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US 4,867,902 AGranted
Microencapsulated oxygen generators
AssigneeZ-Gard, Inc.
InventorDonald H. Russell
Life of this patent
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Abstract
An oxygen generating microencapsulated composition includes an oxygen generating core material and a coating which is water swellable. When exposed to water, the coating ruptures in an exfoliating manner, exposing the core material to water and thereby generating oxygen. The rate of oxygen release from the microcapsule can be controlled by altering wall continuity, thickness, capsule diameter, and coating characteristics. In other embodiments, combustion resistant materials are included in the wall material.
Claims30
A microencapsulated composition, comprising
- (i) a core material comprising an oxygen generating compound which is potassium superoxide;
- and
- (ii) a coating comprising an acceptable wall-forming water swellable polymer.
A microencapsulated composition comprising
- (i) a core material comprising an oxygen generating compound which is potassium superoxide;
- and
- (ii) a coating comprising a combustion resistant composition which is sensitive to water.
Dependencies are inferred from the claim text.