Machine system and process for producing attrition resistant slow release fertilizers
First Claim
1. Process for coating a granular material with at least one water-insoluble polymer sealing layer comprising rotating a granular material to be coated to provide a cascading flow of said granular material, injecting a plurality of coating components separately into said cascading granular material at the top moving layer of said granular material while controlling separately the flow rate of each of said plurality of coating components which are injected into said rotating granules, and recovering said coated granular material wherein said granular material contains reactive functional groups;
- one of said coating components is a coupling agent having a functional group reactive with said granular material, and one of the coating components of said water-insoluble polymer is reactive with the functional groups of said coupling agent.
2 Assignments
0 Petitions
Accused Products
Abstract
A machine system and process for producing attrition resistant, controlled release fertilizer is described. In the process, a prewet solution is used to initially coat the plant nutrient to be coated followed by the separate application of the individual components used in the coating. The machine system provides an improved means for uniformly applying a single layer or multiple layers of polymer coatings to the plant nutrient.
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Citations
12 Claims
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1. Process for coating a granular material with at least one water-insoluble polymer sealing layer comprising rotating a granular material to be coated to provide a cascading flow of said granular material, injecting a plurality of coating components separately into said cascading granular material at the top moving layer of said granular material while controlling separately the flow rate of each of said plurality of coating components which are injected into said rotating granules, and recovering said coated granular material wherein said granular material contains reactive functional groups;
- one of said coating components is a coupling agent having a functional group reactive with said granular material, and one of the coating components of said water-insoluble polymer is reactive with the functional groups of said coupling agent.
- View Dependent Claims (2, 3, 4, 5)
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6. Process for producing an attrition resistant controlled release fertilizer particulate composition comprising:
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(a) providing a water-soluble mass of plant food material; (b) prewetting said plant food material with a prewetting liquid; (c) rotating said plant food material of step (b) to provide a cascading flow of said plant food material; (d) contacting said cascading plant food material of step (c) above with a first reactive coating component by injecting said first reactive coating component into the top layer of said cascading flow of material; and (e) contacting said intermediate material of step (d) with a second reactive coating component by injecting said second coating component into the top layer of said cascading flow of material, said second reactive coating component containing functional groups reactive with said first reactive coating component to provide a water-insoluble layer. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification