Processes for the preparation of sulfur coated fertilizers and products produced thereby
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United States of America Patent
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Apr 11, 1995
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Jun 14, 1993
filing date -
Mar 8, 1991
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Abstract
Extended residual, controlled release sulfur coated fertilizers having polymeric topcoats applied over a sulfur coating layer are prepared wherein the sulfur coating contains a sufficient amount of a crystalline sulfur allotrope in combination with at least a minimal level of carbon disulfide insoluble amorphous sulfur to maintain the sulfur coating in a pliable, resilient condition at the time at which the polymeric topcoat is applied over the sulfur coating. The presence of such sulfur allotrope is demonstrated by a shoulder endotherm appearing on a differential scanning calorimetry thermogram within a transition temperature range of about 84.degree. C.-97.degree. C.
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