Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...
Patent
1987-05-14
1988-12-06
Lovering, Richard D.
Plastic and nonmetallic article shaping or treating: processes
Encapsulating normally liquid material
Liquid encapsulation utilizing an emulsion or dispersion to...
71 6411, 71DIG1, 264 43, 424424, 424425, 424493, 424497, 426 89, 426103, 514963, 6048921, A61K 962, A61K 964, B01J 1302
Patent
active
047895160
ABSTRACT:
Permeable capsules are loaded with a reservoir of the substance to be dispensed at a concentration sufficient to provide an osmotic pressure above threshold level, and the pore size of the capsule membrane is controlled so that the passage of the substance through the membrane becomes the rate-limiting factor in dispensing. Shape-retaining spheres are formed from a water-soluble polymer containing plural anionic or cationic groups and cross-linking surface layers of the spheres by contact with a polymer having plural groups of charge opposite that of the water-soluble polymer. After loading, the capsules are again treated with the same or a different cross-linking polymer to reduce the dimensions of the pores.
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Lovering Richard D.
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