Encapsulated chemicals for use in controlled time release applications and methods
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United States of America Patent
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Apr 29, 2003
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app pub date -
Jul 12, 2002
filing date -
May 5, 2000
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Abstract
Encapsulated water soluble chemicals for use in controlled time release applications, methods of encapsulating the chemicals and methods of using the encapsulated chemicals are provided. The methods of encapsulating the chemicals are basically comprised of forming a first coating of a dry hydrophobic film forming material or a sparingly soluble material which provides a dry shield on the chemical and then forming a second coating of a porous cross-linked hydrophilic polymer on the first coating which prevents the substantial dissolution of the resulting encapsulated chemical for a selected period of time.
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