US2013217575A1PendingUtilityA1

Compositions for treating water systems

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Assignee: ARCH CHEM INCPriority: Aug 24, 2009Filed: Apr 11, 2013Published: Aug 22, 2013
Est. expiryAug 24, 2029(~3.1 yrs left)· nominal 20-yr term from priority
Inventors:Michael J. UnhochPatricia A. Brown
A01N 37/00C02F 1/505A01N 59/16A01N 47/44
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Claims

Abstract

The present invention relates to treatment of water, and more specifically to treatment of water using a stable formulation of polyhexamethylene biguanide (PHMB) and a liquid or solid zinc salt for the application and prevention algae in recirculated and stagnant water systems. The invention also encompasses methods of treating water that already contains PHMB.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A composition for treating recirculating or stagnant water, comprising:
 polyhexamethylene biguanide (PHMB); and   one or more zinc salts.   
     
     
         2 . The composition of  claim 1 , wherein said PHMB comprises from 0.1 to 99.9 percent by weight, based on the total weight of said composition. 
     
     
         3 . The composition of  claim 1 , wherein said PHMB comprises from 5 to 98 percent by weight, based on the total weight of said composition. 
     
     
         4 . The composition of  claim 1 , wherein said PHMB comprises from 10 to 90 percent by weight, based on the total weight of said composition. 
     
     
         5 . The composition of  claim 1 , wherein said PHMB is in liquid form and comprises from 1 to 40 percent by weight, based on the total weight of said composition. 
     
     
         6 . The composition of  claim 1 , wherein said zinc salt is selected from the group consisting of zinc sulfate monohydrate (ZnSO 4 H 2 O), zinc sulfate heptahydrate (ZnSO 4 7H 2 O), zinc carbonate (ZnCO 3 ), zinc nitrate (Zn(NO 3 ) 2 ), zinc borate, zinc hydroxide, zinc phosphate, and combinations thereof. 
     
     
         7 . The composition of  claim 1 , wherein said one or more zinc salts comprise from 0.1 to 95 percent by weight, based on the total weight of said composition. 
     
     
         8 . The composition of  claim 1 , wherein said one or more zinc salts comprise from 1 to 30 percent by weight, based on the total weight of said composition. 
     
     
         9 . The composition of  claim 1 , wherein said one or more zinc salts comprise from 2 to 25 percent by weight, based on the total weight of said composition. 
     
     
         10 . The composition of  claim 1 , wherein said zinc salts are in liquid or solution form and comprise up to 10 percent by weight, based on the total weight of said composition.

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