Process for producing improved sulfur-coated urea slow release fertilizers
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United States of America Patent
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Feb 4, 1997
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app pub date -
Sep 23, 1994
filing date -
Sep 23, 1994
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Abstract
The present invention describes a sulfur-coated urea slow release granular fertilizer having a uniform, durable polymeric coating over the sulfur-coating. The polymer coating is formed by the direct in situ co-polymerization of diethylene glycol-triethanolamine polyol and a diisocyanate on the surface of the sulfur-coated urea granule. The polymeric coating provides improved impact resistance of the composite coated granule.
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