Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...
Patent
1988-04-29
1990-12-18
Lovering, Richard D.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
Liquid encapsulation utilizing an emulsion or dispersion to...
264 41, 264 43, 264 23, 4272133, 42721331, 42721333, 42721335, 425 5, 425804, B01J 1302, B01J 1320, B01J 1322
Patent
active
049784838
ABSTRACT:
The invention is a process and apparatus for the manufacture of microcapsules. The microcapsules have a core which contains a liquid, gaseous, solid or multiple-phase material which is coated with an impermeable film. The microcapsules are formed by applying high pressure, for a short period of time, to a mixture of the core and shell material, and by gradually reducing the pressure, such as by passing the capsules through a baffled chamber. The invention also includes a method for adjusting the size of the microcapsules, and for adjusting the thickness of their shells. The microcapsules can be made with several shell layers, to increase their strength. They can also be made as multiple capsules, having two or more cores. The invention also includes a method and apparatus for making microcapsules in a continuous process. The present invention produces microcapsules in a small fraction of the time required by methods of the prior art.
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Covert John M.
Lipton Robert S.
Lovering Richard D.
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