Nippon Carbide Kogyo Kabushiki Kaisha

Yasushi Imai

Masanori Sasaki

Hiroshi Shibafuchi

Takehiko Yoshie

Masahiko Yoshida

Masahiro Murotani

Kenichi Ishii

Hajime Mura

Kazuyoshi Miyata

Yukihiro Takeda

A method for producing 3-amino-5-mercapto-1,2,4-triazole, useful as an intermediate compound for a medicine or pesticide, or the intermediate thereof, a salt of N-guanidino thiourea from aminoguanidine thiocyanate or a thiocyanate and an aminoguanidine compound in the presence of an acid in a polar solvent, or even from hydrazine and cyanamide is disclosed.

Processes for producing a salt of N-guanidino thiourea and

Alkali metal azide particles most of which have a nearly spherical shape and take a spongy structure and whose volume average particle size ratio in the ultrasonic dispersion treatment is desirously 0.4 or less. Since self-decomposition characteristics of the alkali metal azide particles according to this invention are quite mild, they can be simply handled in large amounts and are quite useful as a gas generating agent for an automobile air bag.

Alkali metal azide particles

The method of producing an alkali metal azide involves reaction of hydrazine with an alkyl nitrite in a solvent in the presence of an alkali metal hydroxide. As the solvent is used as aqueous solvent and the reaction ratio of hydrazine is controlled within the range between 50% and 90%. The method can produce with high purities and in high yields alkali metal azides useful as a raw material for the preparation of tetrazoles which can be used as an intermediate material for medicines, as a raw material for the preparation of organic azides useful for light sensitive materials for photo masks employed in the field of electronics industries, or as a major raw material for inflaters used in air bags for cars.

Method of producing alkali metal azides

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Hiratsuka, Japan

Yasushi Imai