发明名称 |
Magnetically attractable particles and method of preparation. |
摘要 |
<p>Magnetically attractable particles comprise a core of magnetic material encapsulated in a metal oxide coating. They may be made by emulsifying an aqueous solution or dispersion of the magnetic material or precursor, and an aqueous solution or sol of a coating inorganic oxide or precursor, in an inert water-immiscible liquid. The aqueous droplets are gelled, e.g. by ammonia or an amine, recovered, and heated at 250 - 2000<o>C. The resulting particles are generally smooth spheres below 100 microns in diameter and often of sub-micron size.</p> |
申请公布号 |
EP0343934(A2) |
申请公布日期 |
1989.11.29 |
申请号 |
EP19890305215 |
申请日期 |
1989.05.23 |
申请人 |
ALCAN INTERNATIONAL LIMITED |
发明人 |
GROVES, PAUL;FLYNN, GERARD;SANG, JEAN VICTOR;BURRELL,ROBERT EDWARD |
分类号 |
C12N11/14;B03C1/01;C01G49/00;C01G49/08;G01N33/543;H01F1/36;H01F1/37;H01F1/44 |
主分类号 |
C12N11/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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