizer in approximately a stoichiometric proportion of oxidizer to azide, and a water-insoluble metal oxide, said coating being applied to said grain as a water slurry and dried.
A gas generating grain having a particulate booster coating thereon, said coating comprising an alkali metal azide, a water-soluble inorganic oxidizer in approximately a stoichiometric proportion of oxidizer to azide, and a nucleating amount of a water-insoluble metal oxide, said coating being applied to said grain as a water slurry and dried and when dried having an average particle size of about 50 microns or less.
A method for making a gas generating grain having a booster coating thereon, comprising the steps of:
- (a) preparing said grain;
- (b) preparing a coating slurry comprising water, an alkali metal azide, a water soluble inorganic oxidizer, and a water-insoluble metal oxide;
- (c) immersing said grain in said coating slurry;
- (d) removing said grain from said coating slurry and drying said grain and the coating thereon.
Dependencies are inferred from the claim text.