Fertilizer compositions and method of making such compositions
US5238480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1989 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Jun 29, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC05G3/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved fertilizer composition is disclosed, including particles of a sparingly soluble fertilizer source having porous outer surfaces (for example, IBDU.RTM.) which have been coated with a hard outer coating that substantially covers the surface of each of the particles and substantially fills the pores in the surface of each of the particles. The particles are thereby hardened by the coating and are given increased resistance to abrasion and dust formation. The hardened outer coating is preferably formed when a liquid binder (which preferably includes a mixture of urea and a lignosulfonate) is sprayed onto the particles and then allowed to harden or cure. A process for making such hardened fertilizer particles is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.