Japan Hydrazine Co., Ltd.

Masuda Chemical Industry Co., Ltd.

Takashi Ogawa

Shunji Hyoda

Masaharu Kita

Hirotoshi Sawada

Shuichi Nemugaki

Sumio Otsuka

Yoshitaka Miyawaki

Yuhki Kubo

A process for the preparation of a 5,5'-bi-1H-tetrazole diammonium salt by using dicyan, sodium azide, ammonium chloride and water as a reaction medium. This process is industrially advantageous since the 5,5'-bi-1H-tetrazole diammonium salt is synthesized and, then, the precipitated crystals thereof are simply isolated by filtration to obtain the 5,5'-bi-1H-tetrazole diammonium salt maintaining an yield which is not lower than 90%. The 5,5'-bi-1H-tetrazole diammonium salt is a gas-generating agent for air bags, which is lowly toxic and is easy to handle.

Method for preparing 5,5'-bi-1H-tetrazole salt

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Takamatsu, Japan

Takashi Ogawa