Encapsulation by entrapment
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United States of America Patent
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Aug 17, 1982
Issued Date -
N/A
app pub date -
May 16, 1980
filing date -
Dec 22, 1975
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Chemical biological agents to be encapsulated are dissolved or dispersed in an aqueous solution of polyhydroxy polymer xanthate. Simultaneous addition of a strong acid and a coupling agent to the solution insolubilizes the polyhydroxy polymer without degrading the xanthate moiety, thereby entrapping the agents in a protective matrix. Encapsulation of biologically active compositions provides a shield against hostile environments, improves safety in handling, and slows the release of such compounds to the surrounding medium. Highly volatile liquids are protected against losses by evaporation. Encapsulation also provides protection against decomposition from exposure to ultraviolet light.
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