Process for encapsulating particles with a silicone

Details Process for encapsulating particles with a silicone Process for encapsulating particles with a silicone

1989-12-21

1992-07-14

Lovering, Richard D.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

47 576, 424462, 424497, 424501, 427212, 427213, B01J 1304, B05D 724

Patent

active

051301717

ABSTRACT:
Particles of active substance are encapsulated by spraying them with a thermoplastic silicone copolymer in solution in an organic solvent or in an aqueous dispersion or emulsion and removing the solvent or water by drying with hot air. The spraying/drying process employed is, for example, the Wurster process. The copolymer employed can be made up of a succession of polydiorganosiloxane segments or blocks and of organic segments or blocks (polyesters, polyethers, polyurethanes, polystyrenes, and the like). It can also be a polydiorganosiloxane grafted with organic chains. The active substance is in the form of particles with a particle size of between 50 .mu.m and 5 mm. It may be a catalyst, a perfume, a colorant, a cosmetic product, a medication, a plant-protection product, plant seeds, and the like.
The invention is especially useful for controlling the release of active substance in an aqueous medium.

REFERENCES:
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patent: 3247066 (1966-04-01), Milosovich, Jr.
patent: 3832252 (1974-08-01), Higuchi et al.
patent: 3911183 (1975-10-01), Hinkes
patent: 3921636 (1975-11-01), Zaffaroni
patent: 3943063 (1976-03-01), Morishita et al.
patent: 4230686 (1980-10-01), Schofflin et al.
patent: 4851216 (1989-07-01), Lee

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