Gas-generating mixture
First Claim
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1. Gas-generator mixture for inflating air bags for protecting passengers in motor vehicles, the mixture consisting essentially of:
- 58-65 wt. % of an alkali or alkaline earth azide,10-35 wt. % of iron oxide having a specific surface greater than 5 m2 /g and a mean particle size less than 3 microns, and5-23 wt. % of an accelerator for increasing the rate of burnoff, formed of a metal nitrate and fumed silica, the fumed silica having a specific surface of at least 50 m2 /g,wherein the ratio of metal nitrate to the silica ranges from 4;
1 to 1;
4, the silica content of the mixture is at least 4 wt. %, 50 wt. % of the particles of the mixture have a size of less than 10 microns, and the mixture leads to a minimum output of very fine dust particles at a relatively low combustion temperature, and has a burnoff rate of more than 40 mm/sec as well as satisfactory ignitability.
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Abstract
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.
15 Citations
6 Claims
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1. Gas-generator mixture for inflating air bags for protecting passengers in motor vehicles, the mixture consisting essentially of:
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58-65 wt. % of an alkali or alkaline earth azide, 10-35 wt. % of iron oxide having a specific surface greater than 5 m2 /g and a mean particle size less than 3 microns, and 5-23 wt. % of an accelerator for increasing the rate of burnoff, formed of a metal nitrate and fumed silica, the fumed silica having a specific surface of at least 50 m2 /g, wherein the ratio of metal nitrate to the silica ranges from 4;
1 to 1;
4, the silica content of the mixture is at least 4 wt. %, 50 wt. % of the particles of the mixture have a size of less than 10 microns, and the mixture leads to a minimum output of very fine dust particles at a relatively low combustion temperature, and has a burnoff rate of more than 40 mm/sec as well as satisfactory ignitability. - View Dependent Claims (2, 3)
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4. Gas-generator mixture for inflating air bags for protecting passengers in motor vehicles, the mixture consisting essentially of:
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58-65 wt. % of an alkali or alkaline earth azide, 2- 30wt. % of iron oxide having a specific surface greater than 8 m2 /g and a mean particle size less than 1 micron, and 5-19 wt. % of an accelerator for increasing the rate of burnoff, formed of a metal nitrate and fumed silica, the fumed silica having a specific surface of at least 200 m2 /g, wherein the ratio of metal nitrate to the silica ranges from 4;
1 to 1;
4, the silica content of the mixture is at least 4 wt. %, 50 wt. % of the particles of the mixture have a size of less than 10 microns, and the mixture leads to a minimum output of very fine dust particles at a relatively low combustion temperature, and has a burnoff rate of more than 40 mm/sec as well as satisfactory ignitability. - View Dependent Claims (5, 6)
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Specification
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Current AssigneeTEMIC Bayern-Chemie Airbag GmbH
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Original AssigneeTEMIC Bayern-Chemie Airbag GmbH
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InventorsDolling, Uwe, Rodig, Karl-Heinz, Zeuner, Siegfried, Sans, Joachim
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Primary Examiner(s)Miller, Edward A.
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Application NumberUS08/246,551Time in Patent Office810 DaysField of Search149/35US Class Current149/35CPC Class CodesC06B 35/00 Compositions containing a m...C06D 5/06 by reaction of two or more ...
