BASIC METAL NITRATE, PROCESS FOR PRODUCING THE SAME AND GAS GENERATING AGENT COMPOSITION
First Claim
1. A method of improving thermal stability or ignition properties in a gas generating composition, said method comprising the steps of:
- (a) providing a basic metal nitrate having a decomposition temperature-improving particle diameter or ignition-property improving particle diameter in the range 0.5 to 40 μ
m; and
(b) combining from 40 to 90 weight-% of said basic metal nitrate with from 10 to 60 weight-% of nitroguanidine to form a gas generating composition comprising from 10 to 60 weight-% nitroguanidine and from 40 to 90 weight-% basic metal nitrate, said gas generating composition having improved thermal stability or improved ignition properties.
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Abstract
Provided is a basic metal nitrate suitable as an oxidizing agent for a gas generating agent, which is a basic metal nitrate having a good thermal stability and meeting at least one requirement of the following (a) to (d):
(a) a particle diameter of 0.5 to 40 μm; (b) a degree of crystallinity having 0.4 deg or less of a half band width of the peak in the X-ray analysis; (c) an initiation temperature of weight loss being 220° C. or higher according to TG-DTA analysis; and (d) an impurity content of 1,000 ppm or less based on Na atom. Further provided is a gas generating composition which has a low toxicity, a high burning rate and a low combustion temperature and which is used in a gas generator for an air bag. The gas generating composition comprises (a) tetrazole derivatives, guanidine derivatives or a mixture thereof, (b) a basic metal nitrate and (c) a binder and/or a slag-forming agent.
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Citations
10 Claims
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1. A method of improving thermal stability or ignition properties in a gas generating composition, said method comprising the steps of:
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(a) providing a basic metal nitrate having a decomposition temperature-improving particle diameter or ignition-property improving particle diameter in the range 0.5 to 40 μ
m; and(b) combining from 40 to 90 weight-% of said basic metal nitrate with from 10 to 60 weight-% of nitroguanidine to form a gas generating composition comprising from 10 to 60 weight-% nitroguanidine and from 40 to 90 weight-% basic metal nitrate, said gas generating composition having improved thermal stability or improved ignition properties. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification