Active iron powder, heat generating composition, and heat...

A - Human Necessities – 61 – F

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A61F 7/08 (2006.01) B22F 1/00 (2006.01) B22F 1/02 (2006.01) C09K 5/16 (2006.01)

Patent

CA 2573812

An active iron powder to be contained in an exothermal composition generating heat upon the contact with air, characterized in that at least a part of the surface thereof is coated with an oxidized iron film, and the above oxidized iron film has a thickness being 3 to 100 µm and 50 % or less of the whole thickness of the above active iron powder. The above iron powder is prepared by the use of an iron powder being generally produced at present and by modifying the function thereof into that of an active iron powder suitable as a raw material of an exothermal article, and is thus suitable for an exothermal composition for an exothermal article, is excellent in the initial temperature rise, and can be produced at a low cost.

Poudre de fer active à intégrer dans une composition exothermique générant de la chaleur au contact de l'air, caractérisée en ce qu'au moins une partie de la surface de celle-ci est revêtue d'un film de fer oxydé, et que le film de fer oxydé a une épaisseur comprise entre 3 et 100 µm et correspondant à 50 % ou moins de l'épaisseur totale de la poudre de fer active. La poudre de fer ci-dessus est fabriquée en utilisant une poudre de fer largement disponible dans le commerce à l'heure actuelle et en modifiant la fonction de celle-ci pour la transformer en poudre de fer active convenant comme matière première d'un article exothermique, et convenant pour une composition exothermique pour article exothermique, avec une excellente montée en température initiale et un faible coût de production.

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