Controlled release fertilizer with biopolymer coating and process for making same

Inactive Publication Date: 2012-04-19
NEW FERTILIZER TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The fertilizers of the present invention are in a granular form and provide controlled release of the fertilizer to plants. The granular fertilizers have a coating of a biologically degradable polymer (biopolymer). When such fertilizer is applied to the soil, microorganisms metabolize or by some mechanism, disrupt the biopolymer coating over time, releasing the fertilizer at a rate controlled by the amount, i.e., thickness of the biopolymer coating and chemical characteristics of the biopolymer, as well as environmental conditions such as soil and / or air temperature and available water. The fertilizers may include additional advantageous agents such as micro and macro nutrients and other agriculturally beneficial materials.

Problems solved by technology

There are many slow and extended release fertilizers with their nutrient release based on time and event related coating failures or coating permeability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032]A bench scale test was conducted to produce test product sample 9. The following materials were used:

[0033]665 grams of granular urea (280 SGN)

[0034]31.5 grams of Olygos® Bioresin 120

[0035]3.5 grams of corn syrup (64.0% solids)

[0036]56.1 grams talc

From the afore stated OLYGOS™ Bioresin 120 Technical Data Sheets:

Typical (Average) Composition*

[0037]

Bioresin 120MethodLactyl-based species 85%TitrationOrganic Acids 10%GC-MSPolyols4.7%GC-MSInorganic Species≦0.3%   ICP-AES

[0038]The biopolymer, Olygos® and flow sealer modifier, corn syrup were combined in a beaker and heated to 360° F. on a hot plate. Urea was placed in a bench scale rotary drum coater (12″ diameter) equipped with anti slip rods and preheated to 208° F. to produce fertilizer granules composed of urea. After the Olygos and corn syrup mixture reached 360° F. it was poured over the rolling bed of urea granules and allowed to mix. After the coating application was completed, the parting agent, talc was applied to the roll...

example 2

[0039]A bench scale test was conducted to produce test product sample 22. The following materials were used:

[0040]672 grams of granular urea (280 SGN)

[0041]25.2 grams of Olygos Bioresin 120

[0042]2.8 grams of corn syrup (64.0% solids)

[0043]9.2 grams of Evacote®

[0044]Olygos and corn syrup were combined in a beaker and heated to 355° F. on a hot plate. Urea was placed in a bench scale rotary drum coater (12″ diameter) equipped with anti slip rods and preheated to 200° F. After the Olygos and corn syrup mixture reached 355° F. it was poured over the rolling bed of urea granules and allowed to mix. After the coating application was completed, nitrogen was sparged into the rolling bed to quickly cool the coating. The bed was cooled to 70° F.

[0045]Evacote® was heated to 185° F. in a beaker on a hot plate prior to pouring on to the rolling bed. Evacote is described above and is a water resistant sealant applied as a second, exterior coating, after the biopolymer coating application. The bed...

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Abstract

A controlled release fertilizer including a fertilizer granule, having an outer surface, a coating of biopolymer composition on the outer surface of the fertilizer granule, wherein the biopolymer composition includes at least one biopolymer, and a process of making the controlled release fertilizer including the steps of screening fertilizer granules to a preselected granule size, heating a biopolymer to become substantially fluid, and applying the biopolymer onto the surface of the fertilizer granule to produce a coating on the granule of a predetermined amount.

Description

BACKGROUND OF THE INVENTION[0001]The present invention is directed towards new and entirely unexpected granular fertilizers and processes for making the fertilizers, which provide controlled release of the fertilizer to plants. The fertilizers may include additional advantageous agents such as micro and macro nutrients and other agriculturally beneficial materials. More particularly, the present invention is a granular fertilizer coated with a biologically degradable polymer (biopolymer). When such fertilizer is applied to the soil, microorganisms will degrade the biopolymer coating over time, releasing the fertilizer at a rate controlled by the amount, i.e., thickness of the biopolymer coating and chemical characteristics of the biopolymer, as well as environmental conditions.[0002]There are many slow and extended release fertilizers with their nutrient release based on time and event related coating failures or coating permeability. These fertilizers are influenced by factors such...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C05C9/00B05D1/02C05D9/02
CPCC05G3/0029C05G3/0035C05G5/37C05G5/38
Inventor PURSELL, TAYLORSHIRLEY, JR., ARTHUR R.COCHRAN, KEITH D.MILLER, JOSEPH M.HOLT, TIMOTHY G.PEEDEN, GREGORY S.
Owner NEW FERTILIZER TECH LLC
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