Multicomponent powder mixing process and compositions produced thereby
US5628945A · kind A · utility
Inventors
Key dates
| Filing date | Aug 3, 1992 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Aug 3, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2214/05
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for controlling chemical distribution of substances in a solid state (and products produced thereby), the method comprising the steps of mixing particles of a first powder and a triggerable granule facilitator to form first microcapsules, the first microcapsules each having a core of one of the particles and a cladding of the facilitator; and triggering the facilitator while dry mixing the microcapsules to form substantially spherical granules of the microcapsules, the granules each having a controlled chemical distribution. The method also includes the steps of mixing particles of a second powder with the facilitator to form second microcapsules, the second microcapsules each having a core of one of the particles of the second powder and a cladding of the facilitator; and then mixing the first and the second microcapsules prior to said triggering step. The method further includes the step of the triggering, mixing the first microcapsules and a second triggerable granule facilitator to form a second cladding on the first microcapsules. To any of the foregoing, there can be the further step of pyrolyzing the microcapsules to remove a portion of the facilitator but leave a r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.