Encapsulated chemicals for use in controlled time release...

B - Operations – Transporting – 01 – J

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B01J 2/30 (2006.01) B01J 13/22 (2006.01) C04B 40/06 (2006.01) C09K 8/46 (2006.01) C09K 8/516 (2006.01) C09K 8/536 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2346341

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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