Process for making a slow release fertilizer comprising urea, paraffin wax, and a polymeric urea-paraffin wax adduct inhibitor

Claim 1

METHOD OF FORMING A SLOW RELEASE FERTILIZER COMPRISING A DISPERSION OF SOLID UREA IN A SOLID PARAFFIN WAX WHICH WHEN IN MOLTEN STATE NORMALLY REACTS WITH SOLID UREA TO FORM AN ADDUT WHICH COMPRISES (1) HEATING SAID PARAFFIN WAX TO ABOVE ITS MELTING POINT WHEREBY MOLTEN PARAFFIN WAX NORMALLY SUSCEPTIBLE TO ADDITION IS OBTAINED, (2) ADDING TO AND DISSOLVING IN THE RESULTING MOLTEN PARAFFIN WAX A WAX SOLUBLE ADDUCT INHIBITOR SELECTED FROM THE GROUP CONSISTING OF VINYL POLYMERS, CONDENSATION POLYMERS, POLYMERS OF OLEFIN OXIDES CONTAINING 2-3 CARBON ATOMS, AND MIXTURES THEREOF, SAID POLYMER HAVING A MOLECULAR WEIGHT OF AT LEAST 400, HAVING AT LEAST 5 REPEATING UNITS, AND BEING USED IN THE AMOUNT OF 1-25% BY WEIGHT OF SAID MOLTEN PARAFFIN WAX, (3) DISPERSING SOLID UREA IN THE MOLTEN PARAFFIN WAX CONTAINING SAID ADDUCT INHIBITORM AND (4) COOLING THE RESULTING DISPERSION TO BELOW THE MELTING POINT OF THE WAX WHEREBY A SLOW RELEASE FERTILIZER COMPRISING A DISPERSION OF SOLID UREA IN SOLID PARAFFIN WAX IS OBTAINED.