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Gas-generating agent composition comprising triazine derivative

Inactive Publication Date: 2003-02-06
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a toxicity to human bodies [LD.sub.50 (oral-rat)=27 mg / kg] or hazard in handling of sodium azide has been regarded as a serious problem.
However, the non-azide based gas generating composition is problematic in combustion temperature, burning rate, phase transfer, amounts of generated carbon monoxide and nitrogen oxides, a gas output and the like.
For example, the gas generating composition of U.S. Pat. No. 4,369,079 has a high combustion temperature, and requires a large amount of a coolant in actual use.
In the gas generating agent of JP-A 10-72273, a shape of the molded article is changed due to phase transfer of ammonium nitrate in the range of the use temperature, which damages a molded article of the gas generating agent, and in result, stable combustion cannot be conducted.
However, these compounds are all hazardous materials, and much care must be taken in view of a safety when handling the same.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 19 to 24

[0045] Gas generating compositions each having a formulation shown inTable2we reproduced. These compositions were tested for a friction sensitivity and a drop hammer sensitivity according to the explosives performance test method of JIS K 4810-1979. The results are shown in Table 2.

2 TABLE 2 Friction Drop hammer sensitivity sensitivity Formulation (wt. %) (kgf) (cm) Ex. 19 melamine / BCN / CMCNa = 19.80 / 77.20 / 3 >36.0 >100 Ex. 20 melamine / BCN / CMCNa / Co.sub.3O.sub.4 = >36.0 >100 17.18 / 69.82 / 3 / 10 Ex. 21 melamine / BCN / CMCNa / Al(OH).sub.3 = >36.0 >100 16.72 / 70.28 / 3 / 10 Ex. 22 melamine / BCN / CMCNa / Japanes-e acid >36.0 >100 clay = 20.80 / 76.20 / 3 / 5 Ex. 23 melamine / BCN / CMCNa / SiO.sub.2 = >36.0 >100 20.80 / 76.20 / 3 / 5 Ex. 24 melamine / BCN / CMCNa / mica = >36.0 >100 20.80 / 76.20 / 3 / 5

[0046] In Examples 19 to 24, the friction sensitivity exceeded 36.0 kgf, and the drop hammer sensitivity exceeded 100 cm. Accordingly, it was identified that the safety in handling was high.

examples 25 to 30

[0047] Gas generating compositions each having a formulation shown in Table 3 were produced. With respect to these compositions, a melting temperature, a temperature at which to start thermal decomposition and a temperature at which to start TGweight loss were measured with a TAS-type differential thermal analyzer manufactured by Rigaku K.K. A rate of temperature rise in the measurement was 20.degree. C. / min, a measurement atmosphere was a nitrogen gas, and an amount of a sample in the measurement was 1 to 2 mg. The results are shown in Table 3.

3 TABLE 3 Temperature at which to Temperature Melting start thermal at which to temperature decomposition start weight Formulation (wt. %) (.degree. C.) (.degree. C.) loss (.degree. C.) Ex. 25 melamine / BCN = 25 / 75 210 237 230 Ex. 26 melamine / BCN / CMCNa = 206 233 214 20.80 / 76.20 / 3 Ex. 27 melamine / BCN / CMCNa / Co.s-ub.3O.sub.4 = 203 229 211 17.18 / 69.82 / 3 / 10 Ex. 28 melamine / BCN / CMCNa / Al(OH).sub.3 = 204 231 212 16.72 / 70.28 / 3 / 10 Ex. 29 THT / BCN = 23.4 / ...

examples 31 to 35

[0049] Gas generating compositions each having a formulation shown in Table 4 were produced. Each of these compositions was molded into a strand. A burning rate was measured in a nitrogen atmosphere at a pressure of 4,900, 6,860 or 8,820 kPa. A burning rate at 6,860 kPa and a pressure index of 4,900 to 8,820 kPa are shown in Table 4.

4 TABLE 4 Burning rate Pressure Formulation (wt. %) (mm / sec) index Ex. 31 melamine / BCN / CMCNa = 15.89 0.25 19.80 / 77.20 / 3 Ex. 32 melamine / BCN / CMCNa / Co.sub.3O.sub.4 = 15.26 0.18 17.99 / 74.01 / 3 / 5 Ex. 33 melamine / BCN / CMCNa / Co.sub.3O.sub.4 = 14.03 0.16 17.18 / 69.82 / 3 / 10 Ex. 34 melamine / BCN / Gum / Al(OH).sub.3 = 13.98 0.18 17.47 / 74.53 / 3 / 5 Ex. 35 melamine / BCN / Gum / Al(OH).sub.3 = 10.15 0.20 16.43 / 70.57 / 3 / 10

[0050] The respective values shown in Examples 31 to 35 reveal that the compositions meet the practical conditions as the gas generating composition for the inflator.

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Abstract

A gas generating composition for an air bag having a low toxicity, a high burning rate and a low combustion temperature is provided. It is a gas generating composition comprising (a) a triazine derivative, (b) a basic metal nitrate, and (c) a binder or (c) a binder and (d) an additive.

Description

FILED OF THE INVENTION[0001] The present invention relates to a gas generating composition suitable for an air bag restraining system of automobiles and the like, its molded article and an inflator for an air bag using the same.RELATED ART[0002] As a gas generating agent for an air bag as a passenger-protecting system in automobiles, a composition using sodium azide has been often used so far. However, a toxicity to human bodies [LD.sub.50 (oral-rat)=27 mg / kg] or hazard in handling of sodium azide has been regarded as a serious problem. Therefore, as safe non-azide based gas generating compositions, gas generating compositions containing various nitrogen-containing organic compounds have been developed to replace the above composition.[0003] For example, U.S. Pat. No. 4,909,549 discloses a composition comprising hydrogen-containing tetrazole or triazole compounds and an oxygen-containing oxidizing agent. U.S. Pat. No. 4,370,181 discloses a gas generating composition comprising a hyd...

Claims

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Application Information

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IPC IPC(8): B60R21/26B60R21/264C06B43/00C06D5/00C06D5/06
CPCB60R21/2644C06D5/06B60R21/26B60R21/263C05D5/00
Inventor WU, JIANZHOUYAMATO, YO
Owner DAICEL CHEM IND LTD
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