Controlled-release type fertilizer with decreased floating property comprising tri-block copolymer and method for preparing the same
AssigneesLG Chem, Ltd., Farmhannong Co., Ltd.
InventorsMihee KIM, Hyosook JOO, Eun Kyoung PARK, Hyeon CHOI, Kiyoul YOON, Joon Seok LEE
Life of this patent
Estimating the term…
Abstract
The present invention relates to a controlled-release type fertilizer with outstandingly decreased floating property, comprising a granular fertilize core; a coating layer (shell) formed on the surface of the granular fertilizer core, and comprising olefin-based resin; and additives attached on the coating layer, and comprising ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) or propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.
Claims20
A controlled-release type fertilizer comprising:
- a granular fertilizer core;
- a coating layer formed on the surface of the granular fertilizer core, the coating layer comprising an olefin-based resin;
- and
- additives attached on the coating layer, the additives comprising an ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) tri-block copolymer or a propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.
A method for preparing a controlled-release type fertilizer, comprising the steps of:
- i) coating the surface of a granular fertilizer core with a coating composition comprising an olefin-based resin to form a first coating layer;
- and
- ii) coating the first coating layer with liquid additives comprising an ethylene oxide-propylene oxide-ethylene oxide(EO-PO-EO) tri-block copolymer or a propylene oxide-ethylene oxide-propylene oxide(PO-EO-PO) tri-block copolymer.
Dependencies are inferred from the claim text.