US2012046173A1PendingUtilityA1

Process for preparing paste-extruded sulfonamide compositions

42
Individually held — no corporate assignee on recordPriority: Sep 12, 2002Filed: Oct 31, 2011Published: Feb 23, 2012
Est. expirySep 12, 2022(expired)· nominal 20-yr term from priority
Inventors:Joseph J. KeenanLuann Marshall PughRobert Thomas Roche
A01N 43/90A01N 47/36A01N 25/12A01N 25/14A01N 43/64
42
PatentIndex Score
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Claims

Abstract

Paste-extruded sulfonamide herbicide compositions having improved spray equipment clean-out properties are made by preparing a mixture comprising a sulfonamide herbicide free acid, at least about 50 equivalent % of an inorganic base relative to the sulfonamide herbicide free acid and sufficient water to form an extrudable paste, extruding the mixture to form an extrudate, and drying the extrudate.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A process for preparing a paste-extruded sulfonamide herbicide composition comprising
 (a) preparing a mixture comprising
 (i) from 2 to 90% by weight on a water-free basis of one or more active ingredients comprising a sulfonamide herbicide free acid component consisting of one or more sulfonamide herbicide free acids, wherein the sulfonamide herbicide free acid component comprises nicosulfuron; 
 (ii) from 0 to 95% by weight on a water-free basis of one or more additives selected from the group consisting of wetting agents, dispersants, lubricants, anticaking agents, chemical stabilizers and diluents; 
 (iii) at least about 50 equivalent % of base selected from inorganic base equivalents having conjugate acid pK a s at least 2.1 units greater than the highest pK a  of the sulfonamide herbicide free acid component;
 the sum of the weight percents of all the ingredients in the mixture totaling 100% on a water-free basis; and 
 
 (iv) sufficient water to make the mixture an extrudable paste; 
   (b) extruding the mixture prepared in (a) through a die or screen to form extrudate; and   (c) drying the extrudate.   
     
     
         2 . The process of  claim 1  wherein the mixture comprises at least about 75 equivalent % of base. 
     
     
         3 . The process of  claim 2  wherein the mixture comprises at least about 100 equivalent % of base. 
     
     
         4 . The process of  claim 1  wherein the base comprises an inorganic base selected from the group consisting of sodium hydrogen carbonate, sodium carbonate, sodium hydrogen phosphate, sodium phosphate, potassium hydrogen carbonate, potassium carbonate, potassium hydrogen phosphate and potassium phosphate. 
     
     
         5 . The process of  claim 4  wherein the base comprises an inorganic base selected from the group consisting of sodium carbonate, sodium phosphate, potassium carbonate and potassium phosphate. 
     
     
         6 . The process of  claim 5  wherein the base comprises sodium carbonate. 
     
     
         7 . The process of  claim 5  wherein the base comprises sodium phosphate. 
     
     
         8 . The process of  claim 7  wherein the sodium phosphate is in the form of the dodecahydrate. 
     
     
         9 . The process of  claim 1  wherein the mixture comprises from about 0.5 to about 50% by weight of a saccharide on a water-free basis. 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . (canceled) 
     
     
         14 . (canceled) 
     
     
         15 . The process of  claim 1  wherein in (a) sufficient water to make an extrudable paste is added to a solid composition comprising from 2 to 90% by weight on a water-free basis of one or more active ingredients comprising a sulfonamide herbicide free acid component, from 0.5 to 94% by weight on a water-free basis of a saccharide, from 1 to 20% by weight on a water-free basis of surfactant component, at least about 50 equivalent % of base selected from inorganic base equivalents having conjugate acid pK a s at least 2.1 units greater than the highest pK a  of the sulfonamide herbicide free acid component, and optionally other ingredients; the sum of the weight % of all the ingredients in the solid composition totaling 100% of a water-free basis; and at least 10% of the sulfonamide herbicide content in the solid composition being in free acid form. 
     
     
         16 . The process of  claim 1  further comprising a step of sifting the dried extrudate. 
     
     
         17 . A paste-extruded sulfonamide herbicide composition prepared by the process of  claim 1 . 
     
     
         18 . A paste-extruded sulfonamide herbicide composition obtainable by the process of  claim 1 . 
     
     
         19 . The process of  claim 1  wherein the mixture comprises two or more active ingredients. 
     
     
         20 . The process of  claim 1  wherein the base component comprises a hydrated form of sodium phosphate. 
     
     
         21 . The process of  claim 20  wherein the hydrated form of sodium phosphate is the dodecahydrate. 
     
     
         22 . The process of  claim 1  wherein the mixture further comprises from about 0.5 to about 50% by weight of a disaccharide on a water-free basis. 
     
     
         23 . A mixture comprising:
 (a) from 2 to 90% by weight on a water-free basis of one or more active ingredients comprising a sulfonamide herbicide free acid component consisting of one or more sulfonamide herbicide free acids;   (b) from 0 to 95% by weight on a water-free basis of one or more additives selected from the group consisting of wetting agents, dispersants, lubricants, anticaking agents, chemical stabilizers and diluents; and   (c) at least about 75 equivalent % of base selected from inorganic base equivalents having conjugate acid pK a s at least 2.1 units greater than the highest pK a  of the sulfonamide herbicide free acid component.   wherein the sum of the weight percents of all the ingredients in the mixture totaling 100% on a water-free basis.   
     
     
         24 . The mixture of  claim 23 , wherein the sulfonamide herbicide free acid component comprises nicosulfuron. 
     
     
         25 . The mixture of  claim 23 , wherein the sulfonamide herbicide free acid component comprises rimsulfuron. 
     
     
         26 . The mixture of  claim 23 , wherein the sulfonamide herbicide free acid component comprises tribenuron-methyl. 
     
     
         27 . The mixture of  claim 23 , wherein the sulfonamide herbicide free acid component comprises thifensulfuron-methyl. 
     
     
         28 . The mixture of  claim 23 , further comprising sufficient water to make an extrudable paste.

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