Synergistic Mixtures of O-Phenylphenol and Dazomet

Abstract

Ortho phenylphenol acts synergistically with various other antimicrobial compounds commonly used in industrial applications.

1 . An antimicrobial synergistic mixture of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione and o-phenylphenol wherein the mixture is determined to be antimicrobial synergistic by having a synergistic index of less than 1.  
     
     
         2 . An antimicrobial synergistic mixture as recited in  claim 1  wherein the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:8.  
     
     
         3 . An antimicrobial synergistic mixture as recited in  claim 1  wherein at around a pH of 5.5 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 1:1 to 1:170.  
     
     
         4 . An antimicrobial synergistic mixture as recited in  claim 1  wherein at around a pH of 7.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:8.  
     
     
         5 . An antimicrobial synergistic mixture as recited in  claim 1  wherein at around a pH of 8.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:2.  
     
     
         6 . An antimicrobial synergistic mixture as recited in  claim 1  wherein at around a pH of 8.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is around 4:1.  
     
     
         7 . A method of controlling antimicrobials in cement admixtures and slurries comprising: 
 a. providing a cement admixture; and    b. adding an antimicrobial synergistic mixture of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione and o-phenylphenol wherein the mixture is determined to be antimicrobial synergistic by having a synergistic index of less than 1    
     
     
         8 . A method as recited in  claim 7  wherein the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:8.  
     
     
         9 . A method as recited in  claim 7  wherein at around a pH of 5.5 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 1:1 to 1:170.  
     
     
         10 . A method as recited in  claim 7  wherein at around a pH of 7.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:8.  
     
     
         11 . A method as recited as recited in  claim 7  wherein at around a pH of 8.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is from 8:1 to 1:2.  
     
     
         12 . A method as recited in  claim 7  wherein at around a pH of 8.0 the ratio of tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione to o-phenylphenol is around 4:1.