Fibrous magnesium oxide and process for production thereof

Abstract From the Canadian patent

A magnesium oxide having a cubic system needle-like crystal structure and a length-to-diameter ratio, determined by an electron microscope at a magnification of 10,000, of at least about 5; and a process for producing a magnesium oxide having a cubic system needle-like crystal structure, which comprises calcining a basic magnesium compound having a needle-like crystal structure expressed by the following formula wherein An- represents a monovalent (n=1) to tetravalent (n=4) anion, x is 0.2?x?0.5 and, m is O<m?2, or a magnesium hydroxide having a needle-like crystal structure, at a temperature of not less than about 400°C to convert it to the magnesium oxide.