Patent ID: 8796252
Filing Date: 2014-08-05
Classification: A01N,A61K,A61P,A61Q,C10M,C10N

Abstract:
1. A method for inhibiting the growth of free-living microorganisms or biofilm in a metalworking fluid, comprising the steps of: (A) providing an antimicrobial composition concentrate comprising: (a) from about 1% to about 10% of sodium pyrithione; (b) from about 0.05 to about 3% of a zinc source selected from the group consisting of zinc salts, zinc borates, zinc oxides, zinc hydroxides, zinc sulfates, zinc chlorides, zinc alloys, zinc complexes, and combinations thereof; (c) from about 40% to 70% of alkanolamines selected from the group consisting of ethanolamine, 1-amino-2-propanol, 3-amino-l-propanol, and combinations thereof; (B) incorporating said antimicrobial composition concentrate into a metalworking fluid to to provide a “masterbatch” comprising, fluid, (C) diluting said “masterbatch” to produce an antimicrobially effectively metal working fluid, (D) contacting said free-living microorganisms or biofilm with said antimicrobially effective metalworking fluid, wherein said antimicrobially effective metalworking fluid has an enhanced biocidal effect against free-living microorganisms or biofilms.