Sulfur containing isocyanate compositions

Details Sulfur containing isocyanate compositions Sulfur containing isocyanate compositions

1999-02-22

2000-11-28

Griffin, Steven P.

Chemistry: fertilizers

Processes and products

71 31, 71 6407, 71 64011, 71 6413, A01N 2500, A01N 2700, A01N 3100

Patent

active

061529818

ABSTRACT:
This invention relates to an isocyanate composition comprising a) at least one isocyanate and b) from 1 to 50% by weight, based on the total weight of component a), of sulfur. These isocyanate compositions are suitable for the preparation of polyurethane/polyurea encapsulated fertilizers. Accordingly, the present invention also relates to an improved process for the production of a polyurea/polyurethane encapsulated fertilizer comprising applying at least one isocyanate-reactive component to the fertilizer particles and applying the isocyanate compositions of the present invention to the fertilizer particles, to form these polyurea/polyurethane encapsulated fertilizers.

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Sulfur Solubility in Pure & Mixed Organic Solvents, Ind. Eng. Chem. (month unavailable) pp. 485-491.
"Solubility of Elemental Sulfur in a Number of Organic Solvents", by G.S. Frolov, V.I. Lazerev, I.S. Antsypovich and T.V. Epishkina translated from Zhurnal Prikladnoi Khimii, vol. 48, No. 8, pp. 1853-1855, Aug. 1975, Original article submitted Oct. 14, 1974.

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