Uniform oxide microspheres and a process for their manufacture
US4010242A · kind A · utility
65Cited by
11References
6Claims
0Family size
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Key dates
| Filing date | Nov 20, 1973 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Nov 20, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Oxide microspheres having a diameter in the 0.5 to 20 micron range are produced by forming a mixture of urea or melamine and formaldehyde in an aqueous sol containing colloidal oxide particles. Copolymerization of the organic constituents produces coacervation of the organic material into microparticles containing the inorganic material. The organic constituent can be burned out to form a powder of uniform-sized porous microparticles consisting of an interconnected array of inorganic colloidal particles separated by uniform-sized pores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.