US2009035384A1PendingUtilityA1

Process for producing coated urea-formaldehyde polymers

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Individually held — no corporate assignee on recordPriority: Mar 31, 2006Filed: Mar 1, 2007Published: Feb 5, 2009
Est. expiryMar 31, 2026(expired)· nominal 20-yr term from priority
Inventors:Gregory H. LambethGerry M. Sulzer
C05G 3/90C08G 12/40C08J 7/065C08G 12/12C08J 2361/24C05C 9/02Y10T428/31942A01N 25/26
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Claims

Abstract

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

Claims

exact text as granted — not AI-modified
1 . A process comprising depositing one or more active ingredients onto urea-formaldehyde polymers, wherein said one or more active ingredients are selected from compounds, chemicals, etc., that find use in agricultural applications and said active ingredients are deposited onto said urea-formaldehyde polymers by contacting, in a drying device, a urea-formaldehyde polymer with a solution comprising a solvent selected from ethers, alcohols, hydrocarbons, halogenated hydrocarbons and aromatic hydrocarbons and said one or more active ingredients under conditions including elevated temperatures and sub-atmospheric pressures. 
   
   
       2 . A process comprising contacting a urea-formaldehyde polymer with a solution comprising tetrahydrofuran and an active ingredient under conditions including elevated temperatures and sub-atmospheric pressures. 
   
   
       3 . The process according to any of  claim 1  or  2  wherein said active ingredient is selected from urease inhibitors, fungicides and insecticides. 
   
   
       4 . The process according to any of  claim 1  or  2  wherein said active ingredient is a urease inhibitor. 
   
   
       5 . The process according to  claim 4  wherein said urease inhibitor is NBPT. 
   
   
       6 . The process according to any of  claim 1  or  2  wherein said urea-formaldehyde polymer is selected from those having a water content of between from about 1 and 80 wt. %, based on the weight of the urea-formaldehyde polymer. 
   
   
       7 . The process according to  claim 5  wherein said urea-formaldehyde polymer is selected from those having a water content of between from about 10 and 35 wt. %, based on the weight of the urea-formaldehyde polymer. 
   
   
       8 . The process according to any of  claim 1  or  2  wherein said urea-formaldehyde polymer is selected from i) PERGOPAK® ii) PERGOPAK® M urea-formaldehyde polymers. 
   
   
       9 . The process according to  claim 7  wherein said urea-formaldehyde polymer is selected from those sold under the name PERGOPAK® M by the Albemarle Corporation. 
   
   
       10 . The process according to  claim 3  wherein said drying device is selected from high shear mixer, ribbon drier, blade drier, and other similar devices. 
   
   
       11 . The process according to  claim 4  wherein said drying device is selected from ribbon driers and blade driers. 
   
   
       12 . The process according to any of  claim 1  or  2  wherein said urea-formaldehyde polymer and solution are introduced into the drying device i) simultaneously, ii) in stages, iii) either the polymer or solution introduced before the other, iv) or any combinations thereof. 
   
   
       13 . The process according to  claim 12  wherein said process is either batch or continuous. 
   
   
       14 . The process according to  claim 10  wherein the solution is introduced into the drying device after the urea-formaldehyde polymer. 
   
   
       15 . The process according to  claim 12  wherein the introduction of the solution is at a rate substantially equal to the rate at which the solvent volatilizes. 
   
   
       16 . The process according to any of  claim 1  or  2  wherein said elevated temperatures are in the range of from about 20° C. to about 200° C. and said sub-atmospheric temperatures are in the range of from about 760 mmHg to about 0.1 mmHg. 
   
   
       17 . The process according to  claim 8  wherein said elevated temperatures are in the range of from about 20° C. to about 100° C. and said sub-atmospheric temperatures are in the range of from about 500 mmHg to about 50 mmHg. 
   
   
       18 . The process according to  claim 12  wherein said elevated temperatures in the range of from about 20° C. to about 50° C. and said sub-atmospheric temperatures are in the range of from about 100 mmHg to about 50 mmHg. 
   
   
       19 . The coated urea-formaldehyde polymer of  claim 9 . 
   
   
       20 . An active-ingredient-coated urea-formaldehyde polymer having an active ingredient concentration greater than about 35 wt. %, based on the weight of the active-ingredient-coated urea-formaldehyde polymer, wherein said active ingredient is selected from urease inhibitors, fungicides and insecticides. 
   
   
       21 . An active-ingredient-coated urea-formaldehyde polymer having an active ingredient concentration greater than about 35 wt. %, based on the weight of the active-ingredient-coated urea-formaldehyde polymer, wherein said active ingredient is one or more of urease inhibitors, fungicides, and insecticides, said active-ingredient-coated urea-formaldehyde polymer made by
 a) a process comprising depositing said active ingredient onto urea-formaldehyde polymers, wherein said active ingredient is deposited onto said urea-formaldehyde polymers by contacting, in a drying device, a urea-formaldehyde polymer with a solution comprising a solvent selected from ethers, alcohols, hydrocarbons, halogenated hydrocarbons and aromatic hydrocarbons and said active ingredient under conditions including elevated temperatures and sub-atmospheric pressures thereby forming said active-ingredient-coated urea-formaldehyde polymer; or   b) a process comprising contacting a urea-formaldehyde polymer with a solution comprising tetrahydrofuran and said active ingredient active ingredient under conditions including elevated temperatures and sub-atmospheric pressures thereby forming said active-ingredient-coated urea-formaldehyde polymer.   
   
   
       22 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 21  wherein said active ingredient is selected from urease inhibitors, fungicides and insecticides. 
   
   
       23 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 21  wherein said active ingredient is a urease inhibitor. 
   
   
       24 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 21  wherein said urease inhibitor is NBPT. 
   
   
       25 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 22  wherein the active ingredient concentration is in the range of from about 40 wt. % to about 80 wt. %, based on the weight of the active-ingredient-coated urea-formaldehyde polymer. 
   
   
       26 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 21  wherein the storage life of the active-ingredient-coated urea-formaldehyde polymers is at least twice that of active-ingredient-coated urea-formaldehyde polymers that were coated using NMP as a solvent. 
   
   
       27 . The active-ingredient-coated urea-formaldehyde polymer according to  claim 25  wherein the storage life of the active-ingredient-coated urea-formaldehyde polymers is at least twice that of active-ingredient-coated urea-formaldehyde polymers that were coated using NMP as a solvent. 
   
   
       28 . The use of the active-ingredient-coated urea-formaldehyde polymer according to  claim 21  in agricultural applications wherein the function of a urease inhibitor is desired. 
   
   
       29 . The use of the active-ingredient-coated urea-formaldehyde polymer according to  claim 27  in agricultural applications wherein the function of a urease inhibitor is desired.

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