Controlled release fertilizer compositions and processes for the preparation thereof

• Main Authors: VAN KAATHOVEN, HENDRIKUS GIJSBERTUS ADRIANUS, AALTO, SEIJA HELENA, TIJSMA, EDZE JAN, TERLINGEN, JOHANNES GIJSBERTUS ANTONIUS
• Format: Patent
• Language: English
• Published: 28.08.2002
• Edition: 7
• Subjects: AGRICULTURE; ANIMAL HUSBANDRY; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; FERTILISERS; FERTILISERS CHARACTERISED BY THEIR FORM; FISHING; FORESTRY; HUMAN NECESSITIES; HUNTING; MANUFACTURE THEREOF; METALLURGY; MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS; PERFORMING OPERATIONS; PEST REPELLANTS OR ATTRACTANTS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PLANT GROWTH REGULATORS; PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF; THEIR RELEVANT APPARATUS; TRANSPORTING; TRAPPING

A controlled release fertilizer composition comprising a granulated core material of at least one water soluble fertilizer compound and a substantially water insoluble coating. The granules comprising the core material have substantially smooth outer surfaces with at least 95% of the granules being substantially spherical. The coating comprises a single layer of a continuous polymer film that is present on at least 90% of the granules. The fertilizer composition provides a cumulative release of the fertilizer compound of less than 10% by weight within the first 30 days following exposure to water. Processes for the preparation of the controlled release fertilizer composition are also disclosed.