Patent ID: 8900641
Filing Date: 2014-12-02
Classification: A01N

Abstract:
1. A method of inhibiting growth of microorganisms in an aqueous system comprising treating the system with an effective inhibiting amount of an antimicrobial composition, the antimicrobial composition comprising one or more ammonium salts and a nonionic dispersant to form an aqueous polymer-ammonium salt dispersion comprising one or more polymers linked to one or more ammonium salts, and mixing the aqueous polymer-ammonium salt dispersion with a chlorine source in a molar ratio of chlorine (as Cl 2 ) to ammonium ion of about 1:10 to about 10:1 relative to the amount of chlorine present after complete conversion of the chlorine source and sufficient alkali to result in a composition which exhibits effective antimicrobial activity in an industrial water system being treated, wherein the aqueous system is a papermaking system and the microorganisms are the sort of microorganisms that infest papermaking systems, wherein the antimicrobial composition is prepared prior to adding to the system, wherein the pH is at least 7 and wherein the polymer-ammonium salt reacts with the converted chlorine such that the resulting composition displays less than 10% oxidant loss and more than 80% of the oxidant persists in a stabilized form for at least 3 minutes.