Controlled release fertilizers and methods of production

Details Controlled release fertilizers and methods of production Controlled release fertilizers and methods of production

1994-01-06

1996-07-23

Lander, Ferris

Chemistry: fertilizers

Processes and products

Organic material-containing

71 6407, 71 6411, 71 6413, C05C 900

Patent

active

055385311

ABSTRACT:
Controlled release, particulate fertilizer products having a water soluble fertilizer central mass encased in a plurality of water insoluble, abrasion resistant coatings plus unique coating compositions and methods for the production of such products are disclosed. At least one essential inner coating is a urethane reaction product of (1) a polyisocyanate selected from diphenylmethane diisocyanate, toluene diisocyanate, derivatives thereof, polymers thereof and mixtures thereof which contain about 1.5 to 3 isocyannate groups per molecule and between about 10 and 50% NCO, and (2) a polyol having about 2 to 6 hydroxyl moieties and at least one alkyl moiety containing about 10 to 22 carbon atoms, e.g. hydrogenated castor oil. An essential outer coating is formed of an organic wax having a drop melting point of between about 50.degree. and 120.degree. C.

REFERENCES:
patent: 3223518 (1965-12-01), Hansen
patent: 4042366 (1977-08-01), Fersch et al.
patent: 4772490 (1988-09-01), Kogler et al.

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