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Gas generating composition for inflator containing melamine cyanurate

a technology of melamine cyanurate and gas generating composition, which is applied in the direction of looms, explosives, weaving, etc., can solve the problems of gas output, safety in handling, and large amount of generated carbon monoxide and nitrogen oxide in practical use, and achieve the effect of safe handling

Inactive Publication Date: 2010-04-01
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The composition achieves low toxicity, safe handling, and efficient combustion with reduced NO and CO emissions, along with enhanced burning rate and thermal stability, making it suitable for air bag inflators.

Problems solved by technology

However, as the toxicity to human body [LD50 (oral-tat)=27 mg / kg] and danger in handling of sodium azide is becoming problems, gas generating compositions containing various kinds of nitrogen-containing organic compounds have been developed as so-called non-azide based gas generating compositions which are safer alternatives.
The above non-azide based gas generating compositions, however, have problems in respect of combustion temperature, burning rate, phase transition, amounts of generated carbon monoxide and nitrogen oxide, gas output, safety in handling and the like.
The gas generating composition disclosed in U.S. Pat. No. 4,369,079 has a high combustion temperature, and hence require a large amount of coolant in practical use.
In the patents of non-azide based gas generating agents other than JP-A No. 2001-220282, tetrazoles, nitroguanidine, TAGN and the like are used as a fuel for gas generating agent, but they are dangerous substances and has to be handled with special attention.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0044]In the followings, the present invention will be described in detail by way of Examples, however, the present invention is not limited to these Examples.

examples 19 to 24

[0048]Gas generating compositions having compositions shown in Table 2 were produced. Friction sensitivity and drop hammer sensitivity of these compositions were tested according to the explosives performance test method of JIS K4810-1979. The results are shown in Table 2.

TABLE 2DropFrictionhummerCompositionsensitivitysensitivity(composition ratio: % by mass)(N)(cm)Examples 19MC / BCN / (26.16 / 73.84)>353>100Examples 20MC / BCN / CMCNa (23.09 / 73.91 / 3)>353>100Examples 21MC / BCN / CMCNa / Al(OH)3>353>100(22.31 / 71.69 / 3 / 3)Examples 22MC / GN / BCN / Al(OH)3>35360-70(20.3 / 10 / 64.7 / 5)Examples 23MC / GN / BCN / CMCNa / Al(OH)3>35360-70(9.71 / 20 / 60.29 / 5 / 5)Examples 24MC / Melamine / BCN / CMCNa>353>100(17.05 / 3 / 74.95 / 5)

[0049]In Examples 19 to 24, friction sensitivities exceeded 353 N and drop hammer sensitivities are more than 60 cm, suggesting that friction and drop hammer sensitivities are insensitive, and hence safety in handling is high.

examples 25 to 27

[0050]Gas generating compositions having compositions shown in Table 3 were produced. For these gas compositions, melting temperature, exothermic decomposition starting temperature and TG weight reduction starting temperature were measured using a TAS-type differential thermal analyzer (produced by Rigaku Corporation). The temperature raising speed during measurement was 20° C. / min, the measurement atmosphere was nitrogen gas, and the sample amount in measurement was 1 to 2 mg. The results are shown in Table 3.

TABLE 3ExothermicWeightdecompositionreductionCompositionMeltingstartingstarting(Composition ratio: %temperaturetemperaturetemperatureby mass)(° C.)(° C.)(° C.)Example 25MC (100)280—284Example 26MC / BCN (26.16 / 73.84)220250226Example 27MC / BCN / CMCNa210239212(23.09 / 73.91 / 3)

[0051]In Examples 25 to 27, melting temperature, exothermic decomposition starting temperature and weight reduction starting temperature were 200° C. or more, suggesting excellent thermal stability.

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Abstract

To provide a gas generating composition for air bag which is low in toxicity, large in burning rate, and low in combustion temperature. Gas generating compositions comprising (a) melamine cyanurate or a mixture of melamine cyanurate and nitrogen-containing organic compound and (b) oxygen-containing oxidant, and gas generating compositions comprising (c) binder and (d) additive are provided.

Description

[0001]This application is a Divisional of co-pending application Ser. No. 10 / 633,645, filed on Aug. 5, 2003, the entire contents of which are hereby incorporated by reference and for which priority is claimed under 35 U.S.C. §120. Ser. No. 10 / 633,645 application claims priority under 35 U.S.C. §119(e) on U.S. Provisional Application No. 60 / 401,761 filed on Aug. 8, 2002 and under 35 U.S.C. §119(a) on Patent Application No. 2002-227094 filed in Japan on Aug. 5, 2002, which are herein incorporated by reference.TECHNICAL FIELD TO WHICH THE INVENTION BELONGS[0002]The present invention relates to a gas generating composition which is suitable for air bag restraining system in automobiles and the like, its molded article and an air bag inflator using the same.PRIOR ART[0003]Conventionally, compositions using sodium azide have been often used as a gas generating agent for an air bag which serves as an occupant protecting apparatus in an automobile. However, as the toxicity to human body [LD...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B45/10C06B25/34C06B29/22C06B29/00C06B31/00C06B45/06C06B45/00C06B31/28C06D5/06
CPCC06D5/06
Inventor WU, JIANZHOUTOMIYAMA, SHOGO
Owner DAICEL CHEM IND LTD
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