Controlled release capsules

Details Controlled release capsules Controlled release capsules

1975-07-30

1977-01-11

Hart, Charles N.

Chemistry: fertilizers

Processes and products

Organic material-containing

71 64F, 71 65, 71 67, C05G 100, C05G 302

Patent

active

040024580

ABSTRACT:
The disclosed substantially spherical capsules are particularly adapted for containing a liquid and have permeable or semi-permeable capsule walls. The capsule walls can comprise a first crystalline phase, an amorphous phase which ordinarily is intimately associated with the crystalline phase, and, preferably, a dispersed (discontinuous) second crystalline or semi-crystalline phase such as a wax. These capsules have the ability to release a solute by an effect resembling osmosis and to release a liquid by a transmission and evaporation mechanism.

REFERENCES:
patent: 2770571 (1956-11-01), Vance et al.
patent: 3079351 (1963-02-01), Staneslow et al.
patent: 3132074 (1964-05-01), Svedres
patent: 3423489 (1969-01-01), Arens et al.
patent: 3778383 (1973-12-01), Schibler et al.
patent: 3790497 (1974-02-01), Sato et al.
patent: 3943063 (1976-03-01), Morishita et al.

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