Coated controlled-release product
AssigneeD. M. Scott & Sons Company
InventorsLawrence S. Wittenbrook, Edwin L. Scheiderer
Life of this patent
Estimating the term…
Abstract
A coated product providing for the controlled release of an active constituent, such as a fertilizer, over a long period of time comprising a core of an active constituent and two water insoluble coatings. The first coating surrounding the core contains masonry cement, and the second coating preferably contains a blend of one or more thermoplastic polymers and a wax. The coated product provides an unusually long lasting fertilizer at relatively low cost.
Claims21
A coated product providing for the release of a water soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement.
A controlled-release fertilizer product comprising a core containing a water-soluble fertilizer in particulate form, a first coating surrounding said core containing masonry cement, a second coating surrounding said first coating comprising a blend of a copolymer of an olefin and an unsaturated ester, a thermoplastic hydrocarbon resin and a wax.
A process for the preparation of a controlled-release product comprising coating a core comprising a water soluble fertilizer in particulate form with a finely divided mixture containing cement and applying to said coated core a second coating of a water insoluble material.
A coated product providing for the release of a water-soluble fertilizer over a long period of time comprising a core containing a water soluble fertilizer in particulate form and two water insoluble coatings surrounding said core, the inner of said two coatings comprising cement and bentonite, the second coating comprising a blend of a thermoplastic interpolymer, a thermoplastic hydrocarbon resin and a wax.
Dependencies are inferred from the claim text.