PROCESS FOR PRODUCING IMPROVED SULFUR-COATED UREA SLOW RELEASE FERTILIZERS

摘要

The present invention describes a sulfur-coated ureaslow release granular fertilizer having a uniform, durablepolymeric coating over the sulfur-coating. The polymercoating is formed by the direct in situ co-polymerization ofdiethylene glycol-triethanolamine polyol and a diisocyanate onthe surface of the sulfur-coated urea granule. The polymericcoating provides improved impact resistance of the compositecoated granule.