Autoignition/booster composition

Inactive Publication Date: 2007-02-15
AUTOMOTIVE SYST LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The above-referenced concerns and others may be resolved by gas generating systems including an autoignition composition containing a first oxidizer selected from metal chlorates, such as potassium chlorate, a carboxylic acid or dicarboxylic acid as a primary fuel, a secondary oxidizer selected from metal and nonmetal nitrates, nitrites, oxides, basic metal nitrates, and other known oxidizer

Problems solved by technology

An ongoing challenge is to simplify the manufacture of a gas generator by reducing the constituents required in the production thereof.
Nevertheless, these types of compositions typically do not provide anything but auto-ignition function when employed in gas generators used in vehicle occupant protection systems, for example.

Method used

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  • Autoignition/booster composition
  • Autoignition/booster composition
  • Autoignition/booster composition

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0014] An exemplary formulation was provided that functions as a booster, an autoignition, and a gas generant composition. The formulation contains 5-aminotetrazole at about 19.0 wt%, DL-tartaric acid at about 20.0 wt%, strontium nitrate at about 35.0 wt%, and potassium chlorate at about 26.0 wt%. The constituents were previously and separately ground to a relatively small size in a known manner. They were then dry-mixed to form a substantially homogeneous composition. The composition autoignited at about 140 C. as measured by DSC analysis. The propellant formed from the constituents resulted in an approximate 67% gas yield. The impact sensitivity of this formulation had an HD50 of 11.5 inches as conducted in conformance with the Bruceton Test. The composition was aged for about 480 hours at 107C. and still autoignited at about 145.1C. as determined by DSC analysis.

example 3

[0015] An exemplary formulation was provided that functions as a booster, an autoignition, and a gas generant composition. The formulation contains 5-aminotetrazole at about 19.0 wt%, DL-tartaric acid at about 19.0 wt%, strontium nitrate at about 50.0 wt%, and potassium chlorate at about 12.0 wt%. The constituents were granulated and dry-mixed to form a substantially homogeneous composition. The composition autoignited at about 141 C. as measured by DSC analysis. The propellant formed from the constituents resulted in an approximate 68.2% gas yield. The impact sensitivity of this formulation had an HD50 of 8.8 inches as conducted in conformance with the Bruceton Test. As shown in FIG. 3, the composition reflected a relatively strong burn rate across several pressure regimes, and in particular indicated burn rates of over 0.8 inches per second (ips). Again referring to FIG. 3, it can be seen that the composition exhibited a burn rate of about 0.2 ips at about 200 psig, about 0.35 ips...

example 4

[0016] An exemplary formulation was provided that functions as a booster, an autoignition, and a gas generant composition. The formulation contains DL-tartaric acid at about 28.0 wt%, strontium nitrate at about 32.0 wt%, and potassium chlorate at about 30.0 wt%. The constituents were previously and separately ground to a relatively small size in a known manner. They were then dry-mixed to form a substantially homogeneous composition. The composition autoignited at about 153 C. as measured by DSC analysis. The propellant formed from the constituents resulted in an approximate 66.1% gas yield. The impact sensitivity of this formulation had an HD50 of 8.1 inches as conducted in conformance with the Bruceton Test.

[0017] As indicates in Examples 1-4, compositions formed in accordance with the present invention (Examples 2-4) preferably autoignite at or below about 180C. and provide a booster function as well. The compositions of the present invention may also produce substantial quantit...

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Abstract

A gas generator 10 includes a composition that contains a metal chlorate such as potassium chlorate as an oxidizer, a carboxylic acid such as DL-tartaric acid as a primary fuel, a secondary oxidizer such as strontium nitrate, and if desired, a secondary fuel such as 5-aminotetrazole. Gas generating systems 180 such as vehicle occupant protection systems 180, containing the gas generator 10, are also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application Ser. No. 60 / 703,998 filed on Jul. 29, 2005.TECHNICAL FIELD [0002] The present invention relates generally to gas generating systems, and to autoignition compositions employed in gas generator devices for automotive restraint systems, for example. BACKGROUND OF THE INVENTION [0003] The present invention relates to autoignition compositions that upon ignition provide the flame front and pressure front necessary to safely ignite gas generant compositions in combustible communication therewith. As known in the art, gas generators are typically provided with an autoignition composition that in the event of a fire ignites responsive to a desired threshold temperature. As a result, the gas generant is ignited prior to melting for example, thereby safely igniting the main gas generant composition to inhibit or prevent the likelihood of an explosive event once the gas generant b...

Claims

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Application Information

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IPC IPC(8): C06B47/08
CPCC06D5/06C06C9/00
Inventor HORDOS, DEBORAH L.
Owner AUTOMOTIVE SYST LAB
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