Gas generating composition

Abstract

The present invention is a gas generating composition including fuel and an oxidizing agent, which can be used for an inflator of a vehicle airbag apparatus, wherein the oxidizing agent includes basic copper carbonate, the gas generating composition having the content of the basic copper carbonate of more than 40% by mass and 60% by mass or lower, and satisfying the following requirements (a) to (c):(a) the burning rate is 7.0 mm / sec or above;(b) the gas output is 2.30 mol / 100 g or above; and(c) the calorific value per mol of generated gas is 100 kJ / mol or lower.

Description

TECHNICAL FIELD[0001]The present invention relates to a gas generating composition that can be used for an inflator of a vehicle airbag apparatus.BACKGROUND ARTS[0002]A combustion temperature of a gas generating agent needs to be reduced in order to obtain a small and light inflator for a vehicle airbag apparatus, which is highly demanded in recent years. However, reducing the combustion temperature of the gas generating agent often leads to a decrease in burning rate and an amount of generated gas. In order to mend this problem, a method for increasing the amount of the gas generating agent for charging an inflator is considered, but with this method, a small and light inflator cannot be obtained. In order to solve such a problem, it is desired to use “calorific value per mol of generated gas” as an index. It is normally desired that appropriate burning rate or gas output be realized, while keeping a calorific value per mol of generated gas of. approximately 100 kJ / mol or less.[000...

AI Technical Summary

Benefits of technology

[0040]The additive used in the present invention may be in such an amount that does not have a great impact on the advantageous effects of the present invention in the calorific value, the gas output and the burning rate. The content of the additive is preferably 0.5 to 30 parts by mass, more preferably 1 to 25 parts by mass, or even more preferably 2 to 20 parts by mass, with respect to a total of 100 parts by mass of the fuel and the oxidizing agent.

[0041]The gas generating composition according to the present invention satisfies the following requirements (a) to (c), and preferably, also satisfies a requirement (d):

[0042](a) The burning rate is preferably 7.0 mm / sec or above, or more preferably 7.4 mm / sec or above;

[0043](b) The gas output is 2.30 mol / 100 g or above, or more preferably 2.37 mol / 100 g or above;

[0044](c) The calorific value per mol of generated gas is 100 kJ / mol or lower, or more preferably 90 kJ / mol or lower; and

[0045](d) The combustion temperature is preferably 2000 K or lower, or more preferably 1800 K or lower.

Problems solved by technology

However, reducing the combustion temperature of the gas generating agent often leads to a decrease in burning rate and an amount of generated gas.

In order to mend this problem, a method for increasing the amount of the gas generating agent for charging an inflator is considered, but with this method, a small and light inflator cannot be obtained.