Attrition-resistant, controlled release fertilizers
US4804403A · kind A · utility
67Cited by
9References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Aug 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/664
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An attrition-resistant, controlled release fertilizer comprising a water-soluble central mass containing nucleophilic reactive functional groups surrounded and chemically bonded to a base coating formed by reacting a molecular excess of a coupling agent with the nucleophilic groups of the central particles, and a water-insoluble layer, surrounding and chemically bonded with the base coating, formed by the reaction and polymerization of the excess functional groups of the coupling agent used in forming the base coating is described. A preparation method is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.