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Gas generating composition

a technology of gas generating composition and composition, which is applied in the direction of explosives, vehicle components, pedestrian/occupant safety arrangements, etc., can solve the problems of high-temperature liquid or solid residue damage to bags, low gas output, and large amount of combustion residu

Inactive Publication Date: 2003-10-16
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The composition achieves high gas output, low toxicity, and improved safety with reduced residue generation, allowing for a stable and efficient air bag inflator that can be downsized and maintains performance over time.

Problems solved by technology

Thus, in either case, there is a problem that a gas output is low.
Further, large amounts of residues are generated in the combustion.
Accordingly, when residues generated are released as such from an inflator, high-temperature liquid or solid residues might damage a bag and a bag might be separated from an air bag module or burned.
In addition, it is sometimes harmful in breathing of passengers.
However, this method is against downsizing of an inflator and reduction of its weight, and also increases the production cost.
Besides, the composition containing phase-stabilized ammonium nitrate and nitroguanidine has a high initiation sensitivity, which is problematic in the safety of the production of the gas generating agent.
Moreover, the gas generating composition made of ammonium nitrate, tetrazoles and a metal oxide, disclosed in JP-A 10-72273, is hard to mold because of the absence of a high polymer, and cannot endure a volume change when a phase of ammonium nitrate is changed, making it difficult to control combustion of the gas generating agent after the lapse of a long period of time.
However, these gas generating agents are problematic in that a large amount of hazardous carbon monoxide is generated in the combustion.
Further, since a burning rate is low, it is difficult to simply apply the same to gas generating agents for an air bag of automobiles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0041] This invention is illustrated specifically with reference to the following Examples. However, this invention is not limited to these Examples only. Incidentally, in Tables 1 to 3 below, PAA indicates polyacrylamide, CMCNa indicates sodium carboxymethyl cellulose, AN indicates ammonium nitrate, CMCNH.sub.4 indicates ammonium carboxymethyl cellulose, BHTK indicates bitetrazole potassium salt, BHTNa indicates bitetrazole sodium salt, BHTNH.sub.3 indicates bitetrazole ammonium salt, C indicates carbon, CuO indicates copper oxide, and PSAN indicates phase-stabilized ammonium nitrate (AN / KClO.sub.4:90 / 10) . A composition ratio is expressed in terms of % by weight.

examples 14 to 17

[0043] Gas generating compositions each having a formulation shown in Table 2 were produced. With respect to these sensitivity according to an explosives performance test method of JIS K 4810-1979 were measured. The results are shown in Table 2.

[0044] In all examples, the friction sensitivity and the drop hammer sensitivity were much higher than 21 kgf and 30 cm respectively, deemed to be low sensitivities. The invention this way found to have a high safety.

example 18

[0045] A gas generating composition having a formulation of PAA / AN / BHTK (8 / 83.5 / 8.5) was produced. This composition was molded into a strand having a diameter of 9.6 mm and a height of 12.5 mm. This strand was placed into a thermostat bath of 105.degree. C., and a weight reduction ratio after the lapse of 400 hours was measured. As a result, the weight reduction ratio was 0.10%, and it was identified that the thermal stability was high.

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PUM

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Abstract

A gas generating composition which is excellent in a combustion efficiency and a gas output and in which amounts of residues generated are reduced in the combustion is obtained. A gas generating composition comprising (a) 5 to 40% by weight of at least one high polymer selected from the group consisting of a polyacrylic derivative resin, a polyacetal, a urea resin, a melamine resin, a ketone resin and a cellulose-based high polymer, and (b) 60 to 95% by weight of ammonium nitrate or phase-stabilized ammonium nitrate. It is suitable as a gas generating agent for an air bag of automobiles.

Description

TECHNICAL FIELD TO WHICH THE INVENTION BELONGS[0001] This invention relates to a gas generating composition which is suited for an air bag restraining system of automobiles, and an inflator for an air bag using the same.PRIOR ART[0002] As a gas generating agent for an air bag as a passenger protecting device in automobiles, gas generating agents containing various nitrogen-containing organic compounds being safer non-azide compound fuels that replace sodium azide have been developed.[0003] For example, U.S. Pat. No. 4,909,549 discloses a composition of hydrogen-containing tetrazole and triazole compounds and an oxygen-containing oxidizing agent; U.S. Pat. No. 4,369,079 discloses a composition of a hydrogen-free bitetrazole metal salt and an oxygen-containing oxidizing agent; and JP-A 6-239683 discloses a composition of carbohydrazide and an oxygen-containing oxidizing agent. Most of these non-azide gas generating compositions are made of nitrogen-containing organic compound fuels su...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60R21/26B60R21/264C06B31/30C06B31/54C06D5/00C06D5/06
CPCC06D5/06C06B31/30
Inventor WU, JIANZHOU
Owner DAICEL CHEM IND LTD
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