Patent ID: 6811711
Filing Date: 2004-11-02
Classification: A01N,C02F

Abstract:
A method for inhibiting the growth of or killing algae, bacteria, yeast, and/or fungi in a recirculating water system comprising adding to the water, (A) a polymeric biguanide, (B) dodecylamine or salt thereof, and (C) a polyquaternary ammonium compound comprising a repeat unit of the formula (7): wherein: R4, R5, R6 and R7 each independently is C1-6-alkyl optionally substituted by hydroxy; Q2âˆ’ is a divalent counter ion, two monovalent counter ions or a fraction of a polyvalent counter ion sufficient to balance the cationic charge in the repeat unit; and a, b and t each independently is 1 to 4 in an amount effective in inhibiting the growth of or killing said algae, bacteria, and/or fungi without affecting water clarity.