Method of producing single crystalline, acicular .alpha.-ferric oxide
US4414196A · kind A · utility
26Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1981 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Nov 18, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/62
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of producing single crystalline, acicular .alpha.-ferric oxide particles of narrow particle size distribution is provided. The method comprises heating an aqueous suspension of ferric hydroxide at temperatures of 100.degree.-250.degree. C. at an alkaline pH in the presence both a water soluble organic or inorganic compound capable of forming complexes with iron as a growth regulating agent and .alpha.-ferric oxide seed crystals of minor axes not larger than 0.4 microns in average in amounts of 0.1-25 mole % in terms of the Fe content thereof in relation to the ferric hydroxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.