EXOTHERMAL COMPOSITION, EXOTHERMAL ARTICLE AND METHOD FOR PRODUCING EXOTHERMAL ARTICLE

摘要

There are provided a heat generating composition and a heat generating body having excellent exothermic rising properties and having exothermic holding properties over a long period of time and a process for producing the same.;The invention is concerned with a heat generating composition, characterized in that the heat generating composition contains, as essential components, an iron powder, a carbon component, a reaction accelerator, a hydrogen formation inhibitor and water; that the iron powder contains from 20 to 100 % by weight of an active iron powder; and that the active iron powder is at least any one of an active iron powder in which at least a part of the surface of an iron powder is covered by an iron oxide film and a thickness of the iron oxide film is 3 nm or more, and which has a region of an oxygen-free iron component in at least one region selected from a central region of the active iron powder and a region beneath the iron oxide film, and an active iron powder in which an amount of wustite is from 2 to 50 % by weight in terms of an X-ray peak intensity ratio to iron.