Vacuum coated particulate fertilizers
US6080221A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1999 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Sep 17, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G5/38
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of coating fertilizer particles exhibiting porous surfaces under vacuum to form attrition resistant controlled release particulate fertilizers, by drawing a vacuum on the fertilizer particles and applying thereto a water insoluble fluid resin at about atmospheric pressure, so that the fluid resin is forced into the porous surfaces of the fertilizer particles by differences in pressure, and then hardening the fluid resin to form a solid resin, tenaciously bonded onto, and into, the porous surfaces of the fertilizer particles. Porous surfaced water soluble, slow releasing and sulfur coated, fertilizers may be effectively coated. Granular, briquetted, compacted and other special shaped fertilizers may also be effectively vacuum coated to provide controlled release products. Pesticides may also be effectively included in these attrition resistant products. Fertilizers are provided which exhibit substantially improved resistance to attrition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.