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Autoignition material and method

a technology of autoignition and materials, applied in the direction of ignitors, weapons, explosives, etc., can solve the problem that prior art generally fails to provide an autoignition material, and achieve the effect of reducing or preventing age-induced weight loss and enhancing aging characteristics

Inactive Publication Date: 2006-05-18
AUTOLIV ASP INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The invention provides an improved autoignition material that has enhanced aging characteristics and can ignite a gas generant material at a lower temperature. The material includes azodicarbonamide fuel and basic copper nitrate oxidizer in a specific ratio and a small amount of binder. The material has an equivalence ratio of less than 0.8, which means it is over-fueled and has more oxygen than needed to completely combust all hydrogen and carbon in the material. This results in a material that can withstand aging and has lower autoignition temperature increases. The invention also includes a method of igniting a gas generant material using the improved autoignition material.

Problems solved by technology

The prior art generally fails to provide an autoignition material, such as for use in an inflator device of an automotive inflatable restraint system, having enhanced aging characteristics.

Method used

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  • Autoignition material and method
  • Autoignition material and method

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examples

[0034] Autoignition materials were prepared having the compositions identified in TABLE 1 below. The autoignition materials in accordance with Comparative Example 1 (CE1) and Comparative Example 2 (CE2) each had an equivalence ratio (ER) of about 1.0 while the autoignition material of Example 1 (EX1), in accordance with the invention, was over-fueled, i.e., had an equivalence ratio of less than 0.8.

TABLE 1CE1CE2EX1Ethyl Cellulose2.004.002.00ADCA28.3423.2140.00BCN64.6667.7953.00Chabazite5.005.005.00ER1.001.000.78ADCA / BCN ratio0.440.340.75

ADCA = Azodicarbonamide

BCN = Basic copper nitrate

Test Methods and Data:

[0035] Samples of each of the autoignition materials were tested to determine the Autoignition Temperature (AIT), measured at heating rate of 10° C. / minute, before aging, after aging at 107° C. for 400 hours and after aging at 90° C. for 1000 hours. The autoignition temperatures were measured by placing samples of each material to be tested in a test tube held in an aluminum...

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Abstract

An autoignition material is provided which contains azodicarbonamide (ADCA) serving as a fuel and an oxidizer including at least basic copper nitrate (BCN) as an oxidizing agent for oxidizing the fuel, present in a ratio of ADCA to BCN of at least about 0.5, and a binder, present in a relative amount of no more than 5 weight percent of the autoignition material, serving as a binding agent for binding at least the fuel and the oxidizer, wherein the autoignition material has an equivalence ratio of less than about 0.8.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates generally to autoignition materials suitable for use in inflator devices such as are employed in automotive inflatable restraint systems and, more particularly, to autoignition materials having enhanced aging stability. [0002] Autoignition materials are useful in a variety of different contexts. One significant use for such compositions is in the operation of automotive inflatable restraint systems. It is well know to protect a vehicle occupant using a cushion or bag, e.g., an “airbag cushion” that is inflated or expanded with a gas when a vehicle experiences sudden deceleration, such as in the event of a collision. Such airbag restraint systems normally include: one or more airbag cushions, housed in an uninflated and folded condition to minimize space requirements; one or more crash sensors mounted on or to the frame or body of the vehicle to detect sudden deceleration of the vehicle; an activation system electronically tri...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B31/00
CPCC06C9/00
Inventor TAYLOR, ROBERT D.MENDENHALL, IVAN V.HESS, GREGORY B.
Owner AUTOLIV ASP INC
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