Process for coating an active ingredient with a urea-formaldehyde polymer

Patent metadata

Field	Value
Publication number	US-9630887-B2
Application number	US-201514793461-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Sep 12, 2008
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

The present invention relates to novel urea-formaldehyde polymers coated with an active ingredient, a method of making the same, and their use.

First claim

The invention claimed is:

1. A urea-formaldehyde polymer comprising an active agent consisting of a urease inhibitor, wherein the concentration of the active ingredient is greater than about 35 wt % based on the weight of the active ingredient containing urea-formaldehyde polymer.

2. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer and the urease inhibitor are commingled.

3. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer and the urease inhibitor are admixed.

4. The urea-formaldehyde polymer of claim 1 , wherein the urease inhibitor is NBPT.

5. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer further comprises one or more fungicides or insecticides in addition to the urease inhibitor.

6. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer has a water content of between about 1 and 80 weight percent, based on the weight of the urea-formaldehyde polymer.

7. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer has a water content of between about 10 and 35 weight percent, based on the weight of the urea-formaldehyde polymer.

8. The urea-formaldehyde polymer of claim 1 , wherein the urea-formaldehyde polymer has a water content of between about 10 and 20 weight percent, based on the weight of the urea-formaldehyde polymer.

9. The urea-formaldehyde polymer of claim 1 , further comprising residual solvent, wherein the solvent is selected from the group consisting of ethers, alcohols, hydrocarbons, halogenated hydrocarbons and aromatic hydrocarbons.

10. The urea-formaldehyde polymer of claim 9 , wherein the residual solvent is selected from ethers, alcohols, and hydrocarbons.

11. The urea-formaldehyde polymer of claim 10 , wherein the residual solvent is tetrahydrofuran.

12. The urea-formaldehyde polymer of claim 1 , comprising substantially no residual solvent.

13. The urea-formaldehyde polymer of claim 1 , wherein the polymer does not contain any residual NMP.

14. A process for preparing the urea-formaldehyde polymer of claim 1 , the method comprising mixing a urea-formaldehyde polymer with a urease inhibitor in a solvent selected from the group consisting of ethers, alcohols, hydrocarbons, halogenated hydrocarbons and aromatic hydrocarbons.

15. The process of claim 14 , wherein the solvent is tetrahydrofuran.

16. The process of claim 14 , wherein the mixing is conducted under conditions of elevated temperature and sub-atomic pressure.

17. A urea-formaldehyde polymer prepared according to the process of claim 14 so as to comprise a urease inhibitor.

Assignees

• Koch Agronomic Services Llc

Inventors

• Sutton Allen R
• Thornsberry Willis

Classifications

• C05G3/90

  for affecting the nitrification of ammonium compounds or urea in the soil · CPC title

• A01N25/10

  Macromolecular compounds · CPC title

• A01N25/12

  Powders or granules (A01N25/26 takes precedence) · CPC title

• A01N57/28

  containing acyclic or cycloaliphatic radicals · CPC title

• A01N25/26

  in coated particulate form · CPC title