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US 3,954,678 AGranted
Semipermeable microcapsules containing a silica gel
AssigneeE. I. Du Pont de Nemours and Company
InventorMark James Marquisee
Life of this patent
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Abstract
Described are semipermeable microcapsules which comprise an outer semipermeable polymeric skin encapsulating a silica gel. These microcapsules may be used as chromatographic media or may be modified to contain a homogeneous or heterogeneous catalyst and/or a ferromagnetic material.
Claims11
A semipermeable microcapsule which comprises an outer semipermeable polymeric skin selected from the group consisting of polystyrene, collodion, ethylcellulose, cellulose acetate butyrate, polyamide, polyurethane, polysulfonamide, polyurea, polyester and polycarbonate encapsulating therein a silica gel.
Dependencies are inferred from the claim text.