Fibrous magnesium oxide and process for production thereof
US4505887A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1984 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jun 27, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/64
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
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 EQU Mg(OH).sub.2-nx A.sub.x.sup.n-.mH.sub.2 O PA1 wherein A.sup.n- represents a monovalent (n=1) to tetravalent (n=4) anion, x is 0.2.ltoreq.x.ltoreq.0.5, and m is 0<m.ltoreq.2, or a magnesium hydroxide having a needle-like crystal structure, at a temperature of not less than about 400.degree. C. to convert it to the magnesium oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.