Processes for the preparation of sulfur coated fertilizers and p

Details Processes for the preparation of sulfur coated fertilizers and p Processes for the preparation of sulfur coated fertilizers and p

1993-06-14

1995-04-11

Lander, Ferris

Chemistry: fertilizers

Processes and products

Organic material-containing

71 6407, 71 6411, 71 6413, 71904, C05C 900, C05G 310, C05G 500

Patent

active

054054265

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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patent: 3991225 (1976-11-01), Bouin
patent: 4042366 (1977-08-01), Fersch et al.
B. R. Currell and A. J. Williams, "Thermal Analysis of Elemental Sulpher", Thermochimica Acta, 9 (1974) pp. 255-259.
Ki-Tat Ho, Gary Derdall and J. B. Hyne, "Dependence of Friability on Ageing of Freshly Formed Sulphur and the Effect of Quench Medium Temperature"; Alberta Sulpur Research Ltd. Quarterly Bulletin, vol.XVII, Nos. 3-4, Oct. 1980-Mar. 1981, pp. 15-24.
Ralf Steudel, Sabine Passlack-Stephan and Gabriele Holdt, "Thermal Polymerization and Depolymerization Reactions of 10 Sulfur Allotropes Studied by HPLC and DSC"; Z. anorg. allg. Chem. 515 (1984), pp. 7-42 (no month).
Malcolm Thackray, "Melting Point Intervals of Sulfur Allotropes"; Journal of Chemical and Engineering Data, vol. 15, No. 4, 1970, pp. 495-497 (no month).
B. Meyer, "Preparation and Properties of Sulfur Allotropes"; Elemental Sulfur-Chemistry & Physics, Chap.4, 1965, pp. 71-84 (no month).
Beat Meyer, "The Structures of Elemental Sulfur"; Adv. Inds. Chem. Radiochem., Chap. 18, 1976, pp. 287-317 (no month).

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